新的固体超强酸ZrO_2-SnO_2-MnO_2/SO_4^(2-)的制备

Preparation of new Solid Superacid ZrO_2-SnO_2-MnO_2/SO_4^(2-)

用化学共沉淀法并用乙二醇作为分散剂制备复合氧化物基ZrO2＿SnO2＿MnO2/SO42-固体超强酸,并对影响酸强度的各种因素进行了考察。确定三种元素最佳物质的量之比、分散剂的用量、硫酸的最佳浓度、浸泡时间、烧结温度等,并对其在乙酸乙酯的酯化反应中的催化作用进行了考察,表明其有一定的活性。通常将几种离子的溶液共沉淀,本实验中把MnO2直接加入到溶液中与Zr4+、Sn4+进行共沉淀,制得了含MnO2的固体超强酸,这方面尚未见过有关报道。

The mixed solid superacid ZrO_2-SnO_2-MnO_2/SO_4^(2-) was prepared by chemical precipitation and factors affected its acid strength were examined.The optimum ratio of three elements、the capacity of distributionagent,the capacity of H_2SO_4,dipped time,heated temperature were determined experimentally.That this solid superacid used as a catalyst was studied.Its strength of acid is same as results reported before and its catalytic activity is weaker than reported.