History and overview: Catalytic converter

History and overview catalytic substituteorA catalytic converter (colloqui all toldy, cat or catcon) is a device utilise to decrease the toxicity of emissions from an internal conflagration engine. A catalytic converter works by using a accelerator to stimulate a chemical reaction in which toxic by- produces of combustion be converted to less-toxic substances.First widely introduced on series-production automobiles in the U.S. grocery for the 1975 model twelvemonth to comply with tightening EPA regulations on auto squirt, catalytic converters are still most(prenominal) unremarkably used in repulse vehicle oust systems. Catalytic converters are also used on generator sets, forklifts, mining equipment, trucks, buses, trains, airplanes and separate engine-equipped machines.HistoryThe catalytic converter was invented by Eugene Houdry, a French mechanical take and expert in catalytic oil refining1 who lived in the United States. Around 1950, when the results of early studi es of smog in Los Angeles were published, Houdry became concerned about the role of automobile rout out in air pollution and founded a special company, Oxy-Catalyst, to develop catalytic converters for grease-gunoline engines an idea ahead of its time for which he was awarded a patent (US2742437). general adoption had to wait until the extremely effective anti-knock agent tetraHYPERLINK http//en.wikipedia.org/wiki/Tetra-ethyl_lead-HYPERLINK http//en.wikipedia.org/wiki/Tetra-ethyl_leadethylHYPERLINK http//en.wikipedia.org/wiki/Tetra-ethyl_lead HYPERLINK http//en.wikipedia.org/wiki/Tetra-ethyl_leadlead was eliminated from most gasoline over environmental concerns, as the agent would foul the converter by forming a coating on the particle accelerators stand up, effectively disabling it.2The catalytic converter was further developed by JohnHYPERLINK http//en.wikipedia.org/wiki/John_J._Mo unityy J. HYPERLINK http//en.wikipedia.org/wiki/John_J._Mo unrivaledyMooney and CarlHYPERLINK http//en.wikipedia.org/wiki/Carl_D._Keith D. HYPERLINK http//en.wikipedia.org/wiki/Carl_D._KeithKeith at the Engel cloggyHYPERLINK http//en.wikipedia.org/wiki/Engelhard_Corpo dimensionn HYPERLINK http//en.wikipedia.org/wiki/Engelhard_CorporationCorporation,3 creating the first production catalytic converter .Metal-core converterCeramic-core converterThe catalytic converter consists of several componentsThe core, or substrate. The core is often a ceramic honeycomb in modern catalytic converters, but stainlessHYPERLINK http//en.wikipedia.org/wiki/Stainless_steel HYPERLINK http//en.wikipedia.org/wiki/Stainless_steelsteel transparentness honeycombs are also used. The honey-comb surface increases the amount of surface area available to support the catalyst, and therefore is often called a catalystHYPERLINK http//en.wikipedia.org/wiki/Catalyst_support HYPERLINK http//en.wikipedia.org/wiki/Catalyst_supportsupport. The ceramic substrate was invented by RodneyHYPERLINK http//en.wikipedia.o rg/wiki/Rodney_Bagley HYPERLINK http//en.wikipedia.org/wiki/Rodney_BagleyBagley, IrwinHYPERLINK http//en.wikipedia.org/wiki/Irwin_Lachman HYPERLINK http//en.wikipedia.org/wiki/Irwin_LachmanLachman and RonaldHYPERLINK http//en.wikipedia.org/w/index.php?title=Ronald_Lewis_(scientist)action=editredlink=1 HYPERLINK http//en.wikipedia.org/w/index.php?title=Ronald_Lewis_(scientist)action=editredlink=1Lewis at CorningHYPERLINK http//en.wikipedia.org/wiki/Corning_Glass HYPERLINK http//en.wikipedia.org/wiki/Corning_GlassGlass, for which they were inducted into the themeHYPERLINK http//en.wikipedia.org/wiki/National_Inventors_Hall_of_Fame HYPERLINK http//en.wikipedia.org/wiki/National_Inventors_Hall_of_FameInventorsHYPERLINK http//en.wikipedia.org/wiki/National_Inventors_Hall_of_Fame HYPERLINK http//en.wikipedia.org/wiki/National_Inventors_Hall_of_FameHallHYPERLINK http//en.wikipedia.org/wiki/National_Inventors_Hall_of_Fame of HYPERLINK http//en.wikipedia.org/wiki/National_Inventors_Hall_of_F ameFame in 2002.The washcoat. A washcoat is used to make converters more efficient, often as a admixture of silicon oxide and alumina. The washcoat, when hited to the core, forms a rough, irregular surface, which has a far greater surface area than the flat core surfaces do, which then gives the converter core a titanicr surface area, and therefore more places for active valued metal sites. The catalyst is added to the washcoat (in suspension) before being applied to the core.The catalyst itself is most often a precious metal. platinum is the most active catalyst and is widely used. It is not suitable for all applications, however, because of unwanted additional reactions and/or cost. Palladium and rhodium are both opposite