Synthesis, Characterization and Control of Proportion of Polymorph C in ITQ-16 and ITQ-17 Films

doi:10.1007/s40242-016-6126-2

Chemical Research in Chinese Universities ›› 2016, Vol. 32 ›› Issue (6): 895-901.doi: 10.1007/s40242-016-6126-2

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Synthesis, Characterization and Control of Proportion of Polymorph C in ITQ-16 and ITQ-17 Films

CHEN Yanli^1,2, FENG Lai¹

1. College of Physics, Optoelectronics and Energy, Soochow University, Suzhou 215006, P. R. China;
2. School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, P. R. China

Received:2016-03-31 Revised:2016-05-30 Online:2016-12-01 Published:2016-08-29
Contact: CHEN Yanli, E-mail:yanlichen@live.com; FENG Lai, E-mail:fenglai@suda.edu.cn E-mail:yanlichen@live.com;fenglai@suda.edu.cn
Supported by:
Supported by the China Postdoctoral Science Foundation(No.2013M541716), the Postdoctoral Science Foundation of Jiang-su Province, China(No.1301055C) and the Scientific Research Foundation for the Returned Overseas Chinese Scholars of the Ministry of Education of China(No.K510900314).

Abstract

Abstract:

Continuous ITQ-16 and ITQ-17 films on silicon wafer were prepared in fluoride media using TEAOH as organic structure-directing agent. The proportion of polymorph C in the as-synthesized ITQ-16 and ITQ-17 films was determined via X-ray diffraction characterization. The proportion of polymorph C in the ITQ-16 and ITQ-17 films was controlled via optimizing the compositions of the reaction mixtures and reaction conditions, such as varying the Si/Ge molar ratio and adding n-propyl alcohol as a solvent in the reaction mixture. The Ge atoms in the reaction media strongly increased the crystallization of polymorph C in ITQ-16 and ITQ-17 films. Moreover, the stabilizing and buffering effect of n-propyl alcohol on crystal growth further enhanced the proportion of polymorph C in the ITQ-16 and ITQ-17 films. For potential catalytic applications, Al was incorporated into the framework of polymorph C, and a pure phase of polymorph C in Al-ITQ-17 film was achieved from the synthesis gel in the n-propyl alcohol phase.

Key words: Zeolite beta, ITQ-16, ITQ-17, Polymorph C

CHEN Yanli, FENG Lai. Synthesis, Characterization and Control of Proportion of Polymorph C in ITQ-16 and ITQ-17 Films[J]. Chemical Research in Chinese Universities, 2016, 32(6): 895-901.

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Synthesis, Characterization and Control of Proportion of Polymorph C in ITQ-16 and ITQ-17 Films

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