ZSM-5 zeolite membrane reactor was used in ethylbenzene dehydrogenation to styrene under the circumstances of commercial production.The experimental results indicated that the conversion of ethylbenzene in the membran...ZSM-5 zeolite membrane reactor was used in ethylbenzene dehydrogenation to styrene under the circumstances of commercial production.The experimental results indicated that the conversion of ethylbenzene in the membrane reactor increased with increasing pressure of the membrane tube.Using the inert sweep gas instead of vacuumizing, the result of long term steady operation under the same condition showed that the selectivity of styrene increased and the conversion of ethylbenzene in the membrane reactor increased by 7.52% in comparison with the fixed-bed reactor.展开更多
考察了铈及其前驱物对乙苯脱氢制苯乙烯催化剂性能的影响,并采用程序升温还原(TPR)、X 射线衍射(XRD)、扫描电子显微镜(SEM)、热重-差热分析(TG-DTA)和 X 射线能谱(EDAX)等技术对催化剂进行了表征。结果表明,不含铈的脱氢催化剂活性较低...考察了铈及其前驱物对乙苯脱氢制苯乙烯催化剂性能的影响,并采用程序升温还原(TPR)、X 射线衍射(XRD)、扫描电子显微镜(SEM)、热重-差热分析(TG-DTA)和 X 射线能谱(EDAX)等技术对催化剂进行了表征。结果表明,不含铈的脱氢催化剂活性较低,苯乙烯收率为53.8%。添加铈后,可以较大幅度地提高乙苯脱氢反应中苯乙烯的收率。不同的铈源会影响到催化剂表面的形貌、铈的分布和催化剂的抗还原性,其中以硝酸铈作为前驱物所得的催化剂具有较高的活性和选择性。CeO_2在脱氢反应条件下,部分被还原,可能与三价铁形成了新的活性中心。从而大幅度地提高了乙苯脱氢催化剂的活性。展开更多
文摘ZSM-5 zeolite membrane reactor was used in ethylbenzene dehydrogenation to styrene under the circumstances of commercial production.The experimental results indicated that the conversion of ethylbenzene in the membrane reactor increased with increasing pressure of the membrane tube.Using the inert sweep gas instead of vacuumizing, the result of long term steady operation under the same condition showed that the selectivity of styrene increased and the conversion of ethylbenzene in the membrane reactor increased by 7.52% in comparison with the fixed-bed reactor.
文摘考察了铈及其前驱物对乙苯脱氢制苯乙烯催化剂性能的影响,并采用程序升温还原(TPR)、X 射线衍射(XRD)、扫描电子显微镜(SEM)、热重-差热分析(TG-DTA)和 X 射线能谱(EDAX)等技术对催化剂进行了表征。结果表明,不含铈的脱氢催化剂活性较低,苯乙烯收率为53.8%。添加铈后,可以较大幅度地提高乙苯脱氢反应中苯乙烯的收率。不同的铈源会影响到催化剂表面的形貌、铈的分布和催化剂的抗还原性,其中以硝酸铈作为前驱物所得的催化剂具有较高的活性和选择性。CeO_2在脱氢反应条件下,部分被还原,可能与三价铁形成了新的活性中心。从而大幅度地提高了乙苯脱氢催化剂的活性。
