甲醇在CeO_2担载Pd催化剂上分解机理的研究  

Studies on Mechanism of Methanol Decomposition over Pd/CeO_2 Catalyst

作　　者：杨成[1] 董庆年[1] 任杰[1] 孙予罕[1] 

机构地区：[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

出　　处：《高等学校化学学报》2002年第12期2329-2331,共3页Chemical Journal of Chinese Universities

基　　金：国家杰出青年基金 (批准号 :9746 0 9);山西省青年基金 (批准号 :9910 10 )资助

摘　　要：采用原位红外 ( in-situ FTIR)技术对甲醇在 Ce O2 和 Pd/ Ce O2 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 Ce O2 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 Ce O2 上促进了甲酸盐物种的分解 .Cl- 的存在加强了 Pd/ Ce O2 催化剂与氢的相互作用 ,Pd和 Ce O2 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 .The interaction between hydrogen and CeO 2 support and Pd/CeO 2 catalysts is characterized by TPR and H 2-TPD, while the adsorption and decomposition of methanol over CeO 2 and Pd/CeO 2 catalysts were studied by in-situ FTIR technique, then a new model of the mechanism for the methanol decomposition over Pd/CeO 2 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/CeO 2 catalyst, so a synergistic effect between Pd and CeO 2 was proved by their action of lattice oxygen and hydrogen.

关 键 词：CeO2担载Pd催化剂 分解机理 甲醇 钯 二氧化铈载体 

分 类 号：O623.411[理学—有机化学] O64[理学—化学]