dc.contributor.author | Kalamaras, Christos M. | en |
dc.contributor.author | Olympiou, G. G. | en |
dc.contributor.author | Efstathiou, Angelos M. | en |
dc.creator | Kalamaras, Christos M. | en |
dc.creator | Olympiou, G. G. | en |
dc.creator | Efstathiou, Angelos M. | en |
dc.date.accessioned | 2019-11-21T06:19:35Z | |
dc.date.available | 2019-11-21T06:19:35Z | |
dc.date.issued | 2008 | |
dc.identifier.uri | http://gnosis.library.ucy.ac.cy/handle/7/55603 | |
dc.description.abstract | Steady-state isotopic transient kinetic analysis (SSITKA) experiments coupled with in situ DRIFTS and mass spectrometry (operando) were performed for the first time to study essential mechanistic aspects of the water-gas shift reaction (WGSR) over a 0.5 wt.% Pt/γ-Al2O3 catalyst. The chemical structure of active and inactive reaction intermediate species present in the carbon-path ("C-path") from CO to the CO2 product gas (use of 13CO) and in the hydrogen-path ("H-path") from H2O to the H2 product gas (use of D2O) of the reaction mechanism were determined. In addition, the concentrations (μmol/g) of active species in both the "C-path" and "H-path" of the WGSR at 350 °C were measured. Based on the large concentration of active species present in the "H-path" (OH/H located on the alumina support), the latter being larger than 28 equivalent monolayers of the exposed Pt metal surface, the small concentration of OH groups along the periphery of metal-support interface, and the significantly smaller concentration (μmol/g) of active species present in the "C-path" (adsorbed CO on Pt and COOH species on the alumina support and/or the metal-support interface), it might be suggested that diffusion of OH/H species on the alumina support surface towards Pt catalytic sites present in the "H-path" of reaction (back-spillover process) might be considered as a slow reaction step. The latter process was evidenced after conducting the WGS reaction (CO/H2O) in a partially deuterated alumina surface (Pt/γ-Al2O3). At least two kinds of formate (-COOH) species residing on the alumina surface have been identified, one of which was active and leads to the formation of CO2(g) and H2(g), whereas the other kind(s) is/are considered as inactive (spectator) adsorbed reaction intermediate species. © 2008 Elsevier B.V. All rights reserved. | en |
dc.source | Catalysis Today | en |
dc.source.uri | https://www.scopus.com/inward/record.uri?eid=2-s2.0-53449098283&doi=10.1016%2fj.cattod.2008.06.010&partnerID=40&md5=a15f5ef9e5938b66a5fa5113daac5b5c | |
dc.subject | Mass spectrometry | en |
dc.subject | Fourier transform infrared spectroscopy | en |
dc.subject | Catalyst activity | en |
dc.subject | High performance liquid chromatography | en |
dc.subject | Supported-Pt catalyst | en |
dc.subject | Water-gas shift reaction | en |
dc.subject | SSITKA | en |
dc.subject | Catalytic reaction mechanisms | en |
dc.subject | DRIFTS | en |
dc.subject | Operando catalytic studies | en |
dc.subject | Water analysis | en |
dc.title | The water-gas shift reaction on Pt/γ-Al2O3 catalyst: Operando SSITKA-DRIFTS-mass spectroscopy studies | el |
dc.type | info:eu-repo/semantics/article | |
dc.identifier.doi | 10.1016/j.cattod.2008.06.010 | |
dc.description.volume | 138 | |
dc.description.issue | 3-4 | |
dc.description.startingpage | 228 | |
dc.description.endingpage | 234 | |
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 :46</p> | en |
dc.source.abbreviation | Catal Today | en |
dc.contributor.orcid | Efstathiou, Angelos M. [0000-0001-8393-8800] | |
dc.contributor.orcid | Kalamaras, Christos M. [0000-0001-6809-5948] | |
dc.gnosis.orcid | 0000-0001-8393-8800 | |
dc.gnosis.orcid | 0000-0001-6809-5948 | |