Effect of Different Catalyst Loadings on the Catalytic Performance of SmMn2O5/γ-Al2O3 in NO Oxidation

doi:10.11944/j.issn.1000-0518.2019.02.180109

Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (2): 195-202.DOI: 10.11944/j.issn.1000-0518.2019.02.180109

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Effect of Different Catalyst Loadings on the Catalytic Performance of SmMn₂O₅/γ-Al₂O₃ in NO Oxidation

YANG Zhi()

College of Electronic Information and Optical Engineering,Nankai University,Tianjin 300350,China

Received:2018-04-11 Published:2019-02-01 Online:2019-01-31

Abstract

Abstract:

Noble metal catalyst exhibits excellent effects on the catalytic oxidation of NO_x, but the cost is high. The supported catalysts and non-noble metal catalysts have been widely explored. In this work, SmMn₂O₅(SMO) and SmMn₂O₅/γ-Al₂O₃ catalysts were prepared by hydrothermal method and impregnation method, respectively, and the effect of the content of SmMn₂O₅ on the catalytic oxidation of NO was investigated. Scanning electron microscopy(SEM), specific surface area(BET) and pore size distribution analysis, temperature programmed reduction(TPR) and temperature programmed desorption(TPD) were conducted towards different SmMn₂O₅ loadings(5%100% mass fraction). The catalytic oxidation performance of NO was subsequently carried out. The results indicate that the 25%(mass fraction) SmMn₂O₅/γ-Al₂O₃ catalyst shows the lowest light off temperature(260 ℃) among the load mass fraction of 35%, 25%, 15% and 5%. Continuing increasing SMO loadings mass fraction up to 50% and 75%, it is found that the light off temperature of the two samples only drops off 10℃ relative to 25% SmMn₂O₅/γ-Al₂O₃ catalyst and increases 40 ℃ in regards to the pure phase of mullite SMO. This exploration will provide some guidance for the effective utilization of SmMn₂O₅ catalyst in the future, and introduce certain method for the design of supported non-noble metal catalysts.

Key words: SmMn₂O₅, catalyst, NO catalytic oxidation

YANG Zhi. Effect of Different Catalyst Loadings on the Catalytic Performance of SmMn₂O₅/γ-Al₂O₃ in NO Oxidation[J]. Chinese Journal of Applied Chemistry, 2019, 36(2): 195-202.

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Effect of Different Catalyst Loadings on the Catalytic Performance of SmMn₂O₅/γ-Al₂O₃ in NO Oxidation

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