precious metals used. Platinum and rhodium are used as a reduction catalyst, dapple platinum and palladium are used as an oxidization catalyst. Cerium, iron, manganese and nickel are also used, although each has its own limitations. Nickel is not sub j udice for use in the European Union (due to reaction with one C monoxide). Copper stomach be used everywhere except North America, where its use is illegal due to the formation of dioxin.How Catalytic Converters WorkJames L. Amos/National Geographic/Getty ImagesA large pile of platinum lined catalytic converters. See more green living pictures.There are millions of cars on the alley in the United States, and each one is a source of air pollution. Especially in large cities, the amount of pollution that all the cars produce unneurotic can create well-favored problems.To solve those problems, cities, states and the federal government create clean-air laws that restrict the amount of pollution that cars can produce. Over the years, automakers have made more refinements to car engines and fuel systems to discover up with these laws. One of these variety shows came about in 1975 with an interesting device called a catalytic converter. The job of the catalytic converter is to conv ert harmful pollutants into less harmful emissions before they ever leave the cars exhaust system.Catalytic converters are amazingly simple devices, so it is incredible to see how big an impact they have. In this article, you will learn which pollutants are produced by an engine and how a catalytic converter deals with each of these pollutants to dish up reduceedit Typesedit Two-wayA two-way catalytic converter has two simultaneous tasksOxidation of carbon monoxide to carbon dioxide 2CO + O2 2CO2Oxidation of unburnt hydrocarbons (unburnt and partially-burnt fuel) to carbon dioxide and water CxH2x+2 + (3x+1)/2 O2 xCO2 + (x+1) H2O (a combustion reaction)This face of catalytic converter is widely used on diesel engine engines to reduce hydrocarbon and carbon monoxide emissions. They were also used on gasoline engines in USA market automobiles until 1981. Due to their inability to view nitrous oxide NOHYPERLINK http//en.wikipedia.org/wiki/nighttimex, they were superseded by lead-w ay converters.edit Three-waySince 1981, three-way catalytic converters have been used in vehicle emission control systems in North America and many other countries on roadgoing vehicles. A three-way catalytic converter has three simultaneous tasksReduction of northward oxides to nitrogen and atomic number 8 2NOx xO2 + N2Oxidation of carbon monoxide to carbon dioxide 2CO + O2 2CO2Oxidation of unburnt hydrocarbons (HC) to carbon dioxide and water CxH2x+2 + (3x+1)/2O2 xCO2 + (x+1)H2OThese three reactions evanesce most efficiently when the catalytic converter receives exhaust from an engine directning slightly above the stoichiometric point. This point is between 14.6 and 14.8 parts air to 1 part fuel, by weight, for gasoline. The ratio for LPG, natural gas and ethanol fuels is slightly different, requiring modified fuel system settings when using those fuels. Generally, engines fitted with 3-way catalytic converters are equipped with a computerized closed-loop feedback fuel injec tion system using one or more oxygen sensors, though early in the deployment of 3-way converters, carburetors equipped for feedback mixture control were used. While a 3-way catalyst can be used in an open-loop system, NOx reduction efficiency is low. Within a narrow fuel/air ratio band surrounding stoichiometry, conversion of all three pollutants is nearly complete. However, outside that band, conversion efficiency falls very rapidly. When there is more oxygen than required, the system is said to be running lean, and the system is in oxidizing condition. In that case, the converters two oxidizing reactions (oxidation of CO and hydrocarbons) are favoured, at the expense of the reduction of NOx. When there is excessive fuel, the engine is running rich the reduction of NOx is favoured, at the expense of CO and HC oxidation.edit Oxygen storageThree-way catalytic converters can store oxygen from the exhaust gas stream, usually when the air fuel ratio goes lean.5 When insufficient oxygen is available from the exhaust stream, the stored oxygen is released and consumed (see cerium(IV) oxide). This lean-ness occurs either when oxygen derived from NOx reduction is unavailable or certain maneuvers such as hard acceleration enrich the mixture beyond the ability of the converter to supply oxygen.edit Unwanted reactionsUnwanted reactions can occur in the three-way catalyst, such as the formation of odiferous hydrogen sulfide and ammonia. Formation of each can be limited by modifications to the washcoat and