Synthesis of high silica CHA zeolites with controlled Si/Al ratio

被引：0
|
作者：
Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N, 0315 Oslo, Norway [1 ]
不详 [2 ]
不详 [3 ]
不详 [4 ]
机构：
来源：
Studies in Surface Science and Catalysis | 2008年 / 174卷 / 0A期
关键词：
Particle size - Silica - Atomic emission spectroscopy;
D O I：
10.1016/S0167-2991(08)80193-0
中图分类号：
O61 [无机化学]; TQ [化学工业];
学科分类号：
070301 ; 0817 ; 081704 ;
摘要：
Zeolites with the CHA topology have been synthesized with Si/Al ratios ranging from 15 to 133. ICP-AES analysis shows that the Si/Al ratio in the material is close to linearly related to the Si/Al ratio in the reaction mixture, while powder XRD shows that the unit cell parameters decrease with increasing Si/Al ratio. The difference between the unit cell parameters for the as-synthesized and the calcined samples show that the structure directing agent sterically hinders the contraction in the c-axis direction for the as-synthesized samples. A relationship between the Si/Al ratio in the material and the a-axis has been established. The particle size of the material also shows a dependency on the Si/Al ratio of the material. © 2008 Elsevier B.V. All rights reserved.
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页码：265 / 268
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