Abstract HZSM-5@silicalite-1 catalysts were prepared by the hydrothermal method, and the structure, morphology, acidity and pore texture of core–shell catalysts were studied by XRD, SEM, TEM, NH 3 -TPD, Py-IR and N 2 adsorption/desorption isotherms in detail. Their catalytic performances were tested in the alkylation reaction of toluene with methanol. The results showed that a coating layer was formed in the form of silicalite-1 on HZSM-5. NH 3 -TPD measurements indicated that HZSM-5@silicalite-1 contained less strong acid sites but more weak acid sites than the parent HZSM-5. The selectivity of p -xylene for toluene alkylation was approximately linear with the percentage of weak acid in total acid. Under the optimal reaction conditions, the conversion of toluene was 34.15%, and the selectivity of p -xylene was 96.77%. Graphic Abstract

中文翻译：

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核壳HZSM-5@silicalite-1复合材料：甲苯与甲醇烷基化的可控合成及催化性能

摘要 采用水热法制备了 HZSM-5@silicalite-1 催化剂，并通过 XRD、SEM、TEM、NH 3 -TPD、Py-IR 和 N 研究了核壳催化剂的结构、形貌、酸度和孔结构。 2 吸附/解吸等温线的详细信息。在甲苯与甲醇的烷基化反应中测试了它们的催化性能。结果表明，在HZSM-5上形成了硅沸石-1形式的涂层。NH 3 -TPD 测量表明，与母体 HZSM-5 相比，HZSM-5@silicalite-1 包含较少的强酸位点但更多的弱酸位点。对二甲苯对甲苯烷基化的选择性与弱酸占总酸的百分比近似线性。在最佳反应条件下，甲苯转化率为34.15%，对二甲苯选择性为96.77%。图形摘要