CVD MODIFIED KL ZEOLITE-SUPPORTED PT FOR N-HEXANE AROMATIZATION

Modification of non-acidic KL zeolite by chemical vapor deposition (CV D) of Si(OEt)(4) and (CH3)(3)Si-O-Si(CH3)(3) followed by Pt loading wa s used to study the influence of zeolite support on the aromatization of n-hexane. Deposited on the framework oxygen ions of the non-acidic zeolite, the silica layer effectively narrowed the pores of KL zeolite . But owing to the appearance of new basic sites, such as potassium ox ide (K2O), the interaction between Pt metal and zeolite support was st rengthened, causing Pt particles to be more electron-excess. n-Hexane pulse-flow microreactions were carried out to study the effects on the aromatization reactivity and sulfur poisoning properties. (C) 1998 El sevier Science B.V.