Regeneration of sulfur-poisoned CeO2 catalyst for NH3-SCR of NOx |
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| Affiliation: | 1. Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Institute of Industrial Ecology and Environment, Zhejiang University, Hangzhou 310027, China;2. Institute of Environmental Engineering, Zhejiang University, Hangzhou 310058, China;1. Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China;2. Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China;3. University of Chinese Academy of Sciences, Beijing 100049, PR China;4. Department of Environmental Science and Engineering, School of Energy and Power Engineering, Xi''an Jiaotong University, Xi''an 710049, PR China |
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| Abstract: | The effects of regeneration on the activities and structure of CeO2 catalysts for NH3-SCR of NOx have been studied in this article. CeO2 catalyst is deactivated by SO2 for NH3-SCR of NOx in a 200 h long-term operation at 350 °C due to the formation of sulfates, and its NOx conversion decreases from 100% to 83% gradually. However, sulfates can be removed from sulfur-poisoned CeO2 catalysts under high temperature thermal treatment in air. After regeneration, NOx conversion of sulfur-poisoned CeO2 catalyst is recovered to about 100% at 350 °C. Moreover, the regeneration temperature is related to the nature of the sulfates formed on the sulfur-poisoned CeO2 catalysts. |
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