Effect of CuSAPO-34 catalyst preparation method on NOx removal from diesel vehicle exhausts

doi:10.1016/S1872-2067(11)60517-2

Abstract

Abstract:

CuSAPO-34 samples prepared by hydrothermal synthesis (HS), pore-volume impregnation (PVI), and ion-exchange (IE) methods were characterized using X-ray diffraction, scanning electronic microscopy, atomic absorption spectroscopy, temperature-programmed reduction with hydrogen, X-ray absorption near-edge structure spectroscopy, X-ray photoelectron spectroscopy, and N₂ adsorption. The selective catalytic reduction (SCR) ability over CuSAPO-34 for NO_x from a simulated diesel exhaust was investigated through C₃H₆-SCR and NH₃-SCR, before and after aging of the CuSAPO-34 catalyst. The results indicated that the sample prepared by IE had significantly better activity compared with those prepared using HS and PVI, especially in C₃H₆-SCR at temperatures below 300℃. The activity of CuSAPO-34 in NO SCR was affected by the preparation method as a result of changes in the specific area (A_BET), pore-size distribution, and the valence state of the active component. The active component of the catalyst prepared by HS was mainly Cu²⁺, whereas those of samples prepared by IE and PVI were mainly Cu⁺. Aging treatment can destroy the structure of the catalyst, decrease its surface area, and reduce the number of active Cu components on the catalyst surface, leading to a visible decrease in catalytic activity. The CuSAPO-34 prepared using the PVI method had the smallest decrease in NO SCR activity after aging, showing that it had better anti-aging properties.

Key words: CuSAPO-34, Hydrothermal synthesis, Ion-exchange, Pore volume impregnation, Selective catalytic reduction, Aging

ZUO Yongquan, HAN Lina, BAO Weiren, CHANG Liping, WANG Jiancheng. Effect of CuSAPO-34 catalyst preparation method on NO_x removal from diesel vehicle exhausts[J]. Chinese Journal of Catalysis, 2013, 34(6): 1112-1122.

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Effect of CuSAPO-34 catalyst preparation method on NO_x removal from diesel vehicle exhausts

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