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| Study on deactivation of commercial SCR catalyst used in 1000MW coal-fired power plant |
| FANG Tuo-tuo1, GAO Er-hao1, WANG Liang1,2, XU Nan1, WANG Xiao-xiang1, HE Yi1, PAN Hua3, SHI Yao1 |
1. Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China;
2. Zhejiang Zheneng Jiahua Power Plant Co. LTD., Jiaxing 314200, China;
3. College of Biological and Environment Engineering, Zhejiang Shuren University, Hangzhou 310015, China |
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Abstract Fresh and used commercial SCR catalysts (40000hours) obtained from a 1000MW coal-fired plant in Zhejiang Province (China) were examined by catalyst characterization and De-NOx activity test to investigate the deactivation mechanism. The results showed that the deactivation of the catalyst wasattributed to different aspects. (1)Commercial SCR catalyst was poisoned by Fe,S,K and As. The content of Fe, S, K and As on deactivated catalyst increased by 318.0%, 233.3%, 199.3% and 99.8% compared with fresh catalyst, respectively. (2)Deposition of sulphate species and fly ash blocked the pores of SCR catalyst were blocked by Deposition of sulphate species and fly ash, resulting in the decrease of about 20.3%for surface area. (3)Valence of active component (vanadium) and Lewis acid site were changed during the process of deactivation. Compared with fresh catalyst, the V4+/V5+ ratio of deactivated catalyst fell from 6.46 to 1.35, as well as the reduction of 34.2% for Lewis acid site.
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Received: 20 June 2018
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