标题：The effect of H2O on the H2-SCR of NOxover Pt/HZSM-5
作者：Zhao, Xiaojuan ;Zhang, Xiaoxiao ;Xu, Yongzhen ;Liu, Ye ;Wang, Xinping ;Yu, Qing
作者机构：[Zhao, Xiaojuan ;Zhang, Xiaoxiao ;Xu, Yongzhen ;Liu, Ye ;Wang, Xinping ] Key Lab. of Indust. Ecol. and Environ. Eng., School of Environmental Science 更多
来源：Journal of Molecular Catalysis A: Chemical
摘要：The influence and corresponding mechanism of H2O on catalytic performance of Pt/HZSM-5 in selective catalytic reduction of NOxby hydrogen (H2-SCR) was investigated. Positive effect was detected on H2conversion, whereas divergent effects were observed on NOxconversion. NOxconversion was promoted below 120 °C, while that at high temperature was inhibited by H2O. FTIR study and H2-O2reaction results reveal that H2activation is rate-determining step of H2-SCR, competitive adsorption of NOxwith H2on the active sites (Pt0) is suppressed by H2O. It explains the corresponding enhancement of H2O on the NOxconversion at low temperature. On the other hand, the lack of reductant due to H2combustion is the reason for the decline of NOxconversion at high temperature. H2O suppresses surface nitrous species formation that has the function of inhibiting H2combustion, which explains why NOxconversion at high temperature was decreased with the addition of H2O.
© 2015 Published by Elsevier B.V.