负载杂多酸催化剂催化合成直链烷基苯的研究

Catalytic synthesis of linear alkylbenzene using supported heteropoly acid catalyst

在固定床反应器和一定的反应条件下 ,考察了改变苯烯摩尔比对负载杂多酸催化剂催化合成直链烷基苯的活性和选择性的影响。实验结果表明 ,随着苯烯比的增加 ,十二烯的转化率和 2位 十二烷基苯的选择性均有所增加。在苯烯摩尔比 4∶1、液体质量总空速 10h-1、温度 12 0℃和液固反应条件下 ,对催化剂的稳定性进行了实验考察 ,结果显示 ,连续反应 70h后 ,负载杂多酸催化剂的活性明显下降。利用SEM、FT IR和TG等对失活催化剂进行了基本表征 ,结果表明积炭可能是引起负载杂多酸催化剂失活的主要原因。

The influences of molar ratios of benzene to dodecene on catalytically synthesizing linear alkylbenzene using supported heteropoly acid catalyst was investigated at a fixed bed reactor and certain reaction conditions. It is showed that the conversion ratio of dodecene and the selectivity of producing 2-alkylbenzene are slightly increased with increasing molar ratio of benzene to dodecene, respectively. The catalyst stability was also investigated at the following reaction conditions. The molar ratio of benzene to dodecene was 4∶1, total liquid space velocity 10?h -1 , and the reaction temperature 120?℃. The results show that the catalyst activity is obviously decreased after it is undergone continuously 70?h reaction at the fixed bed reactor. The deactivated catalyst was characterized by SEM, FT-IR and TG. The results show that the probably reason resulting in the catalyst losing its activity is the polymers, which was produced during the alkylation process, deposited on the catalytic sites.