Citation:
DENG Bing-Xin, ZHANG Bo, JIANG Jian-Feng. Effect of Rare Earth Element in ZrO2-M2O3/MCM-41 (M=La, Ce, Sm, Gd) on Hydrogen Transfer Reaction[J]. Chinese Journal of Inorganic Chemistry,
;2015, (1): 153-158.
doi:
10.11862/CJIC.2015.014
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5%ZrO2/MCM-41 and 5%ZrO2-5%M2O3/MCM-41(M=La,Ce,Sm,Gd)were prepared by the impregnation method. The hydrogen transfer reduction of acetophenone with 2-propanol was investigated over these catalysts. The catalysts were characterized with XRD, N2 adsorption-desorption and FTIR spectra of adsorbed pyridine. The results show that ZrO2 and rare-earth metal oxides disperse on the surface of MCM-41 supports in an amorphous phase or as tiny crystal particles lower than the detection limit of XRD. The catalytic activity obviously varies upon loading rare-earth metal oxides on5%ZrO2-MCM-41, The activities of the catalysts decrease in the order of 5%ZrO2-5%La2O3/MCM-41 > 5%ZrO2-5%Sm2O3/MCM-41 > 5%ZrO2-5%Gd2O3/MCM-41 > 5%ZrO2/MCM-41 > 5%ZrO2-5%Ce2O3/MCM-41. Addition of rare-earth metal oxides leads to strengthening the acidity of Zr-OH, Lewis acid sites and Brönsted acid sites on the catalyst surface. On the other hand, the addition of La2O3 can obviously enhance the number of acid sites on the catalyst surface. On the contrary, the loading of Sm2O3、Gd2O3 results in the slight decrease in the number of acid sites on the catalyst surface, especially, the addition of Ce2O3 leads to a significant drop in the number of acid sites.
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