期刊
CHEMICAL ENGINEERING JOURNAL
卷 260, 期 -, 页码 419-426出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2014.09.030
关键词
Tungsten; H-2-SCR; Nitrate species on Pt; NO dissociation
资金
- National Natural Science Foundation of China [21177016, 21277019]
- Basic Research Projects in Science and Technology Program of Qingdao [13-1-4-242-jch]
Pt/HZSM-5 modified by W was studied in the selective catalytic reduction of NOx by hydrogen (H-2-SCR). A maximum NOx conversion of 91.1% with N-2 selectivity of 74.2% was achieved over 0.1 wt.%Pt-1 wt.%W/HZSM-5 at 110 degrees C for the feed gas mixture 910 ppm NO, 90 ppm NO2, 5000 ppm H-2, 10% O-2 in N-2 at gas hourly space velocity 36,000 h(-1). It was found that the interaction between Pt and W is favorable for Pt presenting metallic state in the catalyst. Due to the strong interaction, the dissociation of NO and H-2 on Pt was significantly accelerated and the formation of unfavorable nitrate species was effectively suppressed. As a consequence, the H-2-SCR activity and N-2 selectivity were greatly promoted by W doping the Pt/HZSM-5 catalysts. (C) 2014 Elsevier B.V. All rights reserved.
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