物理化学学报 >> 2002, Vol. 18 >> Issue (03): 260 -263 .doi: 10.3866/PKU.WHXB20020314

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锰助剂对F-T合成Co/Al2O3催化剂反应性能的影响

张俊岭;任杰;陈建刚;孙予罕   

  1. 中国科学院山西煤炭化学研究所 煤转化国家重点实验室,太原 030001
  • 收稿日期:2001-07-17 修回日期:2001-10-15 发布日期:2002-03-15
  • 通讯作者: 孙予罕 E-mail:yhsun@sixcc.ac.cn

Effect of Manganese Promoter on the Performance of Co/Al2O3 Catalysts for FischerTropsch Synthesis

Zhang Jun-Ling;Ren Jie;Chen Jian-Gang;Sun Yu-Han   

  1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001
  • Received:2001-07-17 Revised:2001-10-15 Published:2002-03-15
  • Contact: Sun Yu-Han E-mail:yhsun@sixcc.ac.cn

摘要: 采用程序升温和原位红外技术对锰改性Co/Al2O3催化剂进行了表征,并与CO加氢反应活性和选择性进行关联.结果表明,添加适量锰能够增加反应活性,提高烃选择性,抑制甲烷及低碳烃的生成. XRD和FTIR结果表明锰助剂的添加能够促进活性相的分散,促进桥式CO吸附位数的增加. H2TPD表明锰的加入可增加低温吸附氢量,但吸附氢量随锰含量的增加而减少.钴基催化剂的费托合成反应性能可以用锰添加导致的CO吸附态物种的变化来解释.

关键词: 费-托合成, Co/Al2O3催化剂, 锰助剂, 载体, 表征

Abstract: The Mnmodified cobalt catalysts for FischerTropsch(FT) synthesis were characterized and tested by TPR, H2TPD, FTIR, and CO hydrogenation. It was found that a suitable addition of manganese could improve the catalytic activity and selectivity and suppress the methane and C24 hydrocarbons. XRD and FTIR results showed that the presence of Mn could improve the dispersion of active phases and favor the formation of bridgedtype adsorbed CO. A small amount of Mn could increase the uptake of hydrogen, but excess of manganese might decrease the uptake of hydrogen. Such a shift of the reaction performances was related to the change of adsorbed CO species.

Key words: Foscjer-Tropsch(F-T) synthesis, Co/Al2O3 catalysts, Mn promoter, Supporter, Characterization