SYNTHESIS OF INTERLAYER EXPANSION TI-MWW MOLECULAR SIEVE AND IT'S CATALYTIC PERFORMANCE IN CYCLOHEXENE EPOXIDATION
Preparation of Ti-MWW zeolite with larger reaction channel is great important in improving diffusion and catalytic activity in oxidation of bulky molecules.Herein,an innovative strategy of synthesizing interlayer expansion Ti-MWW was proposed in the present study via evaporating the fumed SiO2,boric acid,H2TiF6/H2O2 and TEAOH solution to get mixture dry-gel.The mixture was converted to Ti-MWW precursor by dry-gel conversion,the precursor was then washed by HNO3 and further calcined to fabricate Ti-MWW.Ti-MWW was characterized by XRD,TEM and BET to examine the interlayer expansion structure and extra mesopore volume,the interlayer expansion structure was created via the interaction of silanol group on in-situ ERB lamellar precursor and peroxotitanium.The conversion of cyclohexene increased from 5.46％to 12.7％,and selectivity of 1,2-Epoxycyclohexane(CHO)increased to 49.5％.Furthermore the selectivity of CHO improved to 80.5％when using anhydrous TBHP as an oxidant.
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