Effects of pretreatment and promoter on iron-based catalysts for directly forming light olefins from syngas
Effects of pretreatment and promoter on iron-based catalysts for directly forming light olefins from syngas
复制标题
预处理和促进剂对合成气直接制低碳烯烃铁基催化剂的影响
DOI：
10.1007/s11144-014-0821-0
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Yi Zhang
中科院分区：
文献类型：
--
作者：
Liu Yi;Jian-Feng Chen;Yi Zhang
利用乙二醇改性的共沉淀作用，开发了一种具有较高低碳烯烃选择性和活性的费托合成催化剂。采用乙二醇（EG）改性共沉淀法制备的催化剂颗粒较小，粒径为15-25 nm，比常规共沉淀法制备的催化剂颗粒小1/2。与未预处理的催化剂相比，Fe/Mn-EG催化剂具有更高的活性和更高的低碳烯烃选择性，烯烃/烷烃比（C2=-C4=/C20-C40）提高了一倍。此外，镁助剂的加入抑制了Fe/Mn-EG催化剂的链增长能力，促进了低碳烯烃（C2=-C4=）的生成，低碳烯烃选择性高达50.1%。采用N2物理吸附、XRD、SEM、XPS、TPR和DRIFTS等测试手段对催化剂的结构、活性相、还原和碳化性能进行了表征。
The effects of ethylene glycol modified co-precipitation were applied to develop a catalyst with higher activity and selectivity of light olefins in the Fischer–Tropsch synthesis. The catalysts prepared by an ethylene glycol (EG) modified co-precipitation realized smaller and homogeneously distributed catalyst particles as 15–25 nm, which was two times smaller than that of the catalyst prepared from conventional co-precipitation. The Fe/Mn-EG catalyst has higher activity and enhanced selectivity to light olefins, as well as the doubled olefin to paraffin ratio (C2=–C4=/C20–C40), comparing to un-pretreated catalyst. Furthermore, the addition of magnesium promoter to the Fe/Mn-EG catalyst inhibits the chain growth ability, and enhances the formation of light olefins (C2=–C4=), realizing the high selectivity of light olefins as 50.1 %. The properties of catalyst structure, active phase, reduction and carburization of obtained catalysts were characterized by N2physisorption, XRD, SEM, XPS, TPR and DRIFTS measurements.