Studies on the TS-1 Zeolites Synthesized by Tetrapropylammonium Bromide as Template

Abstract

the influence of the content of titanium, the variety of the alkali and the amounts of the templates in the gels on the synthesis of the ts-1 zeolites prepared by means of tetrapropylammonium bromide (tpabr) as a template were investigated by h-1-->c-13 cp/mas nmr, si-29 mas nmr, ir, xrd and element analysis techniques. the results showed that the structures of the resultant ts-1 zeolites were transferred from monoclinic symmetry to orthorhombic symmetry with the increase of the titanium content in the framework. the added alkali didn't act as a template in the synthesis of ts-1 zeolites, but the strong alkali conditions were of benefit to the incorporation of the titanium atoms into the lattices. when the molar ratios of tpabr/sio2 in the gels varied from 0.05 to 0.25, the ti content in the framework showed independence of the amounts of tpabr in gels.