precious metals used. It is difficult to eliminate these byproducts entirely. Sulfur-free or low-sulfur fuels eliminate or reduce hydrogen sulfide.For example, when control of hydrogen sulfide emissions is desired, nickel or manganese is added to the washcoat. Both substances act to block the adsorption of sulfur by the washcoat. hydrogen sulfide is formed when the washcoat has adsorbed sulfur during a low temperature part of the operating cycle, which is then released d uring the high temperature part of the cycle and the sulfur combines with HC.edit For diesel enginesFor compression-ignition (i.e., diesel) engines, the most car parkly used catalytic converter is the diesel oxidation catalyst. This catalyst uses O2 (oxygen) in the exhaust gas stream to convert CO (carbon monoxide) to CO2 (carbon dioxide) and HC (hydrocarbons) to H2O (water) and CO2. These converters often locomote at 90% efficiency, virtually eliminating diesel odor and helping to reduce visible particulates (soot). But they cannot reduce NOx because chemical reactions always occur in the simplest possible way, and the existing O2 in the exhaust gas stream would react first.To reduce NOx on a compression ignition engine, the chemical composition of the exhaust must first be changed. Two main techniques are used exhaust gas recirculation (EGR) and selective catalytic reduction (SCR). NOx trapping (with NOx absorbers) is a third method, but as of yet (2010), is not widely used.Die sel engine exhaust contains relatively high levels of particulate matter (soot), consisting in large part of elemental carbon. Catalytic converters cannot clean up elemental carbon, though they do channelise up to 90% of the dissoluble organic fractioncitation needed, so particulates are cleaned up by a soot trap or diesel particulate filter (DPF). In the United States, all on-road heavy-duty vehicles powered by diesel and built after 1 January 2007 must be equipped with a catalytic converter and a diesel particulate filter.6Instead of catalysis, a reagent such as ammonia pyrolyzed in situ from urea, is sometimes used to reduce the NOx into nitrogen. One trademark product to do this is AdBlue.edit For lean-burn enginesFor lean burn spark ignition engines, an oxidation catalyst is used in the same manner as in a diesel engine.edit generalisationMany vehicles have a pre-catalyst located close to the engines exhaust manifold. This unit heats up quickly due to its proximity to the en gine, and reduces cold-engine emissions by burning off hydrocarbons from the extra-rich mixture used in a cold engine.Many three-way catalytic converters utilize an air injection tube between the first (NOx reduction) and second (HC and CO oxidation) stages of the converter. This tube is fed by a secondary air injection system. The injected air provides oxygen for the catalysts oxidizing reaction. These systems also sometimes include an upstream air injector to require oxygen to the exhaust system before it reaches the catalytic converter. This precleans the extra-rich exhaust from a cold engine, and helps bring the catalytic converter quickly up to operating temperature. nearly newer systems do not employ air injection. Instead, they provide a constantly varying mixture that quickly and continually cycles between lean and rich to keep the first catalyst (NOx reduction) from becoming oxygen loaded, and to keep the second catalyst (CO oxidization) sufficiently oxygen-saturated. They also utilize several oxygen sensors to monitor the exhaust, at least one before the catalytic converter for each bank of cylinders, and one after the converter. Some systems contain the reduction and oxidation functions separately rather than in a common housing.edit Damageedit PoisoningCatalyst poisoning occurs when the catalytic converter is exposed to exhaust containing substances that coat the working surfaces, encapsulating the catalyst so that it cannot get through and treat the exhaust. The most notable contaminant is lead, so vehicles equipped with catalytic converters can only be run on unleaded gasoline. Other common catalyst poisons include manganese primarily from the gasoline additive MMT, and silicone which can enter the exhaust stream if the engine has a leak allowing coolant into the combustion chamber. Phosphorus is another catalyst contaminant. Although phosphorus is no longer used in gasoline, it (and zinc, another low-level catalyst contaminant) was until recen tly widely used in engine oil antiwear additives such as ZDDP. Beginning in 2006, a rapid phaseout of ZDDP in engine oils began.citation neededDepending on the contaminant, catalyst poisoning can sometimes be reversed by running the engine low a very heavy load for an extended period of