Global Kinetics for Platinum Diesel Oxidation Catalysts

详细信息    查看全文

• 作者：Chaitanya S. Sampara ; Edward J. Bissett ; Matthew Chmielewski ; Dennis Assanis
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2007
• 出版时间：November 21, 2007
• 年：2007
• 卷：46
• 期：24
• 页码：7993 - 8003
• 全文大小：287K
• 年卷期：v.46,no.24(November 21, 2007)
• ISSN：1520-5045

文摘

Global oxidation kinetics for propylene (C₃H₆), CO, H₂, and NO were determined over a platinum (Pt) catalystwith simulated diesel exhaust between 200 and 415 C over wide concentration ranges. An integral reactorwith high space velocity capability (up to 2 million h^-1) was used to generate low and moderate conversiondata for the rate-generation process. First-order concentration dependency for all the reactants involved in theC₃H₆, CO, and H₂ oxidation reactions captured the experimental behavior very well. For the NO-NO₂ reaction,the rate was found to be first order with respect to NO and 0.5 order with respect to O₂. An overall inhibitionterm including only the effects of CO and NO for all the reactions was found to be adequate over the rangeof conditions examined in this study. A simplified 1D reactor code was used to interpret the data and predictexit concentrations. An objective function was defined for the optimization process, which is sensitive tomodel predictions at all conversion levels. An optimization strategy was also developed to systematicallysimplify the form of rate expressions and to generate proper initial guesses for each of the intermediate steps.The final rate forms were compared with light-off curves generated on a full-scale reactor mounted on a 1.7L Isuzu engine at University of Michigan.