Abstract
Adsorption and reaction of CO and CO2 were studied on oxygen-covered Au(997) surfaces by means of temperature- programmed desorption/reaction spectroscopy. Oxygen atoms (O(a)) on Au(997) enhances the CO2 adsorption and stabilizes the adsorbed CO2(a), and the stabilization effect also depends on the CO2(a) coverage and involved Au sites. CO2(a) desorption is the rate-limiting step for the CO+O(a) reaction to produce CO2 on Au(997) at 105 K and exhibits complex behaviors, including the desorption of CO2(a) upon CO exposures at 105 K and the desorption of O(a)-stabilized CO2(a) at elevated temperatures. The desorption of CO2(a) from the surface upon CO exposures at 105 K to produce gaseous CO2 depends on the surface reaction extent and involves the reaction heat-driven CO2(a) desorption channel. CO+O(a) reaction proceeds more easily with weakly-bound oxygen adatoms at the (111) terraces than strongly-bound oxygen adatoms at the (111) steps. These results reveal complex rate-limiting CO2(a) desorption behaviors during CO+O(a) reaction on Au surfaces at low temperatures which provide novel information on the fundamental understanding of Au catalysis.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
