MCM-22 was synthesized by using silicic acid powder as a silica source under the static hydrothermal condition and characterized by X-ray diffraction, nitrogen adsorption-desorption isotherms, scanning electron microscopy, inductively coupled plasma optical emission spectrometry, and temperature-programmed desorption of ammonia. The liquid phase benzylation of benzene with benzyl alcohol to diphenylmethane was investigated over H-MCM-22. The effects of reaction parameters on the conversion of benzyl alcohol and product distribution were determined. Under optimal reaction conditions, diphenylmethane yield of 92.1% was achieved for 99.3% conversion of benzyl alcohol in 3 h of reaction period. The reusability of the catalyst was also investigated after calcination of the catalyst in stagnant air at 500 °C for 4 h. The results show that the organic species produced during the reaction deposited in the catalyst lead to the deactivation of the catalyst and the calcination of the deactivated catalyst causes catalyst dealumination.

中文翻译：

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H-MCM-22上苯与苄醇的弗瑞德-克拉夫茨烷基化反应

MCM-22是在静态水热条件下，以硅酸粉末为二氧化硅源合成的，并通过X射线衍射，氮吸附-解吸等温线，扫描电子显微镜，电感耦合等离子体发射光谱法和程序升温脱附法对其进行表征。氨。在H-MCM-22上研究了苯与苯甲醇的液相苄基化反应生成二苯甲烷。确定了反应参数对苯甲醇转化率和产物分布的影响。在最佳反应条件下，反应3小时内苯甲醇转化率为99.3％，二苯甲烷收率为92.1％。在停滞的空气中于500°C煅烧催化剂4小时后，还研究了催化剂的可重复使用性。