Influence of Localization of Acid Sites on Deactivation of Zeolite MFI in Oligomerization Process of Light Alkenes

被引：8
|
作者：
Popov, A. G. [1 ]
Efimov, A., V [1 ]
Ivanova, I. I. [1 ,2 ]
机构：
[1] Moscow MV Lomonosov State Univ, Fac Chem, Moscow 119991, Russia
[2] Russian Acad Sci, Topchiev Inst Petrochem Synth, Moscow 119991, Russia
来源：
PETROLEUM CHEMISTRY | 2019年 / 59卷 / 07期
基金：
俄罗斯科学基金会;
关键词：
oligomerization of light alkenes; localization of acid sites; deactivation of zeolite MFI; ZSM-5; CATALYSTS; PROPYLENE; BUTYLENE; H-ZSM-5;
D O I：
10.1134/S0965544119070168
中图分类号：
O62 [有机化学];
学科分类号：
070303 ; 081704 ;
摘要：
A series of samples of zeolite MFI with the same morphology, but different concentrations of Bronsted acid sites, have been obtained by means of ion exchange. Methods of temperature-programmed desorption of ammonia (TPD NH3) and IR spectroscopy of absorbed 2,6-di-tert-butylpyridine have demonstrated that the samples differ in the ratio of acid sites in the bulk of zeolite and on the external surface. Stability of the samples against deactivation has been determined in the oligomerization reaction of butylenes using the accelerated deactivation test under severe conditions. It has been shown that the main contribution to deactivation is made by acid sites located on the external surface of zeolite crystals.
引用
收藏
页码：691 / 694
页数：4
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