石油化工2024，Vol.53Issue(12)：1704-1711,8.DOI:10.3969/j.issn.1000-8144.2024.12.002
铁钾基复合氧化物上CO2氧化乙苯脱氢制苯乙烯的原位DRIFTS研究
In situ DRIFTS investigation of ethylbenzene oxidative dehydrogenation for styrene with CO2 over Fe-K mixed oxide catalysts
曾铁强 1查凯文 1王晨宇 1张征湃 1宋磊 1缪长喜1
作者信息
- 1. 中石化(上海)石油化工研究院有限公司,上海 201208
- 折叠
摘要
Abstract
The composite oxide catalysts Fe-K,Fe-K-Ce and Fe-K-Ce-Mo were prepared by the wet granulation method.In situ diffuse reflectance infrared Fourier transform spectroscopy were performed to investigate the reaction mechanism,promotional effects and structure-activity relationship of catalysts in ethylbenzene oxidative dehydrogenation to styrene reactions in the presence of CO2.The experimental results show that the Ce addition improved catalytic activity for Fe-K catalysts,and the Mo modification increased styrene selectivity.The modified catalysts promoted carbonate species formation,Fe-K-Ce and Fe-K-Ce-Mo catalysts formed more bridged and bidentate carbonate species respectively.These carbonate species would decompose and desorb CO2,and release active sites under high temperature,then ethylbenzene would be adsorbed on these sites and dehydrogenate to generate styrene and H2,and then H2 was available to react with CO2 from carbonate species or gas phase CO2 via the reverse water gas reaction.Furthermore,after CO2 introduction,the activation induction periods of all catalysts were shortened and styrene production was improved.关键词
乙苯/脱氢/苯乙烯/二氧化碳/原位漫反射傅里叶变换红外光谱Key words
ethylbenzene/dehydrogenation/styrene/carbon dioxide/in situ diffuse reflectance infrared Fourier transform spectroscopy分类
化学化工引用本文复制引用
曾铁强,查凯文,王晨宇,张征湃,宋磊,缪长喜..铁钾基复合氧化物上CO2氧化乙苯脱氢制苯乙烯的原位DRIFTS研究[J].石油化工,2024,53(12):1704-1711,8.
