Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2011, Vol. 32 ›› Issue (2): 250-257.DOI: 10.1016/S1872-2067(10)60172-6

• Research papers • Previous Articles     Next Articles

Preparation of Highly Loaded LaMnOx/SBA-15 Catalyst and Its Toluene Combustion Performance

ZHANG Zekai, LIANG Yiwei, REN Qianru, LIU Huayan, CHEN Yinfei*   

  1. State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China
  • Received:2010-09-19 Revised:2010-10-27 Online:2011-01-26 Published:2014-06-25

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Abstract: A highly loaded LaMnOx/SBA-15 catalyst (60%) was prepared by step coating NH3/water vapor-induced internal hydrolysis (VIH) and characterized by X-ray diffraction, N2 adsorption-desorption, and temperature-programmed reduction (H2-TPR). Its catalytic performance for toluene combustion was also evaluated. The results showed that the VIH process clearly improved the activity of the LaMnOx/SBA-15 catalyst. Using a toluene concentration of 0.86% and a GHSV of 5000 h–1, a 50% toluene conversion was obtained at 205 °C for the LaMnOx/SBA-15 sample prepared by the VIH process. This temperature was 105 °C lower than that for the sample prepared by conventional impregnation. N2 adsorption-desorption and H2-TPR revealed that the VIH process improved the distribution of the LaMnOx active phase in the pores of SBA-15 and improved its reduction properties. The optimal VIH conditions were a temperature of 60 °C and a reaction time of 40 min.

Key words: highly loaded, lanthanum, manganese, composite oxide, SBA-15, vapor-induced internal hydrolysis, catalytic combustion, toluene