分子筛杂多酸复合物的制备及其在催化反应中应用的研究进展

Progresses in Synthesis of Composite of Molecular Sieve with Heteropolyacid and Its Application as Catalyst

对浸渍法和原位合成法制备分子筛杂多酸复合物及其在催化反应中的应用进行了综述。浸渍法制备的分子筛杂多酸复合物中杂多酸在分子筛内表面高度分散,其酸强度略有降低,可作为烷基化、异构化、酯化、裂解、聚合等诸多反应的催化剂,催化活性高、选择性好,但需解决杂多酸溶脱的问题;原位合成法制备分子筛杂多酸复合物中杂多酸可有效地固定在分子筛中,目前的研究仅处于初级阶段,需对其合成机理、催化活性、多品种合成等进一步研究。

Progresses in synthesis of composite of molecular sieve and heteropolyacid by impregnation method and in-situ synthesis method and its application as catalyst were reviewed. Heteropolyacid was highly dispersed in internal surface of molecular sieve and its acid strength slightly reduced during impregnation synthesis. The impregnated composite could be used as catalyst for alkylation, isomerization, esterification, decomposition and so on, but dissolving escape of heteropolyacid should be solved. Heteropolyacid in composite by in-situ synthesis could be effectively fixed in molecular sieve. The present studies on composite by in-situ synthesis are only in initial stage. Synthesis mechanism, variety of synthesis and enhancement of catalytic activity for composite by in-situ synthesis should be further studied.