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

Yusuke Inomata, Hiroe Kubota, Shinichi Hata, Eiji Kiyonaga, Keiichiro Morita, Kazuhiro Yoshida, Norihito Sakaguchi, Takashi Toyao, Ken-ichi Shimizu, Satoshi Ishikawa, Wataru Ueda, Masatake Haruta and Toru Murayama ()
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Yusuke Inomata: Tokyo Metropolitan University Hachioji
Hiroe Kubota: Hokkaido University
Shinichi Hata: Sanyo-Onoda City University
Eiji Kiyonaga: The Chugoku Electric Power Company, Incorporated
Keiichiro Morita: The Chugoku Electric Power Company, Incorporated
Kazuhiro Yoshida: The Chugoku Electric Power Company, Incorporated
Norihito Sakaguchi: Hokkaido University
Takashi Toyao: Hokkaido University
Ken-ichi Shimizu: Hokkaido University
Satoshi Ishikawa: Kanagawa University
Wataru Ueda: Kanagawa University
Masatake Haruta: Tokyo Metropolitan University Hachioji
Toru Murayama: Tokyo Metropolitan University Hachioji

Nature Communications, 2021, vol. 12, issue 1, 1-11

Abstract: Abstract 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 °C) and in the presence of water (~20 vol%). The 3.5 mol% W-substituted vanadium oxide shows >99% (dry) and ~93% (wet, 5–20 vol% water) NO conversion at 150 °C (250 ppm NO, 250 ppm NH3, 4% O2, SV = 40000 mL h−1 gcat−1). Lewis acid sites of W-substituted vanadium oxide are converted to Brønsted acid sites under a wet condition while the distribution of Brønsted and Lewis acid sites does not change without tungsten. NH4+ species adsorbed on Brønsted acid sites react with NO accompanied by the reduction of V5+ sites at 150 °C. The high redox ability and reactivity of Brønsted 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.

Date: 2021
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DOI: 10.1038/s41467-020-20867-w

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