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《Chinese Journal of Catalysis》 2006-01
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Alkylation of Benzene with 1-Hexene Catalyzed by WO_3/ZrO_2 Soild Acid

WANG Xianyang, SHI Lian, CHEN Changlin*, XU Nanping(College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009, Jiangsu, China)  
A series of WO_3/ZrO_2 and K- or Sr-doped WO_3/ZrO_2 solid acid catalysts were prepared. The effects of K or Sr modification on the structure, surface acidity, and the catalytic performance of WO_3/ZrO_2 were studied by powder X-ray diffraction, NH_3 temperature-programmed desorption, and pyridine FT-IR methods. The addition of K or Sr to WO_3/ZrO_2 could change the structure, acid amount, and acid strength distribution of WO_3/ZrO_2. ZrO_2 in WO_3/ZrO_2 mainly existed as a tetragonal phase, but its content decreased with the addition of K or Sr. The total acid amount, the strong acid sites, and the ratio of Lewis acid sites to Brnsted acid sites decreased after the addition of K or Sr. The synthesized WO_3/ZrO_2 and K- or Sr-doped WO_3/ZrO_2 samples were used in alkylation of benzene with 1-hexene in a liquid phase, and the results showed that the doped WO_3/ZrO_2 solid acid catalysts with a suitable K or Sr content exhibited much higher catalytic activity and stability than WO_3/ZrO_2 at 80 ℃, with the 1-hexene conversion of nearly 99% and monoalkylbenzene selectivity of 100%. In a set of reuse experiments, there was no reduction of the catalyst activity, and the monoalkylbenzene selectivity over the reused catalyst was the same as that over the fresh catalyst. These results suggest that the K- or Sr-doped WO_3/ZrO_2 solid acid is a good solid acid catalyst with better catalytic performance for the alkylation of benzene with 1-hexene.
【Fund】: 国家自然科学基金资助项目(20476047).
【CateGory Index】: O643.32
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