Influence of Al3+ on polymorph A enrichment in the crystallization of beta zeolite

doi:10.1016/S1872-2067(14)60300-4

Chinese Journal of Catalysis ›› 2015, Vol. 36 ›› Issue (6): 889-896.DOI: 10.1016/S1872-2067(14)60300-4

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Influence of Al³⁺ on polymorph A enrichment in the crystallization of beta zeolite

Tingting Lu^a, Pan Gao^b, Jun Xu^b, Yongrui Wang^c, Wenfu Yan^a, Jihong Yu^a, Feng Deng^b, Xuhong Mu^c, Ruren Xu^a

a State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, Jilin, China;
b State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, Hubei, China;
c State Key Laboratory of Catalytic Materials and Reaction Engineering, Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, China

Received:2014-12-25 Revised:2015-01-26 Online:2015-05-21 Published:2015-05-21
Supported by:
This work was supported by the National Natural Science Foundation of China (21171063), the Excellent Young Scientists Fund (21222103), the National Basic Research Program of China (2011CB808703), State Key Laboratory of Catalytic Materials and Reaction Engineering (RIPP, SINOPEC), and the Program for Changjiang Scholars and Innovative Research Team in University (IRT101713018).

Abstract

Abstract:

Using tetraethylammonium hydroxide as the organic structure-directing agent and in the presence of fluoride, polymorph A-enriched silica beta zeolite was synthesized under concentrated hydrothermal conditions. The introduction of Al species into the same starting mixture resulted in a decrease in the degree of enrichment of polymorph A in beta zeolite and an Al-incorporated beta zeolite resulted. The crystallized polymorph A-enriched silica beta zeolite and the Al-incorporated beta zeolite and their crystallization processes were investigated by X-ray diffractometry, elemental analysis, thermogravimetric analysis-differential thermal analysis, nitrogen adsorption, scanning electron microscopy, and solid-state magic angle spinning nuclear magnetic resonance. The introduction of Al species accelerated crystallization and reduced the crystal size of Al-incorporated beta zeolite. The intermediate of five-coordinated Al species accounted for a decrease in the degree of enrichment of polymorph A in the crystallization of Al-incorporated beta zeolite.

Key words: Beta zeolite, Chirality, Polymorph A, Enrichment

Tingting Lu, Pan Gao, Jun Xu, Yongrui Wang, Wenfu Yan, Jihong Yu, Feng Deng, Xuhong Mu, Ruren Xu. Influence of Al³⁺ on polymorph A enrichment in the crystallization of beta zeolite[J]. Chinese Journal of Catalysis, 2015, 36(6): 889-896.

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Influence of Al³⁺ on polymorph A enrichment in the crystallization of beta zeolite

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