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首页> 外文期刊>Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications >Effects of SiO_2/Al_2O_3,MgO modification and hydrothermal treatment on the catalytic activity of HZSM-5 zeolites in the methylation of 4-methylbiphenyl with methanol
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Effects of SiO_2/Al_2O_3,MgO modification and hydrothermal treatment on the catalytic activity of HZSM-5 zeolites in the methylation of 4-methylbiphenyl with methanol

机译：SiO_2 / Al_2O_3，MgO的改性和水热处理对HZSM-5分子筛在甲醇甲基化4-甲基联苯中催化活性的影响

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摘要

The objective of this work is to study the effects of SiO_2/Al_2O_3 of HZSM-5,MgO modification and hydrothermal treatment on methylation of 4-methylbiphenyl (4-MBP) with methanol under fixed-bed down-flow conditions.The results show that,with an increase in the SiO_2/Al_2O_3 of HZSM-5 (from 50 to 150,molar ratio),the selectivity to 4,4/-dimethylbiphenyl (4,4'-DMBP) increases from 25 to 79%.MgO modification also increases the selectivity to 4,4'-DMBP,but leads as well to low catalyst activity and rapid deactivation.Hydrothermal treatment not only increases the selectivity,but also improves the stability.When CBV1502 (SiO_2/Al_2O_3=150) catalyst was hydrothermally treated at 500 deg C,the selectivity to 4,4'-DMBP increased to 85%.The selectivity to 4,4'-DMBP was further improved to about 90% by the increasing in the amount of mesitylene in the feed as solvent.
机译：这项工作的目的是研究HZSM-5的SiO_2 / Al_2O_3，MgO的改性以及水热处理对固定床向下流动条件下甲醇对4-甲基联苯（4-MBP）甲基化的影响。 ，随着HZSM-5的SiO_2 / Al_2O_3的增加（从50到150，摩尔比），对4,4 /-二甲基联苯（4,4'-DMBP）的选择性从25％上升到79％。MgO改性CBV1502（SiO_2 / Al_2O_3 = 150）进行水热处理时，水热处理不仅提高了选择性，而且提高了稳定性，但选择性提高了对4,4'-DMBP的选择性，但同时导致催化剂活性降低和失活迅速。在500摄氏度时，对4,4'-DMBP的选择性提高到85％。通过增加进料中作为溶剂的均三甲苯的含量，对4,4'-DMBP的选择性进一步提高到约90％。

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