高等学校化学学报

高等学校化学学报 ›› 1981, Vol. 2 ›› Issue (2): 225.

• 论文 • 上一篇    下一篇

用脉冲色谱法研究Pd-V2O5体系催化剂的吸附作用

吴志芸, 郭海忱, 李敏学, 赵仲清   

  1. 吉林大学化学系催化动力学研究室
  • 收稿日期:1980-05-08 出版日期:1981-04-24 发布日期:1981-04-24

THE CHROMATOGRAPHIC INVESTIGATION ON ADSORPTION OF ETHYLENE ON Pd-V SYSTEM CATALYSTS

Wu Zhiyun, Guo Heichen, Li Minxue, Zhao Zhongqing   

  1. Catalysis and Kinetics Research Section of Department of Chemistry, Jilin University, Changchun
  • Received:1980-05-08 Online:1981-04-24 Published:1981-04-24

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摘要： 本文用脉冲色谱法测定了Pd-V氧化物体系催化剂对乙烯、氧和二氧化碳的吸附作用。指出在接近反应温度下(80—100°C),Pd-V氧化物体系的催化剂对乙烯有可逆与不可逆两种吸附作用,而单独的PdO和V2O5以及载体SiO2则只有可逆吸附作用。测定了不同温度下可逆吸附等温线,计算了吸附热,考查了不可逆吸附与催化剂中Pd含量之间的关系,指出在Pd-V氧化物催化剂上,乙烯的不可逆吸附量与催化氧化活性一样,是与Pd含量有关的。测定了预吸附氧有利于乙烯的不可逆吸附,而CO2则不能牢固的吸附在催化剂表面上。

Abstract: The adsorption properities of ethlene on Pd-V-Ti-Mo oxide/SiO2 and Pd-Voxide/SiO2, V2O5/SiO2, PdO/SiO2, SiO2 were investigated by pulse chromatography.On both Pd-V-Ti-Mo oxide/SiO2 and pd-Voxide/SiO2 catalysts the irreversible adsorption and reversible adsorption of ethylene were measured respectively. The reversible adsorption in our experimental conditions does not play a direct role in oxidation reaction.No irreversible adsorption of ethylene on PdO/SiO2, V2O5/SiO2 and SiO2 was exhibited. However, the irreversible adsorption of ethylene on Pd-V-Ti-Mo oxide/SiO2 and Pd-Voxide/SiO2 was very obvious. It is also shown that the amount of irreversible adsorbed ethylene on Pd-V-Ti-Mo oxide/SiO2 catalyst containing 0.05% Pd and its correlated activity of oxidation were all the highest. So the authors consider that there is a direct relationship between irreversible adsorption and the reactivity of selective oxidation of etylene, and the active centers are, perhaps, caused by Pd-Vconbination.The active surface area was calculated and the effect of preadsorbed oxygen on chemisorption of ethylone was examined By-product (CO2) does not make catalysts poisoned.

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