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首次以Hβ沸石为基础,采用一步浸渍法(A)、机械研磨法(B)、沉积-沉淀法(C)及分步浸渍法(D)制备了SO-Fe2O3-Hβ-Al2O3催化剂,通过XRD,XPS,NH3-TPD,FT-IR及化学吸附等手段对其物理化学性能进行了表征,并对其催化丙烯与异丙醇的酸化反应性能进行了评价.结果表明,在催化剂表面,SO,Fe2O3及Hβ沸石之间存在较强的化学作用,A法和C法制备的催化剂具有明显的增强酸性;总酸量和L酸量增多,酸强度提高;该催化剂明显促进了丙烯醚化反应,其丙烯和异丙醇转化率分别由Hβ-Al2O3沸石的7.98%和35.1%提高到14.8%和40.0%,并发现该反应主要在L酸中心上进行.
For the first time, the catalyst of SO-Fe2O3-Hβ-Al2O3 was prepared by one-step impregnation method (A), mechanical grinding method (B), deposition- precipitation method (C) and step impregnation method (D) , XPS, NH3-TPD, FT-IR and chemical adsorption were used to characterize their physico-chemical properties. The catalytic performance of the catalysts for the acidification of propylene and isopropanol was also evaluated. The results show that there is a strong chemical interaction between SO, Fe2O3 and Hβ zeolites on the surface of the catalyst. The catalysts prepared by the methods A and C have obviously enhanced acidity; the total acidity and L acidity increase, and the acid strength increases The catalyst significantly promoted the propylene etherification reaction. The conversion of propylene and isopropanol increased from 7.98% and 35.1% of Hβ-Al2O3 zeolite to 14.8% and 40.0%, respectively. It was found that the reaction was mainly L acid center.