dc.contributor.author | Lambrou, Panayiota S. | en |
dc.contributor.author | Polychronopoulou, Kyriaki | en |
dc.contributor.author | Petallidou, Klito C. | en |
dc.contributor.author | Efstathiou, Angelos M. | en |
dc.creator | Lambrou, Panayiota S. | en |
dc.creator | Polychronopoulou, Kyriaki | en |
dc.creator | Petallidou, Klito C. | en |
dc.creator | Efstathiou, Angelos M. | en |
dc.date.accessioned | 2019-11-21T06:21:03Z | |
dc.date.available | 2019-11-21T06:21:03Z | |
dc.date.issued | 2012 | |
dc.identifier.uri | http://gnosis.library.ucy.ac.cy/handle/7/55762 | |
dc.description.abstract | The present work reports on the effects of oxy-chlorine gas treatment (use of Cl 2/O 2/He gas mixture) applied on a 5wt% Pd/20wt% CeO 2-Al 2O 3 catalyst towards Pd redispersion. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), high resolution transmission electron microscopy (HR-TEM), temperature programmed reduction in H 2 (H 2-TPR) and in situ diffuse reflectance infrared Fourier transformed spectroscopy (DRIFTS) NO chemisorption techniques were employed before and after use of the oxy-chlorine gas treatment to critically evaluate its efficiency. The composition (xvol% Cl 2/18vol% O 2/He), temperature, and time on stream were investigated. The first two parameters were found to largely dictate optimum Pd redispersion, namely the use of a 2vol% Cl 2/18vol% O 2/He gas mixture at 500°C for 1h, where a significant reduction of an initial Pd mean particle size of 17.3-7.5nm was obtained. XPS studies revealed that after oxy-chlorine gas treatment followed by H 2 reduction at 500°C, complete elimination of Cl from the Pd surface was achieved. The oxygen storage capacity (OSC) of the catalyst measured following different oxy-chlorine gas treatments was found to significantly increase. Catalytic activity towards CO oxidation along with in situ DRIFTS NO chemisorption studies proved the large effect of the oxy-chlorine gas treatment on increasing the CO oxidation rate and the extent of NO chemisorption. Alternative treatment in oxygen gas atmosphere at high temperatures (500-850°C) followed by H 2 reduction (300-500°C) applied over the same catalyst failed to cause significant redispersion of Pd as observed with the oxy-chlorine gas treatment. © 2011 Elsevier B.V. | en |
dc.source | Applied Catalysis B: Environmental | en |
dc.source.uri | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84155162547&doi=10.1016%2fj.apcatb.2011.10.018&partnerID=40&md5=0881680a4a2be529649f85ad0ef5f101 | |
dc.subject | Oxygen | en |
dc.subject | X ray diffraction | en |
dc.subject | High temperature | en |
dc.subject | X ray photoelectron spectroscopy | en |
dc.subject | Gases | en |
dc.subject | High resolution transmission electron microscopy | en |
dc.subject | Reduction | en |
dc.subject | Chlorine | en |
dc.subject | Oxidation | en |
dc.subject | Photons | en |
dc.subject | Chemisorption | en |
dc.subject | X-ray photoelectron spectroscopy | en |
dc.subject | In-situ | en |
dc.subject | Chlorination | en |
dc.subject | Oxygen storage capacity | en |
dc.subject | Catalyst activity | en |
dc.subject | Catalytic oxidation | en |
dc.subject | CO oxidation | en |
dc.subject | Atmospheric temperature | en |
dc.subject | Gas mixtures | en |
dc.subject | Mean particle size | en |
dc.subject | Time on streams | en |
dc.subject | Diffuse Reflectance Infrared Fourier Transformed spectroscopies | en |
dc.subject | Gas treatment | en |
dc.subject | Its efficiencies | en |
dc.subject | NO chemisorption | en |
dc.subject | Oxy-chlorination treatment | en |
dc.subject | Oxygen gas | en |
dc.subject | Pd redispersion | en |
dc.subject | Redispersions | en |
dc.subject | Temperature-programmed reduction | en |
dc.subject | Two parameter | en |
dc.title | Oxy-chlorination as an effective treatment of aged Pd/CeO 2-Al 2O 3 catalysts for Pd redispersion | en |
dc.type | info:eu-repo/semantics/article | |
dc.identifier.doi | 10.1016/j.apcatb.2011.10.018 | |
dc.description.volume | 111-112 | |
dc.description.startingpage | 349 | |
dc.description.endingpage | 359 | |
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 :5</p> | en |
dc.source.abbreviation | Appl.Catal.B Environ. | en |
dc.contributor.orcid | Efstathiou, Angelos M. [0000-0001-8393-8800] | |
dc.contributor.orcid | Polychronopoulou, Kyriaki [0000-0002-0723-9941] | |
dc.gnosis.orcid | 0000-0001-8393-8800 | |
dc.gnosis.orcid | 0000-0002-0723-9941 | |