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Catalytic converter is an important after treatment device for emission control in automobiles. Conversion rate of harmful exhaust emission gas in catalytic converter and its efficiency is directly related to design factors of converters such as catalyst materials, wash coat material, substrate material, substrate design and other design factors. Amongst all the factors selection of material for catalyst is considered to be the most important as it deals with exhaust molecules to form nontoxic exhaust emission like nitrogen, carbon dioxide, hydrogen and also it can result in reduction of back pressure by design optimization. Various materials have been used as catalyst for catalytic converter which ranges from precious metals like platinum, palladium and rhodium etc. to non-noble metals such as cobalt, zirconium etc. The selection of materials has greater significance in catalytic converter design because of the vast activity in material science. Therefore, the range of material available to engineers are much larger than ever before. To accomplish better performance at lower price requires as more rational process for material selection. This paper deals with the recent material selection methodology by using weighted property index method (WPIM) to select material for catalytic converter. The emission performance of a converter is primarily function of properties of the catalyst. So, in case of selecting catalytic material, there are different parameters that one might consider for catalyst selection. However, in this method five different important catalytic properties are selected as required characteristic which includes valency, density, ionization energy, thermal conductivity, and thermal expansion. They were optimized using WPIM. The results of the present paper on WPIM gives best material selection for converter. The selected material is again optimized by using cost per unit method and result shows best material by considering cost also for catalytic conve https://journalnx.com/journal-article/20150483 |