time. The increased exhaust temperature can sometimes liquefy or sublimate the contaminant, removing it from the catalytic surface. However, remotion of lead deposits in this manner is usually not possible due to leads high boil point.edit MeltdownAny condition that causes abnormally high levels of unburned hydrocarbons raw or partially-burnt fuel to reach the converter will tend to significantly elevate its temperature, take the risk of a meltdown of the substrate and resultant catalytic deactivation and severe exhaust restriction. Vehicles equipped with OBD-II diagnostic systems are designed to alert the driver of a misfire condition, along with other malfunctions, by means of the Check Engin e light on the dashboard.edit RegulationsThis section does not citeany references or sources.Please help improve this articleby adding citations to reliable sources. Unsourced material may be challengedand removed. (March 2009)Emissions regulations vary considerably from jurisdiction to jurisdiction. In North America, most spark ignition engines of over 25 brake horsepower (19 kW) output built after January 1, 2004 are equipped with three-way catalytic converters. In Japan, a similar set of regulations came into effect January 1, 2007, while the European Union has not yet enacted analogous regulations. Most automobile spark ignition engines in North America have been fitted with catalytic converters since the mid-1970s, and the engineering science used in non-automotive applications is generally based on automotive technology.Regulations for diesel engines are similarly varied, with some jurisdictions snap on NOx (nitric oxide and nitrogen dioxide) emissions and others focusing on particulate (soot) emissions. The regulatory diversity is challenging for manufacturers of the engine as it may not be economical to design an engine to meet two sets of regulations.Regulations of fuel quality vary across jurisdictions. In North America, Europe, Japan, and Hong Kong, gasoline and diesel fuel are highly regulated, and CNG and LPG are being reviewed for regulation. In most of Asia and Africa, the regulations are often lax in some places sulfur content of the fuel can reach 20,000 parts per million (2%). Any sulfur in the fuel can be change to SO2 (sulfur dioxide) or even SO3 (sulfur trioxide) in the combustion chamber. If sulfur passes over a catalyst, it may be further oxidized in the catalyst, i.e. (SO2 may be further oxidized to SO3). Sulfur oxides are precursors to sulfuric acid, a major component of acid rain. While it is possible to add substances like vanadium to the catalyst wash coat to combat sulfur oxide formation, such addition will reduce the effective ness of the catalyst. The most effective closure is to further refine fuel at the refinery to produce ultra-low sulfur diesel. Regulations in Japan, Europe, and North America tightly restrict the amount of sulfur permitted in motor fuels. However, the expense of producing such clean fuel make it impractical for use in many developing countries. As a result, cities in these countries with high levels of vehicular traffic suffer from acid rain, which damages stone and woodwork of buildings and damages local ecosystems.edit Negative aspectsSome early converter designs greatly restricted the hang up of exhaust, which negatively affected vehicle performance, driveability, and fuel economy.7 Because they were used with carburetors incapable of precise fuel/air mixture control, they could overheat and set fire to flammable materials under the car.8 Removing a modern catalytic converter in new condition will only slightly increase vehicle performance without retuning,9 but their removal o r gutting continues.7HYPERLINK http//en.wikipedia.org/wiki/Catalytic_convertercite_note-910 The exhaust section where the converter was may be replaced with a welded-in section of straight pipe, or a flanged section of test pipe legal for off-road use that can then be replaced with a similarly fitted converter-choked section for legal on-road use, or emissions testing.9 In the US and many other jurisdictions, it is illegal to remove or disable a catalytic converter for any reason other than its immediate replacementcitation needed vehicles without functioning catalytic converters generally fail emission inspections. The aftermarket supplies high-flow converters for vehicles with upgraded engines, or whose owners prefer an exhaust system with larger-than-stock capacity.11edit Warm-up periodMost of the pollution put out by a car occurs during the first five transactions before the catalytic converter has warmed up sufficiently.12edit Environmental impactCatalytic converters have prov en to be reliable and effective in reducing noxious tailpipe