Shape-Selective Alkylation of Toluene with Dimethyl Carbonate into p-Xylene Over MgO/MCM-22 Prepared by a Novel Pre-impregnation Method
Shape-Selective Alkylation of Toluene with Dimethyl Carbonate into p-Xylene Over MgO/MCM-22 Prepared by a Novel Pre-impregnation Method
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DOI：
10.1007/s10562-023-04289-z
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发表时间：
2023-02
影响因子：
2.8
通讯作者：
Zhe Wen;Fei Cao;Jia-Bao Liu;Bing Xue
中科院分区：
文献类型：
--
作者：
Zhe Wen;Fei Cao;Jia-Bao Liu;Bing Xue
采用新型预浸渍法制备了MgO/MCM-22催化剂，考察了其催化甲苯与碳酸二甲酯选择性烷基化制对二甲苯的性能。表征结果表明，MCM-22外表面的Brønsted酸性位点被合成的MgO有效覆盖，而不影响正弦通道内的酸性位点，预浸渍法有效调节了内部孔入口。制备的MgO/MCM-22（PI）催化剂具有相对的准选择性，但甲苯转化率远高于MgO改性MCM-22催化剂。10% MgO/MCM-22（PI）催化剂表现出最佳的形状选择性能，合成的MgO高度均匀分散。图形抽象
The MgO/MCM-22 catalysts were prepared by a novel pre-impregnation method and their catalytic performances for the shape-selective alkylation of toluene with dimethyl carbonate into p-Xylene were investigated. Characterization results indicated that the Brønsted acid sites on the external surface of MCM-22 were efficiently covered by the as synthesized MgO without influencing the inner acidic sites in the sinusoidal channels and the internal pore entrance was efficiently adjusted by the pre-impregnation method. The as prepared MgO/MCM-22(PI) catalysts exhibited comparative para-selectivity but much higher toluene conversion than those over MgO-modified MCM-22 catalysts by general impregnation. The 10% MgO/MCM-22(PI) catalyst exhibited the best shape-selective performance for the highly uniform dispersion of the as synthesized MgO.Graphical Abstract