焙烧温度对CuO/K2CO3/TiO2催化剂NOx储存还原性能的影响

摘要

考察了在不同温度（350、450、550、650和750℃）焙烧后CuO/K₂CO₃/TiO₂催化剂对NO_x的储存还原的性能。应用BET、XRD、HR-TEM、SEM、H₂-TPR和in-situ DRIFTS等技术对催化剂进行详细表征。实验结果表明，不同温度焙烧后，催化剂中的铜物种主要是以CuO相存在。450℃焙烧的CuO/K₂CO₃/TiO₂催化剂活性最佳，NSC为1.808 mmol/g，经过22个稀富燃循环保持稳定，对NO_x还原效率达到99.8%。

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	范丰奇
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关键词： CuO/K₂CO₃/TiO₂；焙烧温度； CuO； NO_x

Abstract：

CuO-K₂CO₃/TiO₂ catalysts were calcined at different temperatures (350, 450, 550, 650 and 750℃). The catalytic performance of the CuO-K₂CO₃/TiO₂ catalysts for NO_x storage and reduction was evaluated. Multiple techniques including BET, XRD, HR-TEM, H₂-TPR and in-situ DRIFTS were employed for catalyst characterization. The results indicate that in the catalysts calcined at different temperatures, the main copper species are CuO. The catalyst calcined at 450℃, displays not only the largest NO_x storage capacity of 1.808 mmol/g at lean condition but also the highest NO_x reduction percentage of 99.8% in cyclic lean/rich atmospheres; moreover, after used for 22 cycles of NO_x storage and reduction at alternative lean/rich atmospheres, the catalytic activity changes very little, showing high catalytic stability.

Keywords： CuO/K₂CO₃/TiO₂； calcination temperature； CuO； NO_x

Received 2015-04-23;

Corresponding Authors: 孟明,E-mail:mengm@tju.edu.cn。 Email: mengm@tju.edu.cn

About author: 范丰奇(1988-),男,硕士研究生,现从事环境催化中汽车尾气净化技术的研究。

引用本文:

范丰奇, 孟明.焙烧温度对CuO/K₂CO₃/TiO₂催化剂NO_x储存还原性能的影响[J]. 化学工业与工程, 2017,34(2): 55-61

Fan Fengqi, Meng Ming.Effect of Calcination Temperature on the Catalytic Performance of Non-Platinic Lean NO_x Trap Catalyst CuO-K₂CO₃/TiO₂[J]. Chemcial Industry and Engineering, 2017,34(2): 55-61

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