New insight into hydroxyl-mediated NH3 formation on the Rh-CeO2 catalyst surface during catalytic reduction of NO by CO

Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (8): 1399-1405.

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New insight into hydroxyl-mediated NH₃ formation on the Rh-CeO₂ catalyst surface during catalytic reduction of NO by CO

Chengxiong Wang^a,b, Wenzheng Xia^b, Yunkun Zhao^a,b

a State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, Yunnan, China;
b State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application, Kunming Sino-platinum Metals Catalysts Co. Ltd., Kunming 650106, Yunnan, China

Received:2017-03-20 Revised:2017-05-04 Online:2017-08-18 Published:2017-08-04
Supported by:
This work was supported by the National Natural Science Foundation of China (21463015), the Provincial Applied Fundamental Research Program of Yunnan (2014FA045), and the National High Technology Research and Development Program of China (863 Program, 2015AA034603).

Abstract

Abstract:

Vibrational IR spectra and light-off investigations show that NH₃ forms via the "hydrogen down" reaction of adsorbed CO and NO with hydroxyl groups on a CeO₂ support during the catalytic reduction of NO by CO. The presence of water in the reaction stream results in a significant increase in NH₃ selectivity. This result is due to water-induced hydroxylation promoting NH₃ formation and the competitive adsorption of H₂O and NO at the same sites, which inhibits the reactivity of NO reduction by NH₃.

Key words: NH₃ formation, NO reduction, CO oxidation, In-situ DRIFTS, Water gas shift

Chengxiong Wang, Wenzheng Xia, Yunkun Zhao. New insight into hydroxyl-mediated NH₃ formation on the Rh-CeO₂ catalyst surface during catalytic reduction of NO by CO[J]. Chinese Journal of Catalysis, 2017, 38(8): 1399-1405.

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New insight into hydroxyl-mediated NH₃ formation on the Rh-CeO₂ catalyst surface during catalytic reduction of NO by CO

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