emissions. However, they may have some adverse environmental impacts in useThe requirement for a rich burn engine to run at the stoichiometric point means it uses more fuel than a lean burn engine running at a mixture of 201 or less. This increases the amount of fossil fuel consumed and the carbon dioxide emissions of the vehicle. However, NOx control on lean burn engines is problematic.Although catalytic converters are effective at removing hydrocarbons and other harmful emissions, they do not solve the fundamental problem created by burning a fossil fuel. In addition to water, the main combustion product in exhaust gas leaving the engine through a catalytic converter or not is carbon dioxide (CO2).13 Carbon dioxide produced from fossil fuels is one of the greenhouse gases indicated by the Intergovernmental Panel on Climate Change (IPCC) to be a most likely cause of global warming.14 Additionally, the U.S. Environmenta l Protection commission (EPA) has stated catalytic converters are a significant and growing cause of global warming, due to their release of nitrous oxide (N2O), a greenhouse gas over 300 times more potent than carbon dioxide.15Catalytic converter production requires palladium or platinum part of the world supply of these precious metals is produced near the Russian city of Norilsk, where the industry (among others) has caused Norilsk to be added to Time Magazines list of most polluted places.16edit TheftDue to the external location and the use of priceless precious metals including platinum, palladium, and rhodium, converters are a target for thieves. The problem is especially common among late-model Toyota trucks and SUVs, due to their high ground clearance and easily-removed bolt-on catalytic converters. Welded-in converters are also at risk of theft from SUVs and trucks, as they can be easily removed.17HYPERLINK http//en.wikipedia.org/wiki/Catalytic_convertercite_note-1718 The ft removal of the converter can often inadvertently damage the cars wiring or fuel line resulting in dangerous consequences. Rises in metal costs in the United States during recent years have led to a large increase in theft incidents of the converter,19 which can then cost as much as $1000 to replace.20edit DiagnosticsVarious jurisdictions now legislate on-board nosology to monitor the function and condition of the emissions control system, including the catalytic converter. On-board diagnostic systems take several forms.edit Temperature sensorsTemperature sensors are used for two purposes. The first is as a ensample system, typically on 2-Way catalytic converters such as are still sometimes used on LPG forklifts. The function of the sensor is to warn of catalytic converter temperature above the safe limit of 750 C (1,380 F). More recent catalytic converter designs are not as susceptible to temperature damage and can detain sustained temperatures of 900 C (1,650 F).citation need ed Temperature sensors are also used to monitor catalyst functioning usually two sensors will be fitted, with one before the catalyst and one after to monitor the temperature rise over the catalytic converter core. For every 1% of CO in the exhaust gas stream the exhaust gas temperature will rise by 100C.citation needededit Oxygen sensorsThe Oxygen sensor is the basis of the closed loop control system on a spark ignited rich burn engine, however it is also used for diagnostics. In vehicles with OBD II, a second oxygen sensor is fitted after the catalytic converter to monitor the O2 levels. The on-board computer makes comparisons between the readings of the two sensors. If both sensors give the same output, the computer recognizes the catalytic converter is not functioning or removed, and will operate a check engine light and retard engine performance. Simple oxygen sensor simulators have been developed to circumvent this problem by simulating the change across the catalytic convert er with plans and pre-assembled devices available on the internet, though these are not legal for on-road use.21 Similar devices apply an offset to the sensor signals, allowing the engine to run a more fuel economical lean burn that may however damage the engine or the catalytic converter.22edit NOx sensorsNOx sensors are extremely expensive and are generally only used when a compression ignition engine is fitted with a selective catalytic reduction (SCR) converter, or a NOx absorber catalyst in a feedback system. When fitted to an SCR system, there may be one or two sensors. When one sensor is fitted it will be pre-catalyst, when two are fitted the second one will be post catalyst. They are utilized for the same reasons and in the same manner as an oxygen sensor the only difference is the substance being monitored.