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采用醇-水溶液加热法制备了复合均匀的ZrO2-SiO2复合氧化物,通过调整复合物中ZrO2含量及焙烧温度对ZrO2-SiO2复合氧化物表面酸量及酸类型进行精细调控,并将其应用于催化四氢呋喃(THF)开环聚合反应.结果表明,当ZrO2含量小于30 mol%时,随着ZrO2含量的增加,复合物总酸量显著增加,且B酸与L酸酸量之比接近1∶1.当ZrO2含量增至50 mol%时,复合物总酸量增加不明显,但B酸酸量减少而L酸酸量显著增加.经高温焙烧后复合物孔径逐渐增大而孔容逐渐减少;复合物总酸量逐渐减少,但L酸百分含量逐渐增多.在催化THF聚合反应中所制备复合物均表现出较好的催化活性,ZrO2含量为50 mol%的复合物经1173 K焙烧后显示出较大的孔径,催化活性最高,聚合物收率达46.38%.
The composite ZrO2-SiO2 composite oxide was prepared by alcohol-water heating method. The surface acidity and acid type of ZrO2-SiO2 composite oxide were finely regulated by adjusting the content of ZrO2 and the calcination temperature. The results showed that when the content of ZrO2 was less than 30 mol%, the total acidity of the composite increased significantly with the increase of ZrO2 content, and the ratio of the amount of B acid to L acid close to 1: 1. When the content of ZrO2 increased to 50 mol%, the total amount of acid did not increase obviously, but the amount of B acid decreased and the amount of L acid increased significantly.After calcination, the pore size gradually increased and pore volume decreased gradually ; The total acid content of the composite gradually decreased, but the percentage of L acid gradually increased.Complexes prepared in the catalytic THF polymerization showed good catalytic activity, and the composite with 50 mol% ZrO2 was calcined at 1173 K After showing a larger pore size, the highest catalytic activity, the polymer yield of 46.38%.