作　　者： ; ; ; ; ;

机构地区： 中国科学院大连化学物理研究所催化基础国家重点实验室

出　　处： 《催化学报》 2009年第10期1022-1028,共7页

摘　　要： 甲烷无氧芳构化(MDA)和甲烷水蒸气重整(MSR)的耦合反应可以大幅度提高甲烷无氧芳构化反应的稳定性.单独的甲烷无氧芳构化反应失活较快,甲烷转化率从0.5h的14.5%很快下降至15h的3.5%.而采用联合MSR/MDA反应体系,甲烷的转化率从12.5h的11.5%非常缓慢地下降至60h后的6.5%.MSR反应原位生成的CO和H2能降低反应中生成的CHx物种数量,减少催化剂上积炭的生成,进而延长反应时间.MSR反应过程中高比例H2的生成更能有效地减少与B酸相关的积炭的生成,从而更好地抑制反应的失活. The durability of methane dehydroaromatization （MDA） has been improved by its combination with methane steam reforming （MSR）. The methane conversion in the combined MSR/MDA system decreases very slowly from 11.5% at 12.5 h to 6.5% at 60 h, whereas it decreases rapidly from 14.5% at 0.5 h to 3.5% at 15 h for the MDA reaction alone. CO and H2produced in-situ through the MSR reaction may reduce the amount of CHx species during the reaction, which in turn reduces the formation of coke deposited on the catalyst, prolonging the durability of the MDA reaction. High content of H2 from the MSR process plays a major role in suppressing coke accumulation on the catalyst, especially the coke associated with the Bronsted acidic sites that are mainly responsible for the deactivation.

关 键 词： 甲烷无氧芳构化 甲烷水蒸气重整 反应耦合 钼 积炭

领　　域： [理学] [理学]