The Crystallization Process of MCM-49/ZSM-35 Composite Zeolites in a Mixed-Amine System

doi:10.3724/SP.J.1088.2010.00510

Chinese Journal of Catalysis ›› 2010, Vol. 31 ›› Issue (8): 1071-1076.DOI: 10.3724/SP.J.1088.2010.00510

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The Crystallization Process of MCM-49/ZSM-35 Composite Zeolites in a Mixed-Amine System

XIE Sujuan1, LIU Kefeng1, 2, LIU Shenglin1, LIU Yong1, ZHANG Weiping1, 3, XU Longya1, 3, *

1Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China 2Graduate University of Chinese Academy of Sciences, Beijing 100049, China 3State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China

Received:2010-05-07 Online:2010-08-30 Published:2013-12-26

Abstract

Abstract: The crystallization process of MCM-49/ZSM-35 composite zeolites in the Na2O-SiO2-Al2O3-CHA (cyclohexamine)-HMI (hexa-methyleneimine)-H2O system was investigated by X-ray diffraction, N2 adsorption, scanning electron microscopy, and Fourier transform infrared spectroscopy. The results showed that in the HMI-CHA system, pure phase MCM-49 was obtained first, then MCM-49/ZSM-35 composite zeolites were gradually formed with increasing ZSM-35 content upon the crystallization time, and finally pure phase ZSM-35 was produced. Moreover, the formation of ZSM-35 zeolite was based on the consumption of MCM-49 zeolite in this mixed-amine system.

Key words: MCM-49, ZSM-35, composite zeolite, synthesis, crystallization process, cyclohexamine, hexamethyleneimine

XIE Sujuan1, LIU Kefeng1, 2, LIU Shenglin1, LIU Yong1, ZHANG Weiping1, 3, XU Longya1, 3, *. The Crystallization Process of MCM-49/ZSM-35 Composite Zeolites in a Mixed-Amine System[J]. Chinese Journal of Catalysis, 2010, 31(8): 1071-1076.

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The Crystallization Process of MCM-49/ZSM-35 Composite Zeolites in a Mixed-Amine System

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