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Acta Physico-Chimica Sinica  1997, Vol. 13 Issue (08): 700-705    DOI: 10.3866/PKU.WHXB19970805
Article     
CO Adsorption and Hydrogenation on Crystalline YBa2Cu3Ox Thin Films
Li Ji-Tao,Gao Li-Zhen,Zhang Wei-De
Department of Chemistry,Institute of Physical Chemistry,Xiamen University,Xiamen 361005
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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 wordsYBa2Cu3Ox thin film      Methanol synthesis      Intermediates     
Received: 17 December 1996      Published: 15 August 1997
Corresponding Authors: Li Ji-Tao   
Cite this article:

Li Ji-Tao,Gao Li-Zhen,Zhang Wei-De. CO Adsorption and Hydrogenation on Crystalline YBa2Cu3Ox Thin Films. Acta Physico-Chimica Sinica, 1997, 13(08): 700-705.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB19970805     OR     http://www.whxb.pku.edu.cn/Y1997/V13/I08/700

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