dc.contributor.author | Constantinou, D. A. | en |
dc.contributor.author | álvarez-Galván, M. C. | en |
dc.contributor.author | Fierro, José Luis García | en |
dc.contributor.author | Efstathiou, Angelos M. | en |
dc.creator | Constantinou, D. A. | en |
dc.creator | álvarez-Galván, M. C. | en |
dc.creator | Fierro, José Luis García | en |
dc.creator | Efstathiou, Angelos M. | en |
dc.date.accessioned | 2019-11-21T06:18:13Z | |
dc.date.available | 2019-11-21T06:18:13Z | |
dc.date.issued | 2012 | |
dc.identifier.uri | http://gnosis.library.ucy.ac.cy/handle/7/55372 | |
dc.description.abstract | The steam reforming of phenol in the low-temperature range of 350-550°C was studied over 0.5wt% Rh supported on Ce 0.15Zr 0.85O 2, Zr 0.93La 0.07O 2, and Ce 0.13Zr 0.83La 0.04O 2 mixed metal oxides. The reforming specific activity (per gram of catalyst basis) was found to depend on (a) Rh dispersion, (b) the concentration (μmolg -1) of labile oxygen species of support, as determined by " oxygen storage capacity" measurements, and (c) the promotion of the water-gas shift (WGS) reaction rate, all of which largely influenced by the support chemical composition. The addition of 4atom% La 3+ into the Ce 0.15Zr 0.85O 2 crystal structure was found to largely promote the dispersion of Rh, to increase significantly (by a factor of 1.75) the concentration of surface basic sites (μmolm -2) of Ce 0.13Zr 0.83La 0.04O 2 compared to Ce 0.15Zr 0.85O 2 support, to prevent to a large extent the inhibiting role of hydrogen in the rate of WGS reaction, and to influence significantly the concentration and structure of surface reaction intermediates of the WGS, namely: formate (HCOO-) and -OH groups formed on the support, and adsorbed CO formed on the Rh metal. The 0.5wt% Rh/Ce 0.13Zr 0.83La 0.04O 2 catalyst led to a significantly better performance towards steam reforming of phenol in terms of phenol conversion, H 2-yield, and CO/CO 2 product ratio in the 350-450°C range compared to a commercial Ni-based catalyst (44wt% Ni) used for steam reforming reactions. At 400°C, the 0.5wt% Rh/Ce 0.13Zr 0.83La 0.04O 2 catalyst exhibited approximately 54% and 50%, respectively, higher phenol conversion and hydrogen yield, compared to the Ni-based industrial catalyst. The significantly lower CO/CO 2 product ratio obtained in the case of Rh/Ce 0.13Zr 0.83La 0.04O 2 compared to that obtained in the other supported-Rh catalysts is in agreement with the higher kinetic rate for the WGS reaction observed in the former catalyst. © 2012 Elsevier B.V. | en |
dc.source | Applied Catalysis B: Environmental | en |
dc.source.uri | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84858980150&doi=10.1016%2fj.apcatb.2012.01.005&partnerID=40&md5=8ae00106beb72f0471cfe0785c4d6559 | |
dc.subject | Carbon dioxide | en |
dc.subject | Temperature | en |
dc.subject | Dispersions | en |
dc.subject | Hydrogen | en |
dc.subject | Crystal structure | en |
dc.subject | Low temperatures | en |
dc.subject | X ray photoelectron spectroscopy | en |
dc.subject | Lanthanum | en |
dc.subject | XPS | en |
dc.subject | Mass spectrometry | en |
dc.subject | Chemical compositions | en |
dc.subject | Phenols | en |
dc.subject | Catalyst supports | en |
dc.subject | CO-TPD | en |
dc.subject | Surface reactions | en |
dc.subject | Oxygen storage capacity | en |
dc.subject | Zirconium | en |
dc.subject | Cerium | en |
dc.subject | Rhodium | en |
dc.subject | Oxygen species | en |
dc.subject | Reaction rates | en |
dc.subject | Adsorbed CO | en |
dc.subject | Basic sites | en |
dc.subject | CO 2-DRIFTS | en |
dc.subject | CO 2-TPD | en |
dc.subject | H 2O-DRIFTS | en |
dc.subject | HRTEM | en |
dc.subject | Hydrogen production | en |
dc.subject | Hydrogen yields | en |
dc.subject | Industrial catalyst | en |
dc.subject | Kinetic rates | en |
dc.subject | Mixed metal oxide | en |
dc.subject | Ni-based catalyst | en |
dc.subject | OH group | en |
dc.subject | Operando | en |
dc.subject | Operando DRIFTS-mass spectrometry WGS | en |
dc.subject | Phenol conversion | en |
dc.subject | Phenol steam reforming | en |
dc.subject | Product ratios | en |
dc.subject | Rh catalysts | en |
dc.subject | Specific activity | en |
dc.subject | Steam reforming | en |
dc.subject | Supported-Rh catalysts | en |
dc.subject | Water gas shift | en |
dc.subject | Water-gas-shift reactions | en |
dc.subject | WGS reactions | en |
dc.title | Low-temperature conversion of phenol into CO, CO 2 and H 2 by steam reforming over La-containing supported Rh catalysts | en |
dc.type | info:eu-repo/semantics/article | |
dc.identifier.doi | 10.1016/j.apcatb.2012.01.005 | |
dc.description.volume | 117-118 | |
dc.description.startingpage | 81 | |
dc.description.endingpage | 95 | |
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 :21</p> | en |
dc.source.abbreviation | Appl.Catal.B Environ. | en |
dc.contributor.orcid | Efstathiou, Angelos M. [0000-0001-8393-8800] | |
dc.gnosis.orcid | 0000-0001-8393-8800 | |