Study on Ti-MCM-41 zeolites prepared from inorganic Ti sources

A novel method for preparing mesoporous Ti - MCM - 41 has been developed. B y means of stabilizing Ti4+ with H2O2, a series of Ti - MCM - 41 with diffe rent inorganic titanic salts as Ti sources have been synthesized via an ele ctrostatic S+I- templating pathway using [C16H33N (CH3)(3)] Br (CTMAB) as t he surfactant. The samples were characterized by powder X -ray diffraction ( XRD), FT - IR and nitrogen adsorption, the results show that the samples have highly ordered mesoporous structure and Ti atoms have been incorporate d into the framework. In catalyzing oxidation of styrene with hydrogen pero xide (H2O2), the Ti MCM - 41 samples prepared from inorganic Ti sources exh ibits higher catalytic activity than those prepared from organic Ti species ( TBOT). The nature of inorganic titanic salts has considerable influence upon the incorporation of Ti into the silica framework. The samples prepare d from Ti (SO4)(2) or TiCl4 possess higher catalytic activity for the oxida tion of styrene with H2O2.