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首页> 外文期刊>Catalysis Today >Comparative study of zeolite catalyzed alkylation of benzene with alcohols of different chain length: H-ZSM-5 versus mordenite
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Comparative study of zeolite catalyzed alkylation of benzene with alcohols of different chain length: H-ZSM-5 versus mordenite

机译：沸石与不同链长的醇对苯的烷基化反应的比较研究：H-ZSM-5与丝光沸石

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Alkylation of benzene with light alcohols offers opportunities for a more environmental friendly gasoline by removing considerable portions of benzene. The performances of ZSM-5 and mordenite zeolites as catalysts were tested in the alkylation reaction of benzene with different light alcohols (methanol, ethanol and isopropanol). The experiments were carried out in a fluidized-bed reactor with a 1/1 mol ratio of benzene/alcohol at 200, 250, 300, 350 and 400°C for 3, 5, 7,10, 13,15 and 20s. The reaction temperature, nature of the alcohol molecule and the Br0nsted to Lewis acid ratio of the catalysts, play an important role in the alkylation reactions. For benzene alkylation with methanol to toluene and xylene (XY), both mordenite and ZSM-5 are active and selective catalysts, while for benzene ethylation to ethyl-benzene (EB), ZSM-5 exhibits higher EB selectivity than mordenite. Isopropanol presents higher difficulty to be activated as compared with other alcohols at the higher temperature, while the lower temperature favors benzene isopropylation to cumene over both catalysts. By studying the alkylation of benzene with alcohols of different chain length, it has been found that as the alkyl size (i.e. methyl, ethyl, and propyl) increases, the optimum temperature for alkylation reaction decreases.
机译：苯与轻质醇的烷基化可以通过去除大量苯来提供更环保的汽油。在苯与不同轻质醇（甲醇，乙醇和异丙醇）的烷基化反应中，测试了ZSM-5和丝光沸石作为催化剂的性能。实验是在流化床反应器中于200、250、300、350和400°C下以1/1摩尔比的苯/醇进行的3、5、7、10、13、15和20s。反应温度，醇分子的性质以及催化剂的布朗斯台德酸与路易斯酸之比在烷基化反应中起重要作用。对于用甲醇将苯烷基化为甲苯和二甲苯（XY），丝光沸石和ZSM-5都是活性和选择性催化剂，而对于将苯乙基化为乙基苯（EB）的产品，ZSM-5的发光选择性高于丝光沸石。与在高温下的其他醇相比，异丙醇具有更高的活化难度，而在两种催化剂上，较低的温度更有利于苯异丙基化为异丙基苯。通过研究苯与不同链长的醇的烷基化反应，发现随着烷基尺寸（即甲基，乙基和丙基）的增加，烷基化反应的最佳温度降低。

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