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Role of complex equilibrium in the shape-selective performances of MgO/MCM-22 catalysts prepared by complexing impregnation

Paper ID Volume ID Publish Year Pages File Format Full-Text
49452 46745 2014 5 PDF Available
Title
Role of complex equilibrium in the shape-selective performances of MgO/MCM-22 catalysts prepared by complexing impregnation
Abstract

•Effects of complex equilibrium on the shape-selectivity of MgO/MCM-22 catalysts•The complex equilibrium was shifted by the addition of HCl.•Improvement in shape-selectivity of MgO/MCM-22 was achieved by addition of HCl.

The role of complex equilibrium in the shape-selectivity of the MgO/MCM-22 catalysts prepared by complexing impregnation was investigated. The presence of hydrochloric acid during the complexing impregnation process resulted in a significant improvement of selectivity for p-xylene production by toluene methylation with dimethyl carbonate over MgO/MCM-22 catalysts. The dramatic performance was ascribed to the designated shifting of the complex equilibrium of malonic acid and Mg2 +, which may alter the coverage of acidic sites on the external surface of zeolite, adjust the pore size of zeolite, and therefore affect the shape-selective performances of the catalysts.

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Keywords
Shape-selectivity; p-Xylene; MCM-22; MgO; Complex equilibrium
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Role of complex equilibrium in the shape-selective performances of MgO/MCM-22 catalysts prepared by complexing impregnation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 56, 5 November 2014, Pages 174–178
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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