What%27s in catalytic converters - However, when it comes to catalytic converter thefts, thieves spare no one. The mechanics we spoke to said the most targeted cars for catalytic converter thefts are “regular” cars that common folk drive. Between January and May 2021, car thieves stole almost 26,000 catalytic converters in the United States. This equates to 5200 thefts a month!

 
The type of catalytic converter a car has may depend on: The car’s size. Whether it’s a hybrid (hybrid engines don’t run as hot, which affects how the catalytic converter operates) Where the catalytic converter is located. The catalysts used. Whether the converter is approved in California .... Sands healthcare strategies

A new catalytic converter costs anywhere from $600 to $2,500. Keep in mind that some vehicles have more than one converter, which would increase the overall cost. If you’re looking to save some cash, you can consider purchasing a catalytic converter from a scrap yard. Prices on catalytic converters: Source. Price Range.A catalytic converter uses a set of catalysts to convert some of the dangerous gases produced by your car into benign substances. There are three primary metals that are used inside of converters as well as other materials. Feb 15, 2023 · That said, replacing a catalytic converter can cost anywhere between a few hundred dollars to well over two thousand. The average cost is typically between $900 and $2,500, depending on the situation. It’s best to visit multiple well-respected mechanics and get several estimates to find the best price in your area. Last year alone, more than 14,000 were stolen from cars and trucks. That's in part because of soaring prices for some valuable metals inside the converters. The price of rhodium, for instance, has ...A catalytic converter is a device that uses a catalyst to convert three harmful compounds in car exhaust into harmless compounds. Nitrogen oxides (created when the heat in the engine forces nitrogen in the air to combine with oxygen) Carbon monoxide is a poison for any air-breathing animal. Nitrogen oxides lead to smog and acid rain, and ...Catalytic converters are a key component of your car’s exhaust system. Their purpose is to turn the dangerous pollutants that are produced in your car’s engine into benign compounds. The ultimate goal of this auto part is to decrease the environmental harm caused by vehicle emissions.Aug 13, 2020 · Two-way catalytic converters do a poor job of reducing NOx (nitrogen oxides), which led to the development of three-way plus air converters. In addition to the two oxidation catalysts, they add a third chemical process: a reduction catalyst that converts NOx into N2 (nitrogen) and O2 (oxygen). Most vehicles built since the early 1980s use three ... A catalytic converter is a large metal box, bolted to the underside of your car, that has two pipes coming out of it. One of them (the converter's "input") is connected to the engine and brings in hot, polluted fumes from the engine's cylinders (where the fuel burns and produces power).CARB Compliant Catalytic Converters. Shop By Vehicle. Filter - 201 Products. Sort By Featured. FILTERS. Clear Filters. Part Type. Catalytic Converter. Catalytic Converter with Integrated Exhaust Manifold. Mar 3, 2021 · According to data from 2020, the most expensive catalytic converter belonged to the Ferrari F430, with a mind-popping $3,770.00 price tag. Moreover, the F430 needed two of them, so a full replacement would run car owners $7,540 before labor costs. While the Lamborghini Aventador’s converter is technically the third most expensive, at $3,120 ... Catalytic converters are a vital component of a car’s exhaust or emissions system, reducing the pollutants entering the atmosphere. The metal catalyst neutralizes harmful gases like hydrocarbons, carbon monoxide, and nitrogen oxides, turning them into water vapor and carbon dioxide. Catalytic converters have been mandated in the U.S. since 1975.A catalytic converter is a device that uses a catalyst to convert three harmful compounds in car exhaust into harmless compounds. Nitrogen oxides (created when the heat in the engine forces nitrogen in the air to combine with oxygen) Carbon monoxide is a poison for any air-breathing animal. Nitrogen oxides lead to smog and acid rain, and ...A catalytic converter is a device that uses a catalyst to convert three harmful compounds in car exhaust into harmless compounds. Nitrogen oxides (created when the heat in the engine forces nitrogen in the air to combine with oxygen) Carbon monoxide is a poison for any air-breathing animal. Nitrogen oxides lead to smog and acid rain, and ...Feb 13, 2022 · A catalytic converter is part of your car’s exhaust system that converts harmful engine-exhaust pollutants into something less harmful to the environment. A catalytic converter is part of your... Catalytic converters have been in widespread use in North American vehicles since the 1970s. Their