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Citation: Meng Xian-Ping, Wang Ying-Xia, Wei Cheng-Qian, Zhang Wan-Jing, Lin Bing-Xiong, Liu Xi-Yao. Studies on the Stacking Fault Structure in Zeolite Beta[J]. Acta Physico-Chimica Sinica, ;1996, 12(08): 727-734. doi: 10.3866/PKU.WHXB19960811 shu

Studies on the Stacking Fault Structure in Zeolite Beta

1.
Institute of Physical Chemistry,Peking University,Beijing 100871

Received Date: 9 February 1996
Available Online: 15 August 1996

The framework topology of zeolite beta containing TEA+ compounds as templates is that A, B and C three ordered polytypes, pile up stacking fault structure along [001] orientation. The probability of A, B and C polytypes appeared in zeolite beta is 0.31, 0.36 and 0.33 respectively and does not change with the ratio of silica to alumina. Owing to the four connected modes of building unit I that formed framework of zeolite beta having the same energy, the above probability values come near. In the course of crystal growth the arrangement of TEA+ which sustains the three dimensional channel of the A, B and C is different. The little difference among probability values stems from the fact that the arrangement of B is easier than that of C and the arrangement of C is easier than that of A. Using this template, only zeolite beta with stacking fault structure can be synthesized. In the case, the necessary amount of template is more than that for molecular sieves with two or one dimensional channels and smaller templating molecule, lower reaction temperature and longer crystallization time are advantageous.
- Zeolite beta,
- Building unit,
- Stacking fault structure,
- Template,
- TEA⁺
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