Surface P and Al distribution in P-modified ZSM-5 zeolites

被引：28

作者：

Cardoso, MJB ^{[1
]}

Rosas, DDO ^{[1
]}

Lau, LY ^{[1
]}

机构：

[1] Ilha Fundao, Ctr Pesquisas & Desenvolvimento, BR-21949900 Rio De Janeiro, Brazil

来源：

ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY | 2005年 / 11卷 / 5-6期

关键词：

synthesis techniques; characterization of structure; properties; measurement methods;

D O I：

10.1007/s10450-005-5615-2

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 [物理化学]; 081704 [应用化学];

摘要：

The surface composition of two commercial ZSM-5 zeolites with and without PO4 modification was examined by X-ray photoelectron spectroscopy. Both zeolites were slightly enriched in aluminum on the surface. The surface silica/alumina ratio (SAR) was about half of that of the bulk. Calcination at 600 degrees C decreased slightly this enrichment. After drying with H3PO4 followed by calcination, both zeolites showed surface enrichment Of PO4. The surface of the zeolite with large crystal was more enriched. Steaming resulted in enrichment of aluminum on the surface, in agreement with migration of extra-framework alumina. Increasing phosphate content decreased this enrichment.

引用

页码：577 / 580

页数：4

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