镁、铈复合改性的多级孔ZSM-5分子筛在苯和甲醇烷基化中的应用

以硝酸镁、硝酸铈为前躯物，考察镁单独改性和镁、铈复合改性对多级孔ZSM-5分子筛催化苯和甲醇烷基化反应性能的影响，并以镁、铈复合改性的多级孔ZSM-5分子筛为催化剂，考察工艺条件对苯和甲醇烷基化反应的影响。结果表明，在反应温度为773 K、质量空速为8 h-1、反应压力为0.18 MPa，n（甲醇）/n（苯）= 0.9的条件下，多级孔ZSM-5分子筛通过镁、铈复合改性后，苯的转化率达到51%以上，甲苯、二甲苯的选择性达到90%以上。寿命试验表明该催化剂连续运行400 h，稳定性良好，具有优良的工业应用价值。

MODIFICATION OF HIERARCHICAL ZSM-5 ZEOLITE WITH Mg AND Ce FOR METHYLATION OF BEZENE AND METHNOL

The influence of magnesium and cerium composite modification of hierarchical porous ZSM-5 on methylation of benzene with methanol was investigated. Magnesium nitrate and cerium nitrate were used as precursors. The effects of process conditions of the methylation were studied over the modified ZSM-5 catalyst. The results showed that at the conditions of 773K, 0.18 MPa, WHSV of 8 h-1, n（methanol）/n（benzene）= 0.9, the conversion rateof benzene was 51%, and the selectivity of toluene and xylene was greater than 90% over the Mg and Ce modified hierarchically ZSM-5. After 400 hours on stream, the catalysts still exhibited excellent stability, indicating its excellent industrial application value.