Bulk tungsten-substituted vanadium oxide for low-temperature NOx removal in the presence of water

被引:118
作者
Inomata, Yusuke [1 ]
Kubota, Hiroe [2 ]
Hata, Shinichi [3 ]
Kiyonaga, Eiji [4 ]
Morita, Keiichiro [4 ]
Yoshida, Kazuhiro [4 ]
Sakaguchi, Norihito [5 ]
Toyao, Takashi [2 ]
Shimizu, Ken-ichi [2 ]
Ishikawa, Satoshi [6 ]
Ueda, Wataru [6 ]
Haruta, Masatake [1 ]
Murayama, Toru [1 ,7 ]
机构
[1] Tokyo Metropolitan Univ, Res Ctr Gold Chem, Grad Sch Urban Environm Sci, Hachioji, Tokyo 1920397, Japan
[2] Hokkaido Univ, Inst Catalysis, Sapporo, Hokkaido 0010021, Japan
[3] Sanyo Onoda City Univ, Fac Engn, Dept Appl Chem, Sanyo Onoda, Yamaguchi 7560884, Japan
[4] Chugoku Elect Power Co Inc, Energia Econ & Tech Res Inst, Higashihiroshima, Hiroshima 7390046, Japan
[5] Hokkaido Univ, Fac Engn, Ctr Adv Res Energy & Mat, Lab Integrated Funct Mat, Sapporo, Hokkaido 0608628, Japan
[6] Kanagawa Univ, Fac Engn, Dept Mat & Life Chem, Yokohama, Kanagawa 2218686, Japan
[7] Yantai Univ, Shandong Appl Res Ctr Gold Nanotechnol Au SDARC S, Yantai Key Lab Gold Catalysis & Engn, Sch Chem & Chem Engn, Yantai 264005, Peoples R China
关键词
SELECTIVE CATALYTIC-REDUCTION; NITRIC-OXIDE; ACTIVE-SITES; TITANIA CATALYSTS; ACID SITES; SURFACE; SCR; AMMONIA; NH3; KINETICS;
D O I
10.1038/s41467-020-20867-w
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Y NH3-SCR (selective catalytic reduction) is important process for removal of NOx. However, water vapor included in exhaust gases critically inhibits the reaction in a low temperature range. Here, we report bulk W-substituted vanadium oxide catalysts for NH3-SCR at a low temperature (100-150 degrees C) and in the presence of water (similar to 20vol%). The 3.5mol% W-substituted vanadium oxide shows >99% (dry) and similar to 93% (wet, 5-20 vol% water) NO conversion at 150 degrees C (250 ppm NO, 250 ppm NH3, 4% O-2, SV=40000mLh(-1) g(cat)(-1)). Lewis acid sites of W-substituted vanadium oxide are converted to BrOnsted acid sites under a wet condition while the distribution of BrOnsted and Lewis acid sites does not change without tungsten. NH4+ species adsorbed on BrOnsted acid sites react with NO accompanied by the reduction of V5+ sites at 150 degrees C. The high redox ability and reactivity of BrOnsted acid sites are observed for bulk W-substituted vanadium oxide at a low temperature in the presence of water, and thus the catalytic cycle is less affected by water vapor.
引用
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页数:11
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