dc.contributor.author | Efstathiou, Angelos M. | en |
dc.contributor.author | Chafik, T. | en |
dc.contributor.author | Bianchi, D. | en |
dc.contributor.author | Bennett, C. O. | en |
dc.creator | Efstathiou, Angelos M. | en |
dc.creator | Chafik, T. | en |
dc.creator | Bianchi, D. | en |
dc.creator | Bennett, C. O. | en |
dc.date.accessioned | 2019-11-21T06:18:51Z | |
dc.date.available | 2019-11-21T06:18:51Z | |
dc.date.issued | 1994 | |
dc.identifier.uri | http://gnosis.library.ucy.ac.cy/handle/7/55438 | |
dc.description.abstract | The chemisorption of CO and hydrogenation of surface adsorbed carbon species formed after reaction of CO/He with Rh/MgO catalyst in the range 300-573 K were studied by transient methods employing both FTIR and mass spectroscopy in separate flow and reactor systems. Exposure of Rh/MgO to CO/He at 523 K results in a rapid formation of linear and bridged CO species. It was found that formation of gem-dicarbonyl CO species during CO chemisorption at 300 K is strongly affected by CO/He treatment at 523 K and H2 reduction conditions. Experiments with labelled CO (13CO and 18CO) indicate that linear and bridged CO species readily exchange with gaseous CO species. Transient hydrogenation results for adsorbed carbon-containing species formed after CO/He reaction at 523 K provide evidence that H2 chemisorption decreases after cycles of reaction in CO/He at 523 K followed by H2 reduction at 673 K. However, the surface coverages of adsorbed CO species are not affected by such treatments. Oxygen pretreatment of the catalyst at 623 K followed by H2 reduction, after CO/He reaction at 523 K, greatly affects the transient kinetics of hydrogenation of adsorbed CO species at 523 K but not their respective surface coverages. This result is related to a change in the hydrogen chemisorption sites by oxygen treatment which resulted in the removal of inactive carbon not hydrogenated at 723 K. A kinetic model for the hydrogenation of the various adsorbed carbon-containing species is proposed which accounts for the interpretation of the CH4 transient responses obtained. © 1994 Academic Press, Inc. | en |
dc.source | Journal of Catalysis | en |
dc.source.uri | https://www.scopus.com/inward/record.uri?eid=2-s2.0-0039757797&doi=10.1006%2fjcat.1994.1111&partnerID=40&md5=1eed94d5f4617d9d3cdfa75b3a7f0ec8 | |
dc.title | CO chemisorption and hydrogenation of surface carbon species formed after CO/He reaction on Rh/MgO: A transient kinetic study using FTIR and mass spectroscopy | en |
dc.type | info:eu-repo/semantics/article | |
dc.identifier.doi | 10.1006/jcat.1994.1111 | |
dc.description.volume | 147 | |
dc.description.issue | 1 | |
dc.description.startingpage | 24 | |
dc.description.endingpage | 37 | |
dc.author.faculty | 002 Σχολή Θετικών και Εφαρμοσμένων Επιστημών / Faculty of Pure and Applied Sciences | |
dc.author.department | Τμήμα Χημείας / Department of Chemistry | |
dc.type.uhtype | Article | en |
dc.description.notes | <p>Cited By :18</p> | en |
dc.source.abbreviation | J.Catal. | en |
dc.contributor.orcid | Efstathiou, Angelos M. [0000-0001-8393-8800] | |
dc.gnosis.orcid | 0000-0001-8393-8800 | |