Influence of Synthesis Method on Structure and Catalytic Performance of MCM-22 Zeolites

Abstract

Abstract: Pure MCM-22 with a high crystalline was hydrothermally synthesized by dynamic and static(methods,) respectively.The influence of the synthesis conditions on the structure and properties of MCM-22 was studied by means of N₂ adsorption,XRD,TEM and FTIR. MCM-22 synthesized by dynamic method shows much smaller crystal and lower concentration of acid sites than those of synthesized by static method.The Pd-supported catalyst on MCM-22 synthesized by static method shows a higher acetone conversion than that prepared by dynamic method in one-step synthesis of methyl isobutyl ketone(MIBK) from acetone.We attributed this to the higher concentration of acid sites of MCM-22 synthesized by static method.While the selectivity to MIBK exhibited an adverse trend,this might be due to shorter distance of the channel,which decreased the contact time of the reactants in the channels.As a result,the selectivities of the further condensation and hydrogenation products decreased.

Key words: MCM-22 zeolite, Synthesis method, Methyl isobutyl ketone(MIBK), Concentration of acid site

CLC Number:

O643.1

TrendMD:

YANG Piao-Ping, WANG Zhen-Lü, YU Jian-Feng, XU Ning, LIU Qing-Sheng, SU Mei-Ping, WU Tong-Hao. Influence of Synthesis Method on Structure and Catalytic Performance of MCM-22 Zeolites[J]. Chem. J. Chinese Universities, 2005, 26(11): 2108.

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Influence of Synthesis Method on Structure and Catalytic Performance of MCM-22 Zeolites

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