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以硝酸镁为前驱体,通过等体积浸渍法制备不同负载量的MgO/HMCM-22催化剂.用X射线衍射、NH3程序升温脱附和吡啶吸附红外光谱表征催化剂的结构和酸性.在气相连续流动固定床反应器上考察了MgO负载量、反应温度、乙苯(EB)与碳酸二乙酯(DEC)摩尔比对EB与DEC烷基化反应合成对二乙苯(p-DEB)的影响.实验结果表明:B酸中心是EB与DEC烷基化反应的活性中心.随着MgO负载量的增加,EB转化率降低,而p-DEB选择性明显提高.采用12%MgO/HMCM-22为催化剂,在反应温度为360℃、n(EB)/n(DEC)=1∶2,p-DEB选择性高达64.4%.
The MgO / HMCM-22 catalysts with different loadings were prepared by the same volume impregnation method using magnesium nitrate as precursor.The structure and acidity of the catalysts were characterized by X-ray diffraction, NH3 temperature-programmed desorption and pyridine adsorption infrared spectroscopy.The gas- The effect of MgO loading, reaction temperature, molar ratio of ethylbenzene (EB) and diethyl carbonate (DEC) on the synthesis of p-DEB by EB and DEC reaction was investigated on a bed reactor. The results showed that the B acid center was the active center for the alkylation of EB and DEC. With the increase of MgO loading, the conversion of EB decreased and the selectivity of p-DEB increased obviously. With 12% MgO / HMCM-22 as catalyst The selectivity of p-DEB was 64.4% at n (EB) / n (DEC) = 1: 2 at the reaction temperature of 360 ℃.