purpose is to make car exhaust from internal combustion engines less toxic, converting substances ...What’s The Difference Between A CARB Compliant Catalytic Converter And A Regular Catalytic Converter? Catalytic converters of any description are good news for the environment. Gas powered vehicles emit a lot of greenhouse gasses that are dangerous for our environment, and the catalytic converters found in such vehicles work to reduce this ... Catalytic converters are your car’s way of filtering out harmful engine exhaust pollutants. This exhaust system converts pollutants (hydrocarbons, carbon monoxide and nitrogen oxides) into ...A catalytic converter is a device that uses a catalyst to convert three harmful compounds in car exhaust into harmless compounds. Nitrogen oxides (created when the heat in the engine forces nitrogen in the air to combine with oxygen) Carbon monoxide is a poison for any air-breathing animal. Nitrogen oxides lead to smog and acid rain, and ...3. Toyota Prius. Toyota. The Toyota Prius is especially attractive when it comes to catalytic converter theft. This is partly due to the fact its gasoline-electric hybrid powertrain’s internal ...What’s slowing the catalytic converter crime wave? Stolen catalytic converters aren’t worth as much anymore. The price of palladium has fallen in recent months.Catalytic converters are a key component of your car’s exhaust system. Their purpose is to turn the dangerous pollutants that are produced in your car’s engine into benign compounds. The ultimate goal of this auto part is to decrease the environmental harm caused by vehicle emissions.Aug 17, 2022 · There are 2-7 grams of palladium in a typical catalytic converter. However, the price of palladium fluctuates and so does the value of your catalytic converter. The best way to get an accurate estimate is to take it to a scrap yard and have them weigh it. The average price per gram of palladium is currently $60.85. The upstream (before the catalytic converter) O2 sensor is the primary input to the powertrain control module (PCM) for fuel control. That being said, the PCM often uses the downstream (after the catalytic converter) O2 sensor to fine-tune the air-fuel mixture. So, yes, driving without the catalytic converter can lead to reduced fuel mileage.A catalytic converter makes no use if short distances are run, Like in my town. When he is hot, he cleans well. Problems with a catalytic converter can occur when exhaust-gas is rich in fuel becouse of faulty fuel injection, And/or sensors are broken, it can melt down, and clog exhaust system.May 8, 2021 · Governors Urge Biden To Order 100% Zero-Emission Car Sales By 2035. The organization blames the under-vehicle crime wave on much higher prices for the valuable metals inside catalytic converters ... A catalytic converter is an exhaust emission control device that converts toxic gases and pollutants in exhaust gas from an internal combustion engine into less-toxic pollutants by catalyzing a redox reaction. Apr 6, 2021 · The main purpose of a catalytic converter is to reduce harmful gases. It also helps optimize the vehicle's performance and efficiency. Yes, it is somewhat true that eliminating the cat will notably improve the performance of a car, as there is no scope for exhaust backpressure which is caused because of clogged cat- combs. For catalytic converters, the repair order showing when the repair involving the catalytic converter was removed and that vehicle’s identification number For those not authorized to repair catalytic converters, a receipt from a person or company that repairs, overhauls, dismantles, or works on motor vehiclesJust the words "catalytic converter theft" can make car owners shudder. It's a highly inconvenient issue that's on the rise due to the valuable metals within these critical emissions-control devices.However, when it comes to catalytic converter thefts, thieves spare no one. The mechanics we spoke to said the most targeted cars for catalytic converter thefts are “regular” cars that common folk drive. Between January and May 2021, car thieves stole almost 26,000 catalytic converters in the United States. This equates to 5200 thefts a month!A new catalytic converter costs anywhere from $600 to $2,500. Keep in mind that some vehicles have more than one converter, which would increase the overall cost. If you’re looking to save some cash, you can consider purchasing a catalytic converter from a scrap yard. Prices on catalytic converters: Source. Price Range.Catalytic converters reduce 87% of hydrocarbon emissions, 85% carbon monoxide & 62% nitrous oxide throughout the expected car life. The catalytic converter is an essential device in gas-fueled cars. If the car generates emissions, it requires this converter. It reduces harmful emissions from the cars. Feb 2, 2022 · A recycled catalytic converter from a car, stolen or not, can fetch between $150 and $250, but converters from trucks can