Effect of Calcination Temperature on the Catalytic Performance of Non-Platinic Lean NOx Trap Catalyst CuO-K2CO3/TiO2

化学工业与工程

Chemcial Industry and Engineering

2017, Vol. 34

Issue (2) :55-61 DOI: 10.13353/j.issn.1004.9533.20151065

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Effect of Calcination Temperature on the Catalytic Performance of Non-Platinic Lean NO_x Trap Catalyst CuO-K₂CO₃/TiO₂

Fan Fengqi, Meng Ming

School of Chemical Engineering and Technology, Tianjin University, Tianjin Key Laboratory of Applied Catalysis Science and Engineering, Tianjin 300072, China

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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.

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	Fan Fengqi
	Meng Ming

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

Received 2015-04-23;

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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,V34(2): 55-61

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