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Transient response study of NO reduction with H2 on Co4N/γ-Al2O3 catalyst

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Abstract

The reduction of NO with H2 was studied with transient response experiments on a Co4N/γ-Al2O3 catalyst. In 1 % NO/1 % H2/He step-response on Co4N/γ-Al2O3 catalyst at 300 °C, there were three main stages, viz. initial state, steady state and deactivated state. NO reduction with H2 generated N2 and H2O as the main products and NH3 as the by-product during the steady state. Deactivation of the Co4N/γ-Al2O3 catalyst was due to heavy accumulation of oxygen on the surface. In order to retain a steady-state NO dissociation, the formation of H2O on the catalyst surface was the most crucial step for the removal of surface oxygen, this depended on the NO:H2 ratio and the reaction temperature. The results indicated that a NO:H2 ratio of 1:5 and a reaction temperature of 600 °C was determined to keep the Co4N/γ-Al2O3 catalyst surface sites active for catalytic reduction of NO. Based on the experimental results, the mechanism of reduction of NO with H2 on Co4N/γ-Al2O3 catalyst was proposed.

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Acknowledgments

The work was supported by the National Natural Science Foundation of China (No. 21276253 and No. 21006032).

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Authors and Affiliations

  1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangdong, 510640, China

    Zhiwei Yao & Xiaohong Zhang

  2. Dalian University of Technology, Dalian, 116024, China

    Zhiwei Yao

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  1. Zhiwei Yao
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  2. Xiaohong Zhang
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Correspondence to Zhiwei Yao.

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Yao, Z., Zhang, X. Transient response study of NO reduction with H2 on Co4N/γ-Al2O3 catalyst. Reac Kinet Mech Cat 109, 461–473 (2013). https://doi.org/10.1007/s11144-013-0560-7

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  • DOI: https://doi.org/10.1007/s11144-013-0560-7

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