Dealumination of HZSM-5 zeolites .1. Calcination and hydrothermal treatment

被引:159
作者
Campbell, SM
Bibby, DM
Coddington, JM
Howe, RF
Meinhold, RH
机构
[1] UNIV NEW S WALES,DEPT CHEM PHYS,SYDNEY,NSW 2052,AUSTRALIA
[2] UNIV AUCKLAND,DEPT CHEM,AUCKLAND,NEW ZEALAND
[3] IND RES LTD,PETONE,NEW ZEALAND
[4] LOUISIANA STATE UNIV,DEPT CHEM,SHREVEPORT,LA 71105
关键词
D O I
10.1006/jcat.1996.0191
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 ; 081704 ;
摘要
The effect of calcination and hydrothermal treatments on the structure and properties of HZSM-5 zeolites with a range of aluminum contents has been investigated. Characterization of the treated zeolites was undertaken with solid-state NMR (Al-27 and Si-29), infrared, nitrogen and water adsorption, X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, chemical analysis, and Xe-129 NMR spectroscopy, Both calcination and hydrothermal treatment were found to cause dealumination of the zeolite lattice and formation of extralattice aluminum species of low symmetry which remain within the pores of the zeolite. HZSM-5 with low aluminum content was found to be more resistant to dealumination by either method and the degree of dealumination was greater when steam was present in the treatment. Xe-129 NMR was found to be a useful probe for the presence of extralattice aluminum in the pores of lattice dealuminated HZSM-5. (C) 1996 Academic Press,Inc.
引用
收藏
页码:338 / 349
页数:12
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