铈钴复合氧化物催化剂催化CO-SCR反应机理研究

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Abstract

In this paper, a series of Ce-Co-O_x catalysts were prepared by co-precipitation method and the CO-SCR performance was studied. The influence of Co and Ce ratio on the activity of CO-SCR was investigated and the Ce(0.3)-Co(0.7)-O_x sample showed the highest NO conversion efficiency of 84% at 250℃. According to characterization results, it was proposed that the active sites for CO-SCR is Co in Ce(0.3)-Co(0.7)-O_x. There were two reasons responsible for the enhanced catalytic performance by Ce doping into the Ce-Co-O_x catalyst. Firstly, the specific surface area and adsorption capacity were increased with Ce doping. Secondly, a solid solution was formed in Ce-Co-O_x catalyst, resulting in the enhanced oxygen migration rate. In situ DRIFTs results suggested that the CO-SCR is likely to follow a mechanism that gaseous or weakly-adsorbed CO reacts with adsorbed NO species in the forms of bridging bidenate nitrite and chelate nitrate.

Key words： cerium oxide cobalt oxide CO-SCR weak adsorbed CO bridging bidentate nitrite species

Received: 14 January 2018

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	Articles by authors
	FU Yu-xiu
	ZHONG Xue-mei
	CHANG Hua-zhen
	LI Jun-hua

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FU Yu-xiu,ZHONG Xue-mei,CHANG Hua-zhen等. Mechanism study on CO-SCR over Ce-Co-O_x mixed oxides catalysts[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(8): 2934-2940.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I8/2934

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