Selective catalytic reduction of NOx by hydrogen over PtIr/TiO2 catalyst
Selective catalytic reduction of NOx by hydrogen over PtIr/TiO2 catalyst
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DOI：
10.1016/j.cattod.2022.03.025
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发表时间：
2022-03
期刊：
影响因子：
5.3
通讯作者：
Yiyang Zhang;Jiawei Chen;Zhiming Liu
中科院分区：
文献类型：
--
作者：
Yiyang Zhang;Jiawei Chen;Zhiming Liu
制备了PtIr/TiO 2催化剂，研究了O2存在下H2选择性催化还原NOx（H2-SCR）反应。结果表明，PtIr/TiO 2催化剂比Pt/TiO 2和Ir/TiO 2催化剂具有更高的H2-SCR活性和更宽的活性温度窗口，最佳Pt/Ir质量比为1：1。对催化剂的表征表明，PtIr/TiO 2上生成了金属Pt和Ir，这两种活性中心都是H2-SCR反应的有利活性中心。原位DRIFTS研究表明，PtIr/TiO 2上形成了更多的NOx物种、NH3和NH 4+物种。这些都导致PtIr/TiO 2催化剂具有良好的上级催化活性。
PtIr/TiO2catalyst was prepared and investigated for the selective catalytic reduction of NOxby H2(H2-SCR) in the presence of O2. It was found that PtIr/TiO2exhibited higher H2-SCR activity as well as wider activity temperature window than Pt/TiO2and Ir/TiO2catalysts, and the optimum mass ratio of Pt/Ir was 1:1. Characterization of the catalyst showed that metallic Pt and Ir were generated on PtIr/TiO2, both of which were favorable active sites in H2-SCR process. In situ DRIFTS studies showed that more NOxspecies, NH3and NH4+species were formed on PtIr/TiO2. All of these lead to the superior catalytic activity of PtIr/TiO2catalyst.