On ethane ODH mechanism and nature of active sites over NiO-based catalysts via isotopic labelling and methanol sorption studies
In this paper, the ethane oxidative dehydrogenation (ODH) mechanism is thoroughly investigated via isotopic labeling and methanol sorption studies over NiO and highly selective Ni0.85Nb0.15Ox catalysts. ODH experiments with unlabeled and deuterium labeled ethane demonstrated the existence of strong kinetic isotope effect (KIE) over both NiO and Ni0.85Nb0.15Ox, indicating that Csingle bondH bond scission is the rate determining step in ethane ODH. Similar KIE values obtained for NiO and Ni0.85Nb0.15Ox mixed oxide indicate that both catalysts share similar active sites for ethane activation. Methanol adsorption/desorption followed by TGA, MS, and in situ DRIFTS showed that pure and Nb-doped nickel oxide surfaces primarily host the same redox active sites that differ in terms of abundance (i.e. surface concentration) and activity. O2-TPD studies of used catalysts verified the participation of non-stoichiometric oxygen species in the reaction, which proceeds via a redox mechanism. Based on the above, a detailed reaction mechanism is proposed.
Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης, Πολυτεχνική Σχολή, Τμήμα Χημικών Μηχανικών
J. Catalysis, vol.322  p.118–129
This record is part of 'IKEE', the Institutional Repository of Aristotle University of Thessaloniki's Library and Information Centre found at http://ikee.lib.auth.gr. Unless otherwise stated above, the record metadata were created by and belong to Aristotle University of Thessaloniki Library, Greece and are made available to the public under Creative Commons Attribution-ShareAlike 4.0 International license (http://creativecommons.org/licenses/by-sa/4.0).
Unless otherwise stated in the record, the content and copyright of files and fulltext documents belong to their respective authors. Out-of-copyright content that was digitized, converted, processed, modified, etc by AUTh Library, is made available to the public under Creative Commons Attribution-ShareAlike 4.0 International license (http://creativecommons.org/licenses/by-sa/4.0). You are kindly requested to make a reference to AUTh Library and the URL of the record containing the resource whenever you make use of this material.
*Institutions are responsible for keeping their URLs functional (digital file, item page in repository site)