超重力下氧化锰八面体分子筛生长机理及催化性能

Growth mechanism and catalytic performance of manganese oxide octahedral molecular sieves under high-gravity environment

在超重力反应器中利用氧化还原沉淀法合成出氧化锰八面体分子筛纳米棒,通过比较产物的形貌差异提出氧化锰八面体分子筛纳米棒在超重力环境中的生长机理,并考察其作为载体材料在催化氧化羰基化合成反应中的性能。结果表明:在超重力环境中氧化锰八面体分子筛纳米棒的生长符合"成核-溶解-各向异性生长-重结晶"机理。活性测试结果表明,采用高锰酸钾和蔗糖反应制备出的氧化锰八面体分子筛纳米棒载体表现出更好的催化活性和氧物种活泼性,碳酸二苯酯收率可达9.2%。

Manganese oxide octahedral molecular sieves （OMS-2） nanorods were prepared in high gravity reactor by redox precipitation method.Growth mechanism of OMS-2 nanorods was proposed according to morphology evolution observed by characterization techniques.Performance of OMS-2 nanorods as catalyst support in preparation process of oxidative carbony- lation was studied.Characterization results showed that the crystal growth process accorded with the mechanism of ＇nucle- ation, dissolution, anisotropic growth, and recrystallization＇ .OMS-2 nanorods obtained in high gravity reactor were used as catalyst supports and applied in oxidative carbonylation of phenol.Active results showed that OMS-2 supports prepared by potassium permanganate and sucrose as reducing agents showed the better catalytic and oxidative activities,and DPC yield reached 9.2%.