Loading and Aging Effects in Exhaust Gas After-Treatment Catalysts with Pt As Active Component

详细信息    查看全文

• 作者：Willi Boll ; Steffen Tischer ; Olaf Deutschmann
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2010
• 出版时间：November 3, 2010
• 年：2010
• 卷：49
• 期：21
• 页码：10303-10310
• 全文大小：361K
• 年卷期：v.49,no.21(November 3, 2010)
• ISSN：1520-5045

文摘

Abatement of pollutant emissions over platinum-containing catalytic converters of lean operated engines is studied. Several close-to-production model catalysts with varying platinum loading and hydrothermal aging procedures are characterized by BET, HR-SEM, HR-TEM, and CO-TPD. Pollutant conversion is numerically investigated in an isothermal flat bed reactor using varying lean exhaust-gas mixtures and temperatures. The performance of the monolithic catalysts is modeled by a two-dimensional flow field description of a single channel coupled with models for washcoat diffusion and multistep reaction mechanisms. An optimizing procedure is presented which allows adaption of kinetic parameters for slightly different catalysts. The catalytic active surface area of the catalyst determined by CO-TPD can serve as parameter to model the varying noble metal loading and consequences of hydrothermal aging without any adaption of the kinetic data included in the reaction mechanism.