催化作用
铂金
ZSM-5型
空间速度
选择性
氢
化学
选择性催化还原
无机化学
沸石
有机化学
作者
Qing Yu,M. Richter,Fanxiao Kong,Landong Li,Guangjun Wu,Naijia Guan
出处
期刊:Catalysis Today
[Elsevier]
日期:2010-12-01
卷期号:158 (3-4): 452-458
被引量:44
标识
DOI:10.1016/j.cattod.2010.06.031
摘要
The catalytic performances of platinum catalysts supported on ZSM-5, ZSM-35 and Beta are explored for the selective catalytic reduction of NO by hydrogen (H2-SCR). 1%Pt/ZSM-35 sample exhibits the best activity and a maximum NO conversion of 80.8% can be achieved at 120 °C with N2 selectivity of 68.5% (GHSV = 80,000/h). In situ FTIR spectra are employed to get insight into the type of surface species formed during reaction, and NH4+ is found to be the key intermediate in H2-SCR. Effects of platinum loadings on the activity of Pt/ZSM-35 are further studied between 0.1 and 2.0 wt.% Pt loading. Increase of Pt loading beyond 1.0 wt.% leads to an activity decline where a loss of strong acid sites is observed. Meanwhile, XRD and TEM results illustrate an aggregation of Pt species with increasing Pt loading on ZSM-35.
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