Journal of Physical Chemistry p. 4542 - 4549 (1992)
Update date:2022-08-16
Topics:
Fu, Sabrina S.
Somorjai, Gabor A.
The interaction of methanol with Cu-Zn-O surfaces is studied on a model system produced by depositing zinc oxide islands on Cu(110) surfaces.Various amounts of oxygen are then adsorbed onto the exposed copper part of the surface to form ZnOx/y ML O/Cu(110) surfaces.The role of O/Cu(110) in methanol decomposition on our model Cu-Zn-O surfaces was discerned by examining the interaction of methanol, adsorbed at 150 K in ultrahigh vacuum, with these ZnOx/y ML O/Cu(110) surfaces using temperature-programmed desorption (TPD), low energy electron diffraction (LEED), and Auger electron spectroscopy (AES).Methanol reduces the zinc oxide and removes oxygen chemisorbed on copper.The decomposition temperatures of formate and methoxy species formed upon methanol decomposition on the components of oxygen covered Cu(110) and ZnOx are unaffected by the presence of the other component.However, the amount of formate species decomposed on the ZnOx component of ZnOx/O/Cu(110) surfaces is controlled by the amount of chemisorbed oxygen on copper.We show that there are cooperative effects between O/Cu and ZnO which increases the total amount of formate formed; for ZnOx/0.2 ML O/Cu(110) surfaces, the concentration of surface formate doubles on the three-component system as compared to the sum of the concentration of formate species on the separate components.This produces a change in the relative surface formate to methoxy ratio from 1:9, for the case of 0.2 ML O/Cu(110), to 1:3, for the case of ZnOx/0.2 ML O/Cu(110) surfaces.
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