Y型分子筛中Brnsted酸和Lewis酸浓度及酸强度分布的同时测定

首次提出红外-重量法,以2,6-二甲基吡啶为分子探针,同时测定分子筛中Br(?)nsted和Lewis酸浓度及酸强度分布。对于Y型分子筛,实验结果表明Lewis酸中心的强度分布较Br(?)nsted酸中心均匀。

Simultaneous Determination of Br(?)nsted and Lewis Site Densities and Strength Distributions on Zeolite Y

An infrared-weight method using 2,6-lutidine as molecular probe has been proposed for the simultaneous determination of Bronsted and Lewis site densities and strength distributions on zeolite. The results show that the Bronsted acid density agrees excellently with previously published data by Dong Yulin et al. on the catalytic dealkylation of cumene over Y zeolite, and the method is valuable for determination of acidic property of zeolite.In the case of Y zeolite, it is shown that the strength distribution of Lewis sites is more homogeneous than that of Bronsted sites.