CIESC Journal ›› 2015, Vol. 66 ›› Issue (9): 3413-3420.DOI: 10.11949/j.issn.0438-1157.20150867

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Effects of MnOx supports on light olefin synthesis using cobalt catalyst in Fischer-Tropsch reaction

LIU Yi, LIU Yong, CHEN Jianfeng, ZHANG Yi   

  1. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2015-06-09 Revised:2015-06-16 Online:2015-09-05 Published:2015-09-05
  • Supported by:

    supported by the National Natural Science Foundation of China (2020619).

不同氧化锰载体对费托钴基催化剂合成低碳烯烃的影响

刘意, 刘勇, 陈建峰, 张燚   

  1. 北京化工大学有机无机复合材料国家重点实验室, 北京 100029
  • 通讯作者: 张燚
  • 基金资助:

    国家自然科学基金项目(2020619)。

Abstract:

A series of Co/MnOx catalysts were prepared by impregnation method to investigate the effects of MnOx supports on selectivity of light olefins (C2=-C4=). The various catalysts were characterized by XRD, SEM, TEM, TPR and DRIFTS. The TPR results showed that the Co/MnO and Co/Mn3O4 were more easy to be reduced. The DRIFTS results indicated that Co/MnO and Co/Mn3O4 had much more adsorbed CO, which improved high CO conversion. The more bridge-adsorbed CO on Co/Mn2O3 and Co/Mn3O4 catalysts would contribute to forming more CH2 species. The FTS results revealed that Co/MnO and Co/Mn3O4 had better activity, and Co/Mn2O3 and Co/Mn3O4 realized better selectivity of C2=-C4=. The Co/Mn3O4 reached the 50.91% selectivity of C2=-C4= and olefin to paraffin ratio (O/P) of 3.40 within C2-C4.

Key words: Fischer-Tropsch synthesis, syngas, Co/MnOx catalysts, fixed bed reactor, light olefins

摘要:

制备不同的Co/MnOx (Co/MnO、Co/MnO2、Co/Mn2O3、Co/Mn3O4) 催化剂,并利用XRD、SEM、TEM、BET、TPR、DRIFTS、XPS表征手段分析催化剂的理化性质,比较不同氧化锰载体对催化性能的影响,考察催化剂对低碳烯烃(C2=~C4=)的选择性影响。结果表明催化剂Co/MnO和Co/Mn3O4更容易还原,并且CO的吸附量较大,有利于实现较高的CO转化率;Co/Mn2O3和Co/Mn3O4中CO桥式吸附更高,有利于生成更多的-CH2-物种。综合考虑催化剂的活性和C2=~C4=选择性,Co/Mn3O4的费托合成(FTS)性能最好,其中C2=~C4=选择性为50.91%,烯烷比(O/P)为3.40。

关键词: 费托合成, 合成气, Co/MnOx催化剂, 固定床, 低碳烯烃

CLC Number: