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《Journal of Beijing University of Chemical Technology(Natural Science Edition)》 2008-04
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Effect of nitric acid peptizator on the performance of a MCM-22 zeolite catalyst

YU HaiQing LI JianWei SUN XiaoYan LI YingXia CHEN BiaoHua(The State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology,Beijing 100029,China)  
A series of MCM-22 zeolite catalyst samples have been prepared with nitric acid as peptizator using an extrusion molding method.The zeolites were characterized by means of particle strength tests,TG-DTA,N2 adsorption-desorption measurements,and mercury intrusion porosimetry.The effects of varying the amount of the peptizator on the physical properties of MCM-22 catalyst were investigated.The results showed that with increasing nitric acid dosage,the mechanical strength of the zeolite catalyst increased at first and then decreased,with the maximum catalyst strength being obtained at a dosage of 10 mass percent nitric acid.The specific surface area and total acid were enhanced by adding the appropriate amount of nitric acid.Taking the alkylation of benzene with propylene as a model reaction,the catalytic performances of the MCM-22 zeolite catalysts prepared in this work were evaluated by means of a semi-continuous gas-liquid reactor and a liquid-liquid continuous reactor.The experimental results showed that when the nitric acid dosage was less than 20 mass percent,the activity of MCM-22 zeolite increased with increasing nitric acid dosage.The selectivity to cumene reached a maximum value when the nitric acid dosage was 10 mass percent.
【Fund】: 国家自然科学基金(20576012);; 中国石油化工股份有限公司资助项目(X505016)
【CateGory Index】: O643.36
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