REACTIVITY OF NH3 OVER (Fe)H-ZSM-5 ZEOLITE: STUDIES OF TEMPERATUREPROGRAMMED AND STEADY-STATE REACTIONS
Introduction The study of NH3 reactivity is of importance for selective catalytic reduction (SCR) of NOx and selective catalytic oxidation (SCO) of NH3. A automobile aftertreatment system combining lean NOx trap (LNT) and SCR catalysts has received attention as one of the promising options to eliminate NOx from lean exhaust. In previous studies, we found that during the rich cycle the primary NOx reduction product over an LNT model catalyst was NH3. A method was established by using a zeolite to capture the rich-cycle generated NH3 and then to convert NOx via NH3-SCR during the lean cycle 1. The role of acidity in NH3- SCR of NO over zeolite has very recently been approached but no clear conclusion has been reached 2,3. To understand the nature of NH3-SCR, this work investigated the release of adsorbed NH3 over HZSM-5 (HZ) and Fe-HZSM-5 (Fe-Z) and the steady-state dynamic reactions of NH3 under different atmospheres.
Xiaoyin Chen Johannes W. Schwank Wei Li
Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA General Motors Global Research and Development, Warren, MI 48090, USA
国际会议
6th International Conference on Environmental Catalysis(第六届国际环境催化大会 ICEC 2010)
北京
英文
19-19
2010-09-12（万方平台首次上网日期，不代表论文的发表时间）