Abstract
MCM-22 is a MWW type zeolite, which is made of 10membered sinusoidal channels and 12-membered supercages, which are positioned next to each other independently in a three dimensional arrangement. This combination of large and medium pores was reported to be of great advantage in a variety of catalytic applications in petrochemical industry. Recently, several studies have been reported on isomorphous substitution of Al in MCM-22 with B, Fe, and Ga. Among these, we have been particularly interested in B-MCM-22 which can be used as a starting material for Ticontaining MCM-22, better known as Ti-MWW. Ti-MWW demonstrated superior catalytic performances in selected liquid phase epoxidation reactions using H2O2 as an oxidant to that of the best known commercial catalyst, TS-1 (titanium silicalite-1). Direct isomorphous substitution of Ti for Si in MCM-22 structure is not possible and the MWW-type titanosilicate needs to be prepared using boric acid as structure-supporting agent by direct hydrothermal synthesis method. B-MCM22, in this regard, is very useful because it can be prepared in alkali-free synthesis condition and possesses negligible acidity. Ti-MWW can also be prepared from a B-MCM-22 precursor via acid leaching of B species followed by postsynthetic T
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