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研究了钛前驱体、碱种类和合成温度对水热法制备钛酸盐纳米纤维形貌的影响。结果显示,以无定形钛凝胶为前驱体和KOH为碱,均有利于形成无孔的钛酸盐纳米纤维,在90℃下得到了形貌均一,长径比为1 000,比表面积为311 m2/g的钛酸盐纳米纤维。以钛酸盐纳米纤维为载体,采用浸渍法负载了碱金属卤化物作为固体碱催化剂。该催化剂在环氧丙烷醇化制备丙二醇单甲醚的反应中,降低了反应温度、缩短了反应时间,表现出良好的碱催化活性。CO2-TPD结果显示,掺杂后的催化剂的碱含量是空白载体的两倍,并出现中强碱活性中心。
The effects of titanium precursors, alkali species and synthesis temperature on the morphologies of titanate nanofibers prepared by hydrothermal method were studied. The results show that amorphous titanate as precursor and KOH as base are conducive to the formation of nonporous titanate nanofibers, obtained at 90 ℃ uniform morphology, aspect ratio of 1 000, the specific surface area of 311 m2 / g of titanate nanofibers. Using titanate nanofibers as carrier, alkali metal halide was loaded as solid base catalyst by impregnation method. In the reaction of propylene oxide alkylation with propylene glycol monomethyl ether, the catalyst reduces the reaction temperature, shortens the reaction time and exhibits good base catalytic activity. CO2-TPD results show that the alkali content of the doped catalyst is twice that of the blank carrier, and the strong alkali active center appears.