dc.contributor.author | Petallidou, Klito C. | en |
dc.contributor.author | Kalamaras, Christos M. | en |
dc.contributor.author | Efstathiou, Angelos M. | en |
dc.creator | Petallidou, Klito C. | en |
dc.creator | Kalamaras, Christos M. | en |
dc.creator | Efstathiou, Angelos M. | en |
dc.date.accessioned | 2019-11-21T06:22:14Z | |
dc.date.available | 2019-11-21T06:22:14Z | |
dc.date.issued | 2014 | |
dc.identifier.uri | http://gnosis.library.ucy.ac.cy/handle/7/56008 | |
dc.description.abstract | Platinum nanoparticles supported on single CeO2 and TiO 2 metal oxides and Ce0.8Ti0.2O 2-δ solid solution were prepared to investigate the effect of Ti4+-doping of ceria on important mechanistic and kinetic aspects of the Water-Gas Shift (WGS) reaction in the 200-300 °C range, namely: (i) the concentration and chemical structure of active adsorbed reaction intermediates present in the C-path and H-path of WGS, and (ii) the prevailing mechanistic path among "redox" and "associative" both proposed in the literature. The relationship between the chemical nature of dopant (Zr 4+, Ti4+ and La3+) and the concentration of active C-pool and H-pool of reaction intermediates as well as that of specific rate per gram basis (rCO, μmol g-1 s-1) for the ceria-doped supported Pt is illustrated for the first time based on relevant results previously reported (Zr4+ and La3+-doped ceria). The 0.5 wt% Pt supported on Ce0.8Ti0.2O 2-δ (Ti4+-doped CeO2) exhibits significantly higher WGS activity in terms of CO conversion (%) and specific kinetic rate (μmol CO g-1 s-1 or μmol CO cm -1 s-1) compared to Pt/CeO2, Pt/TiO 2, Pt/Ce0.8La0.2O2-δ and Pt/Ce0.5Zr0.5O2-δ catalysts. This was explained mainly by: (i) the larger concentration of active C-pool of reaction intermediates formed around each Pt nanoparticle, and (ii) the higher reactivity of sites (k, s-1) along the Pt-support interface responsible for CO2 and H2 formation. A very good correlation between the concentration of active C-pool and the specific reaction rate, rCO (μmol g-1 s-1) as a function of the dopant (Zr 4+, La3+ and Ti4+) was found. The concentration of labile surface oxygen and its mobility in Ce0.8Ti 0.2O2-δ compared to CeO2 (undoped), La3+ or Zr4+-doped ceria are also important factors. It is proposed that on Pt/CeO2-doped catalysts the WGS reaction follows both the "redox" and "associative formate" mechanisms, where the extent of participation of each mechanism depends on the chemical nature of the dopant (Zr4+, La3+ and Ti4+). © 2013 Elsevier B.V. All rights reserved. | en |
dc.source | Catalysis Today | en |
dc.source.uri | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84896920519&doi=10.1016%2fj.cattod.2013.10.081&partnerID=40&md5=c909ef3569ab658a42b867d6ebcf0ac3 | |
dc.subject | Carbon dioxide | en |
dc.subject | Platinum | en |
dc.subject | Lakes | en |
dc.subject | Doping (additives) | en |
dc.subject | Nanoparticles | en |
dc.subject | Titanium | en |
dc.subject | Catalysts | en |
dc.subject | Zirconium | en |
dc.subject | Operando | en |
dc.subject | Water gas shift | en |
dc.subject | WGS reactions | en |
dc.subject | Reaction intermediates | en |
dc.subject | SSITKA-DRIFTS | en |
dc.subject | SSITKA-MS | en |
dc.subject | Supported Pt | en |
dc.subject | WGS reaction mechanism | en |
dc.subject | Operando studies | en |
dc.subject | Ceria-doped supported Pt | en |
dc.subject | Transient isotopic techniques | en |
dc.title | The effect of La3+, Ti4+ and Zr4+ dopants on the mechanism of WGS on ceria-doped supported Pt catalysts | en |
dc.type | info:eu-repo/semantics/article | |
dc.identifier.doi | 10.1016/j.cattod.2013.10.081 | |
dc.description.volume | 228 | |
dc.description.startingpage | 183 | |
dc.description.endingpage | 193 | |
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 :16</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 | |