CO Adsorption and Hydrogenation on Crystalline YBa2Cu3O(x) Thin Films
- 化学化工－已发表论文 
YBa2Cu3Ox(YBCO, x=6-7) thin films have been prepared on the YSZ substracts 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 Cu-0, and the orthorhombic structure of YBCO is transformed to the tetragonal phase. The oxygen vacancies are in favor of adsorption of CO, CO2 and H-2. 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.