Low-temperature NH3-SCR Activity of Nanoparticulate Gold Supported on a Metal Oxide

Yusuke INOMATA; Makoto MINO; Shinichi HATA; Eiji KIYONAGA; Keiichiro MORITA; Kenji HIKINO; Kazuhiro YOSHIDA; Masatake HARUTA; Toru MURAYAMA

doi:10.1627/jpi.62.234

Regular Papers – Feature articles: Commemorative Tokyo Conv. on 60th Anniversary of JPI

Low-temperature NH₃-SCR Activity of Nanoparticulate Gold Supported on a Metal Oxide

Yusuke INOMATA, Makoto MINO, Shinichi HATA, Eiji KIYONAGA, Keiichiro MORITA, Kenji HIKINO, Kazuhiro YOSHIDA, Masatake HARUTA, Toru MURAYAMA

Author information

Yusuke INOMATA
Research Center for Gold Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University
Makoto MINO
Research Center for Gold Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University
Shinichi HATA
Research Center for Gold Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University
Dept. of Engineering, Sanyo-Onoda City University
Eiji KIYONAGA
Energia Economic and Technical Reserach Institute, The Chugoku Electric Power Co., Inc.
Keiichiro MORITA
Energia Economic and Technical Reserach Institute, The Chugoku Electric Power Co., Inc.
Kenji HIKINO
Energia Economic and Technical Reserach Institute, The Chugoku Electric Power Co., Inc.
Kazuhiro YOSHIDA
Energia Economic and Technical Reserach Institute, The Chugoku Electric Power Co., Inc.
Masatake HARUTA
Research Center for Gold Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University
Toru MURAYAMA Corresponding author
Research Center for Gold Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University

Keywords: Selective catalytic reduction, Gold, Nitrogen oxide, Ammonia, Environmental catalyst, Coal-fired power plant

JOURNAL FREE ACCESS

2019 Volume 62 Issue 5 Pages 234-243

DOI https://doi.org/10.1627/jpi.62.234

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Abstract

Nitrogen oxide (NO_x) is the main pollutant produced from power plants and boiler. The development of catalysts that can work to reduce NO_x under ambient conditions at a low reaction temperature has been required. In this work, we examined the NH₃-selective catalytic reduction (SCR) activity of metal oxide-supported gold catalysts in order to develop NH₃-SCR catalysts working at low temperatures (<200 °C). Au/CuO showed NH₃-SCR activity at 100 °C (NO conversion = 20 %, N₂ selectivity = ca. 100 %), though the production of N₂O as a by-product caused by NH₃ oxidation was observed at a higher reaction temperature. We found that deposition of 0.1 wt% of gold on CuO is sufficient for NH₃-SCR to proceed and that NH₃ oxidation proceeds with increase in the loading amount of gold (<0.5 %) at a high reaction temperature. Although we measured the NH₃-SCR activities of Pt/CuO and Pd/CuO, Au/CuO showed better activity than those of other precious metal catalysts. We also tested binary metal oxide-supported gold catalysts and found that 1 wt%Au/10 wt%CuO/Al₂O₃ showed the largest N₂ yield (45 %) owing to the introduction of other metal oxide species to CuO. The results indicated that a gold catalyst has the potential to catalyze NH₃-SCR at low temperatures.

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