Synthesis and catalytic performance of ZSM-5/MCM-41 composite molecular sieve from palygorskite |
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| Authors: | Jinlong Jiang Mei Wu Yong Yang Chuansong Duanmu Jing Chen Xu Gu |
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| Institution: | 1.Faculty of Chemical Engineering, Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province,Huaiyin Institute of Technology,Huaian,P.R. China;2.Jiangsu Provincial Engineering Laboratory for Advanced Materials of Salt Chemical Industry,Huaiyin Institute of Technology,Huaian,P.R. China |
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| Abstract: | ZSM-5/MCM-41 composite molecular sieve has been hydrothermally synthesized through a two-step crystallization process using palygorskite (PAL) as silicon and aluminum source. The products were characterized by various means and their catalytic properties for acetalization of cyclohexanone and esterification of acetic acid and n-butanol were also investigated. In the first step ZSM-5 zeolite could be formed from the acid-treated PAL after hydrothermal treatment using tetrapropylammonium bromide as template. XRD patterns, N2 adsorption and desorption data, and TEM images show that the composite obtained in the secondary step had a well-ordered mesoporous MCM-41 phase and a microporous ZSM-5 zeolite phase. Compared with ZSM-5, ZSM-5/MCM-41 composite possessed more total acid amount, weak acid sites and large pore structure due to the formation of MCM-41 and exhibited higher catalytic activity for the acetalization and esterification reaction. |
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