be worth as much as $1,500. The value is due to the rare metals needed to make the converter work: palladium, rhodium, and platinum. Most of you would probably guess that platinum is the most valuable of the metals. Apr 6, 2021 · The main purpose of a catalytic converter is to reduce harmful gases. It also helps optimize the vehicle's performance and efficiency. Yes, it is somewhat true that eliminating the cat will notably improve the performance of a car, as there is no scope for exhaust backpressure which is caused because of clogged cat- combs. In this article, you’ll learn the following: GM catalytic converter scrap values are usually $80.56 – $312.12. Ford catalytic converter scrap values are usually $47.82 – $911.73. Honda catalytic converter scrap values are usually $72.56 – $453.40. Dodge catalytic converter scrap values are usually $84.12 – $1,125.71.A catalytic converter is responsible for transforming 98% of harmful emissions into less toxic emissions. Note, we say less poisonous and not harmless emissions.A catalytic converter is an exhaust emission control device of your vehicle that is responsible for reducing the amount of pollutants and toxic gases from the exhaust gas. Exhaust gas is the result of the internal ignition of the engine of a vehicle. It contains a lot of pollutants and toxic gases that harm the environment after coming out ...The upstream (before the catalytic converter) O2 sensor is the primary input to the powertrain control module (PCM) for fuel control. That being said, the PCM often uses the downstream (after the catalytic converter) O2 sensor to fine-tune the air-fuel mixture. So, yes, driving without the catalytic converter can lead to reduced fuel mileage.Part of the scare and frustration of catalytic converters is the fact that prices for replacement vary wildly. The main difference in lies within direct-fit vs a universal fit unit. For many vehicles, a muffler shop can easily weld in a universal replacement converter for $2-300.00.For catalytic converters, the repair order showing when the repair involving the catalytic converter was removed and that vehicle’s identification number For those not authorized to repair catalytic converters, a receipt from a person or company that repairs, overhauls, dismantles, or works on motor vehiclesLast year alone, more than 14,000 were stolen from cars and trucks. That's in part because of soaring prices for some valuable metals inside the converters. The price of rhodium, for instance, has ...Catalytic converters have been in widespread use in North American vehicles since the 1970s. Their purpose is to make car exhaust from internal combustion engines less toxic, converting substances ...A catalytic converter makes no use if short distances are run, Like in my town. When he is hot, he cleans well. Problems with a catalytic converter can occur when exhaust-gas is rich in fuel becouse of faulty fuel injection, And/or sensors are broken, it can melt down, and clog exhaust system.Aug 13, 2020 · Two-way catalytic converters do a poor job of reducing NOx (nitrogen oxides), which led to the development of three-way plus air converters. In addition to the two oxidation catalysts, they add a third chemical process: a reduction catalyst that converts NOx into N2 (nitrogen) and O2 (oxygen). Most vehicles built since the early 1980s use three ... National Catalytic Converter Average. Average price for catalytic converters in the US. VIEW METAL DETAILS. $82.02/each. Large Foreign Cat. Larger foreign sized cat. GET QUOTE. VIEW METAL DETAILS. $76-$456/each.Just the words "catalytic converter theft" can make car owners shudder. It's a highly inconvenient issue that's on the rise due to the valuable metals within these critical emissions-control devices.The type of catalytic converter a car has may depend on: The car’s size. Whether it’s a hybrid (hybrid engines don’t run as hot, which affects how the catalytic converter operates) Where the catalytic converter is located. The catalysts used. Whether the converter is approved in California ...The type of catalytic converter a car has may depend on: The car’s size. Whether it’s a hybrid (hybrid engines don’t run as hot, which affects how the catalytic converter operates) Where the catalytic converter is located. The catalysts used. Whether the converter is approved in California ...Catalytic converters have been in widespread use in North American vehicles since the 1970s. Their purpose is to make car exhaust from internal combustion engines less toxic, converting substances ...Nov 4, 2022 · A theft ring that allegedly made millions from catalytic converters has been busted. And, crucially, their location on the exterior of a car's underside makes them easy to steal, David Glawe of ... What’s slowing the catalytic converter crime wave? Stolen catalytic converters aren’t worth as much anymore. The price of palladium has fallen in recent months.A catalytic converter is