Effects of rare earth content on catalytic properties of Y zeolite

被引：0

作者：

Liu P. ^{[1
]}

Zhang Z. ^{[1
]}

Gao X. ^{[1
]}

机构：

[1] Lanzhou Petrochemical Research Center, Petrochemical Research Institute, CNPC

来源：

Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) | 2010年 / 26卷 / SUPPL. 1期

关键词：

Infrared spectrum of pyridine adsorbed on acid sites; Ion-change; NH[!sub]3[!/sub] temperature programmed desorption; Y zeolite;

D O I：

10.3969/j.issn.1001-8719.2010.z1.020

中图分类号：

学科分类号：

摘要：

REY(RE means rare earth element) zeolites with varying RE content were prepared by ion-exchange procedure in aqueous system. X-ray diffraction analysis revealed that all RE ions were located at lattice sites of Y zeolite, and no feature peaks of RE2O3 were detected in XRD patterns. NH3-temperature programmed desorption technique and infrared spectrosocy for pyridine adsorbed on acid sites were employed to investigate acid properties of REY zeolites. It is found that REY zeolites with high RE content possessed less Lewis acid sites(151 μmol/g) and more strong acid sites in comparison with those of low RE content REY zeolites. Catalytic cracking performances of model catalysts incorporating REY zeolites further demonstrated that the variation of acid properties played a critical role in acid based catalysis and the yield of bottom oil decreased from 5.93% to 5.15% with increasing RE content in catalyst. Additionally, RE ions can effectively inhibit the extraction of Al atoms from framework.

引用

页码：107 / 111

页数：4

共 11 条

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