石油化工2012，Vol.41Issue(3)：277-282,6.
络合浸渍MgO改性MCM-22催化甲苯与碳酸二甲酯烷基化合成对二甲苯
Selective Synthesis of p-Xylene from Toluene and Dimethyl Carbonate over MgO-Modified MCM-22 Prepared by Complexation Impregnation Method
摘要
Abstract
MgO-modified MCM-22 molecular sieve catalysts with 20% MgO loading(20%MgO/ MCM-22) were prepared by complexation impregnation method with Mg(NO3)2 as precursor and citric acid as complexing agent. Selective synthesis of p-xylene by alkylation of toluene with dimethyl carbonate(DMC) was studied over the prepared 20%MgO/MCM-22 catalysts in a continuous flow fixed-bed reactor. The synthesized catalysts were characterized by means of XRD, N2 adsorption-desorption, NH3-TPD and Py-FTIR. The results indicated that the alkylation of toluene with DMC occurred mainly on Bronsted acid sites. The catalysts could maintain high catalytic activity through adding citric acid in the impregnation process. The selectivity to p-xylene increased significantly with adding NaOH. With the increase in NaOH dosage, the conversion of toluene decreased slightly while the selectivity to p-xylene increased gradually.关键词
络合浸渍法/氧化镁/MCM-22分子筛/择形催化/甲苯/碳酸二甲酯/对二甲苯Key words
complexation impregnation method/ magnesium oxide/ MCM-22 molecular sieve/shape-selective catalysis/ toluene/ dimethyl carbonate/ p-xylene分类
化学化工引用本文复制引用
张俞,薛冰,许杰,刘平,李永昕..络合浸渍MgO改性MCM-22催化甲苯与碳酸二甲酯烷基化合成对二甲苯[J].石油化工,2012,41(3):277-282,6.基金项目
国家自然科学基金项目(21076027) （21076027）
江苏省自然科学基金项目(BK2011231) （BK2011231）
江苏省青蓝工程青年骨干教师项目. （）