an exhaust emission control device of your vehicle that is responsible for reducing the amount of pollutants and toxic gases from the exhaust gas. Exhaust gas is the result of the internal ignition of the engine of a vehicle. It contains a lot of pollutants and toxic gases that harm the environment after coming out ...Aug 13, 2016 · A catalytic converter makes no use if short distances are run, Like in my town. When he is hot, he cleans well. Problems with a catalytic converter can occur when exhaust-gas is rich in fuel becouse of faulty fuel injection, And/or sensors are broken, it can melt down, and clog exhaust system. May 27, 2023 · Simply search by make, model, or serial number to get an estimate of its worth. Ecotrade Group has an app called Eco Cat that provides access to over 20,000 scrap catalytic converter codes with prices and pictures. You can use this tool to quickly look up the value of your converter and get a quote from a buyer. The type of catalytic converter a car has may depend on: The car’s size. Whether it’s a hybrid (hybrid engines don’t run as hot, which affects how the catalytic converter operates) Where the catalytic converter is located. The catalysts used. Whether the converter is approved in California ...Jul 20, 2023 · Newer models like Honda’s 2015 Accord or Jazz have their catalytic converter inside the engine compartment, making it harder for them to be stolen by thieves. The catalytic converters on Cars like Ford, Chevrolet, Jeep, Dodge, Mazda, Nissan, Subaru, Hyundai, and Chrysler are less likely to be stolen because of the value of the precious metals ... How Many Catalytic Converters Were Stolen in 2022? As Many As 153,000 Catalytic converter theft has been a serious threat to car owners for years, but it turns out there have been far more incidents than previously reported, new Carfax data shows – as many as 153,000 in the U.S. in 2022.Catalytic converters are a vital component of a car’s exhaust or emissions system, reducing the pollutants entering the atmosphere. The metal catalyst neutralizes harmful gases like hydrocarbons, carbon monoxide, and nitrogen oxides, turning them into water vapor and carbon dioxide. Catalytic converters have been mandated in the U.S. since 1975.Catalytic converters are your car’s way of filtering out harmful engine exhaust pollutants. This exhaust system converts pollutants (hydrocarbons, carbon monoxide and nitrogen oxides) into ...Aug 4, 2023 · 2011-17. Chrysler 200. 2001-21. Toyota Prius. These are just the models that most commonly get their catalytic converters stolen. Your vehicle could also be at risk for catalytic converter theft based on a few other factors. Here’s an idea of which types of vehicles are even more at-risk for catalytic converter theft: However, when it comes to catalytic converter thefts, thieves spare no one. The mechanics we spoke to said the most targeted cars for catalytic converter thefts are “regular” cars that common folk drive. Between January and May 2021, car thieves stole almost 26,000 catalytic converters in the United States. This equates to 5200 thefts a month!Feb 2, 2022 · A recycled catalytic converter from a car, stolen or not, can fetch between $150 and $250, but converters from trucks can be worth as much as $1,500. The value is due to the rare metals needed to make the converter work: palladium, rhodium, and platinum. Most of you would probably guess that platinum is the most valuable of the metals. Feb 15, 2023 · That said, replacing a catalytic converter can cost anywhere between a few hundred dollars to well over two thousand. The average cost is typically between $900 and $2,500, depending on the situation. It’s best to visit multiple well-respected mechanics and get several estimates to find the best price in your area. A catalytic converter typically has around 13 ounces of tungsten, making up about 90% of its weight and worth around 40$ on the market. The rest includes some copper, lead and nickel – all with lesser amounts exceeding two pounds each. Platinum accounts for about 0.03% of catalytic converter weight and is worth around 38 $ per gram. The upstream (before the catalytic converter) O2 sensor is the primary input to the powertrain control module (PCM) for fuel control. That being said, the PCM often uses the downstream (after the catalytic converter) O2 sensor to fine-tune the air-fuel mixture. So, yes, driving without the catalytic converter can lead to reduced fuel mileage.Watch a Catalytic Converter in Action. In Wichita, Kansas, thieves stole "more than 500" catalytic converters in 2020 as compared to "fewer than 200" in 2019, according to KAKE ABC. Thieves in ...May 21, 2021 · Recyclers will pay between $50 and $250 for a catalytic converter, according to the NICB. The metals can be sold for even more if lifted from hybrid gas-electric cars like a Prius. "All the newer ... May 27, 2023 · Simply search by make, model, or serial number to get an