物理化学学报 >> 1997, Vol. 13 >> Issue (08): 700-705.doi: 10.3866/PKU.WHXB19970805

研究论文 上一篇    下一篇

CO在YBa2Cu3Ox薄膜上吸附与加氢的研究

李基涛,高利珍,张伟德   

  1. 厦门大学化学系，物理化学研究所，厦门 361005
  • 收稿日期:1996-12-17 修回日期:1997-03-04 发布日期:1997-08-15
  • 通讯作者: 李基涛

CO Adsorption and Hydrogenation on Crystalline YBa2Cu3Ox Thin Films

Li Ji-Tao,Gao Li-Zhen,Zhang Wei-De   

  1. Department of Chemistry,Institute of Physical Chemistry,Xiamen University,Xiamen 361005
  • Received:1996-12-17 Revised:1997-03-04 Published:1997-08-15
  • Contact: Li Ji-Tao

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摘要：

YBa2Cu3Ox（x＝6－7）薄膜被合成在YSZ基底上，用FTIR，XPS，XRD等手段原位研究CO在薄膜上的吸附及加氢行为．CO吸附在Cu位置上，与YBCO体相中的O作用，生成表面CO2或-COO基团，导致YBCO中产生氧空位，使YBCO发生晶型转变，Cu2＋被还原为Cu＋或Cu0．YBCO中的氧空位有利于CO、CO2及H2的吸附．CO、CO2在YBCO膜上的加氢产物为CH3OH、CH3OCH3和微量甲烷，反应中间体可能为甲酸盐、醛基和甲氧基等．

关键词: YBa2Cu3Ox膜, 甲醇和成, 反应中间态

Abstract:

YBa2Cu3Ox(YBCO, x=6-7) thin films have been prepared on the YSZ substrate and studied for CO adsorption and hydrogenation by using XPS, XRD, and in-situ FTIR. The results showed that CO adsorption occured at Cu sites and react with the oxygen species in YBCO, resulting in the formation of adsorbed CO2 or -COO bonding species and oxygen vacancies in YBCO, therefore, the Cu2+ ions of YBCO are reduced to Cu+ or Cu0, and the orthorhombic structure of YBCO is transformed to the tetragonal phase. The oxygen vacancies are in favor of adsorption of CO, CO2, and H2. The main products of CO, CO2 hydrogenation are found to be CH3OH,CH3OCH3 and a trace of CH4, and the reaction intermediates might be aldehyde, formate and methoxy radical.

Key words: YBa2Cu3Ox thin film, Methanol synthesis, Intermediates