Effect of transition metal additives on composite cobalt catalyst for NO x reduction with CH4
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- 作者：Jiaqi Chen (1) (2)
Shuwei Chen (1) (2)
Ruifeng Li (1) (2)
Jiajun Zheng (1) (2) - 关键词：NO reduction ; cobalt ; zinc ; BZZ ; BMZ ; cooperative effect
- 刊名：Russian Journal of Physical Chemistry A, Focus on Chemistry
- 出版年：2014
- 出版时间：July 2014
- 年：2014
- 卷：88
- 期：7
- 页码：1103-1112
- 全文大小：
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Shuwei Chen (1) (2)
Ruifeng Li (1) (2)
Jiajun Zheng (1) (2)
1. Research Centre of Energy Chemical and Catalytic Technology, Taiyuan University of Technology, Taiyuan, 030024, PR China
2. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, PR China - ISSN：1531-863X
文摘
The CoH-BZZ and CoH-BMZ catalysts have good catalytic activity in the selective catalytic reduction of NO (NO-SCR) by methane, but have less selectivity at the reaction temperatures above 600°C. It was found that the addition of different transition metals to CoH-BZZ took different effect on SCR of NO by methane. Besides, Zn additives improved effectively the selectivity of methane towards NOx reduction. The nature of the active sites is characterized by diffuse reflectance H2-TPR and XPS. These techniques show that in both CoZn-BZZ and CoZn-BMZ catalysts the cobalt is present as mononuclear Co2+ species, and the bind energy also decreased compared with CoH-composites (-BZZ and -BMZ). Reactivity of both CoZn-BZZ and CoZn-BMZ is much higher than that found on Co based catalysts in temperature range between 500 and 650°C.