J. Zheng et al., CVD MODIFIED KL ZEOLITE-SUPPORTED PT FOR N-HEXANE AROMATIZATION, Journal of molecular catalysis. A, Chemical, 130(3), 1998, pp. 271-277
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.