氮氧化物
催化作用
化学
汽油
硫黄
稀烧
颠倒
工作(物理)
废物管理
化学工程
工艺工程
汽车工程
工程类
有机化学
燃烧
机械工程
作者
Calvin R. Thomas,Josh A. Pihl,Vitaly Y. Prikhodko,James E. Parks,Jochen A. Lauterbach,Todd J. Toops
标识
DOI:10.1016/j.apcata.2022.118771
摘要
Efficient lean-burn gasoline engines cannot employ traditional three-way catalysts (TWCs) to control NOX emissions due to excess oxygen. Passive selective catalytic reduction (pSCR) is a process designed to control NOx by generating NH3 over the TWC during fuel-rich operation, storing it on a downstream SCR, and then converting NOx during fuel-lean operation. This work is focused on studying sulfur effects on this promising strategy. Two hydrothermally-aged commercial catalysts were studied for their effectiveness in the presence of SO2: a Pd-based TWC and a TWC with NOX storage. The sulfated samples were evaluated in a flow reactor under pSCR conditions and with targeted reactions. SO2 inhibited the water gas shift and steam reforming reactions, decreasing (but not eliminating) NH3 production; however, initial activity is recoverable after a simple thermal treatment at 650 °C. This work will prove valuable in understanding, mitigating, and even reversing the effects of SO2 inhibition on real pSCR systems.
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