摘要
CO_(2)加氢制备低碳烯烃是实现C1资源高值化利用的有效途径。为提高低碳烯烃选择性,以Fe-MOF为主体,对苯二甲酸为骨架配体,构建了金属比例可控的铁钴双金属催化剂(FeCo/MC),阐明了双金属的协同作用及金属比例对加氢性能的影响。发现Co的添加可以增加催化剂表面碱性位而显著地改善CO_(2)吸附,促进铁的碳化并通过费托反应的CO消耗促进逆水煤气反应。同时,适宜的铁钴比有助于改善金属间亲密度,从而通过合理串联活性位以获取最佳的低碳烯烃选择性和尽可能低的甲烷选择性,铁钴比为6时CO_(2)转化率为32.72%,低碳烯烃选择性最高达到37.14%。
The hydrogenation of CO2 on iron-based catalysts to produce light olefins is an effective way to realize the high-value utilization of C1 resources.To improve the selectivity of low-carbon olefins,Fe-MOF is used as the main body and terephthalic acid is used as the framework ligand to construct an iron-cobalt bimetallic catalyst(FeCo/MC)with a controllable metal ratio,which clarifies the synergistic effect of the bimetal and the effect of metal ratio on hydrogenation performance.It was found that the addition of Co can increase the basic sites on the catalyst surface to improve CO2 adsorption significantly,while it promoted the carbonization of iron and benefited the positive progress of the reverse water gas shift reaction(RWGS)through the CO consumption of the Fischer-Tropsch reaction(FTS)route.In addition,a suitable iron to cobalt ratio helped to improve the intermetallic intimacy,which can connect active sites reasonably and obtain the best light olefin selectivity and the CH4 selectivity as low as possible.The iron to cobalt ratio of 6 showed the highest light olefins selectivity(37.14%),and the CO2 conversion rate was 32.72%.
作者
董子超
吴玉
张博风
刘斯宝
刘国柱
赵杰
DONG Zichao;WU Yu;ZHANG Bofeng;LIU Sibao;LIU Guozhu;ZHAO Jie(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China;SINOPEC Research Institute of Petroleum Process,Beijing 100083,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2021年第5期2647-2656,共10页
CIESC Journal
基金
中国石化石油化工科学研究院资助项目。
关键词
催化剂
载体
烯烃
二氧化碳
加氢
铁物种
catalyst
support
olefins
carbon dioxide
hydrogenation
iron species