estimate of its worth. Ecotrade Group has an app called Eco Cat that provides access to over 20,000 scrap catalytic converter codes with prices and pictures. You can use this tool to quickly look up the value of your converter and get a quote from a buyer. Feb 14, 2023 · Catalytic Converters Clean The Air An engine is an inherently unclean machine. It mixes fuel and air, compresses it, ignites it, and uses the explosion from that ignition thousands of times per... What’s The Difference Between A CARB Compliant Catalytic Converter And A Regular Catalytic Converter? Catalytic converters of any description are good news for the environment. Gas powered vehicles emit a lot of greenhouse gasses that are dangerous for our environment, and the catalytic converters found in such vehicles work to reduce this ... Jul 11, 2019 · What year did catalytic converters become mandatory? The average automobile was a toxic chemical factory before catalytic converters became government-mandated equipment in 1972. Oxides of nitrogen and lead, unburned fuel, sulfur dioxide and huge amounts of carbon monoxide poured forth in abundance, polluting groundwater and atmosphere alike. According to data from 2020, the most expensive catalytic converter belonged to the Ferrari F430, with a mind-popping $3,770.00 price tag. Moreover, the F430 needed two of them, so a full replacement would run car owners $7,540 before labor costs. While the Lamborghini Aventador’s converter is technically the third most expensive, at $3,120 ...Apr 28, 2023 · On average, catalytic converter will contain 3 to 7 grams (0.1-0.3 ounces) of platinum. It’s also made of several other materials, such as palladium and rhodium. These materials are worth a lot of money to scrap, even if there are not a lot of them in the catalytic converter. In this guide, I examine how platinum is removed from the catalytic ... The department hopes the combination of license plate numbers etched on converters; a sticker that reads, “This vehicle’s catalytic converter has been etched by the Takoma Park Police Dept ...A recycled catalytic converter from a car, stolen or not, can fetch between $150 and $250, but converters from trucks can be worth as much as $1,500. The value is due to the rare metals needed to make the converter work: palladium, rhodium, and platinum. Most of you would probably guess that platinum is the most valuable of the metals.Aug 4, 2023 · Palladium has a price of $2,049 per ounce or $65 per gram. Platinum has a price of $977 per ounce or $31 per gram. On average, a catalytic converter contains 3-7 grams of platinum, 2-7 grams of palladium, and 1-2 grams of rhodium. Speaking purely in numbers, that’s at least $700 in precious metals alone, but there’s a catch. The historical meaning of its name comes from chemistry, where a catalyst is an accelerator for a reaction. In this case, the catalytic converter receives exhaust gases, a chemical reaction occurs ... Sep 5, 2023 · Catalytic Converters. ( September 7th, 2023, 8:00 am ) Metal/Material. Current Price. National Catalytic Converter Average. Average price for catalytic converters in the US. VIEW METAL DETAILS. $82.02/each. Large Foreign Cat. CARB Compliant Catalytic Converters. Shop By Vehicle. Filter - 201 Products. Sort By Featured. FILTERS. Clear Filters. Part Type. Catalytic Converter. Catalytic Converter with Integrated Exhaust Manifold. For catalytic converters, the repair order showing when the repair involving the catalytic converter was removed and that vehicle’s identification number For those not authorized to repair catalytic converters, a receipt from a person or company that repairs, overhauls, dismantles, or works on motor vehiclesCatalytic converters often last for at least 10 years, or between 70,000 and 100,000 miles. However, it’s possible that the catalytic converter on a car that is used only for short start-stop journeys could wear out faster because the engine and cat won’t be able to reach their optimum operating temperature before being switched off. How Many Catalytic Converters Were Stolen in 2022? As Many As 153,000 Catalytic converter theft has been a serious threat to car owners for years, but it turns out there have been far more incidents than previously reported, new Carfax data shows – as many as 153,000 in the U.S. in 2022.A ‘catalyst’ is a substance that accelerates a chemical reaction, and within a catalytic converter, there are two types of catalyst. The first is a reduction catalyst which uses platinum and ...Catalytic converters reduce 87% of hydrocarbon emissions, 85% carbon monoxide & 62% nitrous oxide throughout the expected car life. The catalytic converter is an essential device in gas-fueled cars. If the car generates emissions, it requires this converter. It reduces harmful emissions from the cars. Oct 26, 2021 · For catalytic converters, the repair order showing when the repair involving the catalytic converter was removed and that vehicle’s identification number; For those not authorized to repair catalytic converters, a receipt from a person or company that repairs, overhauls, dismantles, or works on motor vehicles Catalytic converters play an important role in reducing harmful emissions from vehicles. They work by utilizing chemical reactions to convert pollutants such as carbon monoxide and nitrogen oxide into less harmful substances like water and carbon dioxide. This process is facilitated through the use of metal catalysts that promote and accelerate chemical reactions. In addition, […]

