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

doi:10.11949/j.issn.0438-1157.20150867

Abstract

Abstract:

A series of Co/MnO_x catalysts were prepared by impregnation method to investigate the effects of MnO_x 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/Mn₂O₃and Co/Mn₃O₄realized better selectivity of C₂⁼-C₄⁼. The Co/Mn₃O₄reached 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/MnO_x catalysts, fixed bed reactor, light olefins

摘要：

制备不同的Co/MnO_x (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/MnO_x催化剂, 固定床, 低碳烯烃

CLC Number:

TQ028.1

LIU Yi, LIU Yong, CHEN Jianfeng, ZHANG Yi. Effects of MnO_x supports on light olefin synthesis using cobalt catalyst in Fischer-Tropsch reaction[J]. CIESC Journal, 2015, 66(9): 3413-3420.

刘意, 刘勇, 陈建峰, 张燚. 不同氧化锰载体对费托钴基催化剂合成低碳烯烃的影响[J]. 化工学报, 2015, 66(9): 3413-3420.

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

不同氧化锰载体对费托钴基催化剂合成低碳烯烃的影响

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