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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | King, D. A. Horgan, A. M. |
| Copyright Year | 1971 |
| Abstract | The kinetics of the interaction of O2 with CO on Ni films under ultra-high vacuum conditions has been investigated utilizing an apparatus designed for sticking probability profile measurement. With it, absolute rates of adsorption, replacement and catalysis, and surface coverages in the reacting species were simultaneously measured. The results reveal marked differences in the chemical reactivity of the different binding states in the adlayer. The catalytic reaction of preadsorbed O2 with gaseous CO to form CO2 was found to proceed only when the coverage θ in the preadsorbed O2 layer was < ¼ monolayer. The catalytically active species β′-O2 is converted to a more tightly bound, inert species β-O2 at θO2 > ¼ monolayer, this transformation having a marked effect on the sticking probability profile for O2 on Ni.4 Reaction kinetics indicate that the β′-O2 state is non-dissociatively adsorbed. When gaseous O2 is introduced to Ni films with preadsorbed CO, the CO is efficiently and quantitatively displaced from the surface as Co and CO2. The strongly bound β-CO state yields CO2 and a more weakly bound α-CO state yields CO, both processes being preceded by a short induction period. Reaction mechanisms are proposed which are supported by infra-red data obtained from supported nickel-on-silica samples. The continuous catalytic reaction of CO with O2 to form CO2 to form CO2 over O2-presaturated Ni films was also examined, and a possible reaction mechanism is discussed. |
| Starting Page | 2145 |
| Ending Page | 2157 |
| Page Count | 13 |
| File Format | |
| ISSN | 00147672 |
| Volume Number | 67 |
| Journal | Transactions of the Faraday Society |
| DOI | 10.1039/TF9716702145 |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | Ultra-high vacuum Oxygen Adsorption Chemical kinetics Reaction mechanism |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physics and Astronomy Physical and Theoretical Chemistry Engineering |
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