Evaluating The Performance Of Three-way Catalyst In Car Exhaust

Automotive exhaust three-way catalytic converter is one of the most effectiveways to eliminate automobile exhaust pollation in nowdays, the research forthree-way catalytic converter is becoming a hot spot.The paper discussed thestructures of automotive catalytic converters, clariifed the role of the variouscomponents, and discussed the factors of catalytic converter in use. Precious metalcontent directly affect the level of catal’ytic efficiency, so its has an significance meanto do an accurate determination of the active ingredient contentFurthermore, thehousing, the gasket, the main composition and structure of the carrier also have islarge impact on catalytic converter, so develope a set of measurement refer toindicators r becomes very valueable and meaningful.Taking two categories. six catalytic converter as the research object, using SEM.XRD. XRF. surface area analyzers, density meter, direct reading spectrometermethods to characterize the selected material composition, surface morphology,carrier crystalline phase and the density of carriers. All of these form a catalyticconverter technology assessment test.Case studies shown that all catalysts are made of stainless steel. One belongs tomartensitic stainless steel, the rests belong to the austenitic-ferritic stainless steels，All of these case do not contain toxic chemical elements. Direct reading spectrometertest can be an appropriate means for case materia detection, for it’s easy sampleobtained, pretreatment simple，short test time，test results are accurate, comprehensiveelemental analysis.Studies have shown that the main elements of the liner pad are Al. Fe. Ba, toxicchemical elements are not contained. ICP test has a low detection limit, high accuracy,comprehensive of measured elements, it can be an ideal liner elemept detection methods.All studies shown that the carrier are all cordierite ceramic catalyst carriers,surface area, density, pore size, morphology are presented with the use of differentstates.ICP, XRF, SEM-EDS three methods of measuring the catalyst active componentare usedium, By comparing the different results, ICP analysis of platinum, pallad,rhodium has the characteirstic of low detection limit, high accuracy, small standarddeviation and satisfactory result.we concluded that the ICP method is suitable foranalysis. We used a set of self-designed automobile exhaust measurement device,detected the actual catalytic eiffciency respectively at representative site road, suburbroad and motorway, discovered emission behavior of different pollution factors. Andwe got the degree engine displacement and pollutant concentration effected onpollution emissions. Which provides a research tool for automobile exhaust pollutantemission.The testing results showed that the work condition of the vehicle had anobvious implication of pollution emissions. Pollutant concentration played a primaryrole when a car is accelerating or moving at a high constant speed, while enginedisplacement played a main implication when it is decelerating. When moving atmotorway, discharge rate of CO and NOx is impacted mainly by their concentration,and by engine displacement of HC，Catalyst conducted an obvious purification effect.To deal with sampling problems, we used a non-destructive trace samplingtechnique. The technique simultaneously met the demands of adequate samplingamount for testing，little destructiveness，easy and simple to handle, which bring aboutconvenience for our vehicle monitoring.All the testing results in this paper were determined according to nationalstandards or industry standards. We perfected catalytic convetrer quality assessment,which had important practical significance for catalyst supervision and tradeconformity assessment...