物理化学学报 >> 1998, Vol. 14 >> Issue (03): 219-225.doi: 10.3866/PKU.WHXB19980306

研究论文 上一篇    下一篇

甲醇、水及乙烯在氧化铌薄膜上吸附行为研究

仲崇民 , 王德峥, Takashi Ushikubo, Keisuke Wada   

  1. 中国科学院大连化学物理研究所 催化基础国家重点实验室,大连 116023|Mitsubishi chemical Corporation,Yokohama Research Center,1000,Kamoshida,Aoba-ku,Yokohama 227,Japan
  • 收稿日期:1997-05-19 修回日期:1997-09-27 发布日期:1998-03-15
  • 通讯作者: 王德峥

The Adsorption of Methanol,Water and Ethylene on a Niobium Oxide Thin Film

Zhong  Chong-Min, Wang-De-Zheng, Takashi  Ushikubo, Keisuke  Wada   

  1. State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,P.O.Box 110,Dalian 116023|Mitsubishi chemical Corporation,Yokohama Research Center,1000,Kamoshida,Aoba-ku,Yokohama 227,Japan
  • Received:1997-05-19 Revised:1997-09-27 Published:1998-03-15
  • Contact: Wang De-Zheng

摘要:

由Nb(110)氧化制得均匀的氧化铌薄膜,用紫外光电子能谱表征了在不同温度下,甲醇、水及乙烯在该薄膜上的吸附行为.结果表明,在氧化铌表面吸附甲醇、水和乙烯,在140K时,是非解离吸附,一般由化学吸附到物理吸附.在室温时都发生解离吸附.表面缺陷位活性最强,不仅优先被吸附,而且对吸附质的影响也比较大.氧化铌薄膜表面的Nb5+是主要吸附中心,但表面气离子也是一种吸附位.

关键词: 氧化铌薄膜, 吸附, 甲醇, 水, 乙烯, 紫外光电子能谱

Abstract:

 A niobium oxide thin film was obtained by oxidizing Nb(110). UPS was used to characterize the adsorption of methanol, water and ethylene on this film at different temperatures. The results show that at 140K, methanol and water chemisorb associatively at all coverages, while ethylene chemisorbs at low coverages and physisorbs at high coverages. At 300K, these molecules adsorb dissociativelly. The adsorption on surface defect centers is stronger: molecules are adsorbed on these sites first, and are also more affected by the adsorption. Nb5+ is the main adsorption centers on the surface, but oxygen ions on the surface are also adsorption centers.

Key words: Niobium oxide, Thin film, Adsorption, Methanol, Water, Ethylene