高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (12): 2329.

• 研究论文 • 上一篇    下一篇

甲醇在CeO2担载Pd催化剂上分解机理的研究

杨成, 董庆年, 任杰, 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:2002-01-10 出版日期:2002-12-24 发布日期:2002-12-24
  • 通讯作者: 孙予罕(1963出生),男,博士,研究员,博士生导师,从事金属催化和纳米材料的基础和应用研究.E-mail:yh sun@sx icc.ac.cn E-mail:yhsun@sxicc.ac.cn
  • 基金资助:

    国家杰出青年基金(批准号:974609);山西省青年基金(批准号:991010)资助

Studies on Mechanism of Methanol Decomposition over Pd/CeO2 Catalyst

YANG Cheng, DONG Qing-Nian, REN Jie, SUN Yu-Han   

  1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
  • Received:2002-01-10 Online:2002-12-24 Published:2002-12-24

摘要: 采用原位红外(in-situFTIR)技术对甲醇在CeO2和Pd/CeO2催化剂上的吸附和反应进行了研究,提出一个新的甲醇分解反应机理模型.甲醇在CeO2上容易吸附并结合其晶格氧生成甲酸盐物种,而甲醇分解的产物氢被Pd活化后,溢流到CeO2上促进了甲酸盐物种的分解.Cl-的存在加强了Pd/CeO2催化剂与氢的相互作用,Pd和CeO2通过对氢和氧物种的作用对甲醇分解反应的过程表现出协同效应.

关键词: 甲醇分解, CeO2, Pd/CeO2, 反应机理

Abstract: The interaction between hydrogen and CeO2 support and Pd/CeO2 catalysts is characterized by TPR and H2-TPD, while the adsorption and decomposition of methanol over CeO2 and Pd/CeO2 catalysts were studied by in-situ FTIR technique, then a new model of the mechanism for the methanol decomposition over Pd/CeO2 catalyst was proposed. It was found that the lattice oxygen of CeO 2 was active towards oxidation of the adsorbed methanol to form formate species, which were then reduced by the hydrogen produced and activated on Pd. The anion Cl- promoted the interaction between hydrogen and Pd/CeO2 catalyst, so a synergistic effect between Pd and CeO2 was proved by their action of lattice oxygen and hydrogen.

Key words: Methanol decomposition, CeO2, Pd/CeO2, Reaction mechanism

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