物理化学学报 >> 2003, Vol. 19 >> Issue (05): 423-427.doi: 10.3866/PKU.WHXB20030509

研究论文 上一篇    下一篇

Mn助剂对CuFeZrO2低碳醇合成催化剂的修饰作用

徐润;马中义;杨成;魏伟;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:2002-08-30 修回日期:2002-11-28 发布日期:2003-05-15
  • 通讯作者: 孙予罕 E-mail:yhsun@sxicc.ac.cn

Effect of Manganese Promoter on the CuFeZrO2 Catalyst for Higher Alcohols Synthesis

Xu Run;Ma Zhong-Yi;Yang Cheng;Wei Wei;Sun Yu-Han   

  1. State Key Laboratory of Coal Conversion, Institute of Coal Chmeistry, Chinese Academy of Sciences, Taiyuan 030001
  • Received:2002-08-30 Revised:2002-11-28 Published:2003-05-15
  • Contact: Sun Yu-Han E-mail:yhsun@sxicc.ac.cn

摘要: 利用程序升温还原和原位漫反射红外光谱技术研究了Mn修饰的CuFeZrO2催化剂的结构特性,并测试了催化剂的CO加氢合成低碳醇的反应性能.研究表明,适量添加锰助剂有利于提高催化剂的反应活性,提高产物中C2+醇的含量,抑制甲烷的生成,但随锰含量的增加催化剂的活性和选择性呈现先增加后下降的趋势.程序升温还原的测试表明,锰助剂通过与铜的相互作用使铜的还原变得困难,影响铜在催化剂上的状态,随锰的加入量的增加这种作用得到加强.铜分散度的测定表明锰促进了铜的分散,利用探针分子CO在催化剂上吸附的漫反射红外光谱研究发现,锰助剂可以提高组分间的相互作用,影响铜的电子性质,从而增加了CO在铜上的吸附.

关键词: 低碳醇合成, CuFeZrO2催化剂, 锰助剂, 助剂作用

Abstract: Various Mn-modified CuFeZrO2 catalysts for higher alcohols synthesis were characterized and tested by TPR, DRIFT, CO hydrogenation and reactive chemisorption of N2O.It was found that suitable addition of Mn could improve the catalytic activity and C2+ alcohols selectivity and suppress the formation of methane. TPR results showed that the reduction of CuO in CuMnFeZrO2 catalyst became more difficult because of the interaction between Cu and Mn. And such interaction proceeded stronger with the amount of Mn increased. This fact is correlated with the change of Cu surface areas and dispersion. In situ DRIFT displayed CO adsorption on the CuMnFeZrO2 catalysts. It was also shown that the interaction between Cu and Mn had occurred, the CO adsorption on the catalysts was increased and blue shifted.

Key words: Higher alcohol synthesis, CuFeZrO2 catalyst, Manganese promoter, Effect of promoter