How Many Catalytic Converters Were Stolen in 2022? As Many As 153,000 Catalytic converter theft has been a serious threat to car owners for years, but it turns out there have been far more incidents than previously reported, new Carfax data shows – as many as 153,000 in the U.S. in 2022.. Martinelli

what%27s in catalytic converters

Jul 11, 2019 · What year did catalytic converters become mandatory? The average automobile was a toxic chemical factory before catalytic converters became government-mandated equipment in 1972. Oxides of nitrogen and lead, unburned fuel, sulfur dioxide and huge amounts of carbon monoxide poured forth in abundance, polluting groundwater and atmosphere alike. The type of catalytic converter a car has may depend on: The car’s size. Whether it’s a hybrid (hybrid engines don’t run as hot, which affects how the catalytic converter operates) Where the catalytic converter is located. The catalysts used. Whether the converter is approved in California ...May 27, 2023 · Simply search by make, model, or serial number to get an estimate of its worth. Ecotrade Group has an app called Eco Cat that provides access to over 20,000 scrap catalytic converter codes with prices and pictures. You can use this tool to quickly look up the value of your converter and get a quote from a buyer. Palladium has a price of $2,049 per ounce or $65 per gram. Platinum has a price of $977 per ounce or $31 per gram. On average, a catalytic converter contains 3-7 grams of platinum, 2-7 grams of palladium, and 1-2 grams of rhodium. Speaking purely in numbers, that’s at least $700 in precious metals alone, but there’s a catch.The catalytic converter's construction is as follows: The catalyst support or substrate. For automotive catalytic converters, the core is usually a ceramic monolith that has... The washcoat. A washcoat is a carrier for the catalytic materials and is used to disperse the materials over a large... ...Mar 23, 2022 · According to the Highway Loss Data Institute, “The catalytic converters of hybrids need more of the precious metals to work properly because they don’t get as hot as those installed on conventional vehicles, since the combustion engines of hybrids only run part of the time.” Thieves also look for large pickup trucks and other high-riding ... What’s Inside a Catalytic Converter That Thieves Want? Catalytic converters contain the precious metals rhodium, palladium, and platinum. Together, these elements act as a catalyst—a chemical that starts a reaction without undergoing any change itself.Aug 22, 2023 · Catalytic converters play an important role in reducing harmful emissions from vehicles. They work by utilizing chemical reactions to convert pollutants such as carbon monoxide and nitrogen oxide into less harmful substances like water and carbon dioxide. This process is facilitated through the use of metal catalysts that promote and accelerate chemical reactions. In addition, […] A catalytic converter is a large metal box, bolted to the underside of your car, that has two pipes coming out of it. One of them (the converter's "input") is connected to the engine and brings in hot, polluted fumes from the engine's cylinders (where the fuel burns and produces power).Watch a Catalytic Converter in Action. In Wichita, Kansas, thieves stole "more than 500" catalytic converters in 2020 as compared to "fewer than 200" in 2019, according to KAKE ABC. Thieves in ...Catalytic converters often last for at least 10 years, or between 70,000 and 100,000 miles. However, it’s possible that the catalytic converter on a car that is used only for short start-stop journeys could wear out faster because the engine and cat won’t be able to reach their optimum operating temperature before being switched off. A new catalytic converter costs anywhere from $600 to $2,500. Keep in mind that some vehicles have more than one converter, which would increase the overall cost. If you’re looking to save some cash, you can consider purchasing a catalytic converter from a scrap yard. Prices on catalytic converters: Source. Price Range.What’s Inside a Catalytic Converter That Thieves Want? Catalytic converters contain the precious metals rhodium, palladium, and platinum. Together, these elements act as a catalyst—a chemical that starts a reaction without undergoing any change itself..

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