Oxide solid solutions NiO-MgO of high surface area were studied by XPS. The surface Ni(2+) concentration was found to be equal, within experimental errors, to the bulk concentration. The result is analogous to that found previously for the low surface area NiO-MgO system and for both the high and low surface area systems of CoO-MgO. The catalytic oxidation of CO by O(2), on high and low surface area NiO-MgO and CoO-MgO materials, was investigated with the aim of relating the catalytic activity with transition metal ion nature and concentration. Turnover frequency data (CO(2) molecules produced per second per surface atom) show that the activity is due primarily to the transition metal ions and is not subject to the ions being in special configurations (dimers or trimers) or in special positions (edges, corners). The activity of CoO-MgO is higher than that of NiO-MgO solid solution.

High and low surface area NiO-MgO and CoO-MgO solid solutions: a study of XPS surface composition and CO oxidation activity / A., Cimino; Gazzoli, Delia; V., Indovina; Moretti, Giuliano; Occhiuzzi, Manlio; F., Pepe. - In: TOPICS IN CATALYSIS. - ISSN 1022-5528. - 8:3-4(1999), pp. 171-178. [10.1023/a:1019113228026]

High and low surface area NiO-MgO and CoO-MgO solid solutions: a study of XPS surface composition and CO oxidation activity

GAZZOLI, DELIA;MORETTI, GIULIANO;OCCHIUZZI, Manlio;
1999

Abstract

Oxide solid solutions NiO-MgO of high surface area were studied by XPS. The surface Ni(2+) concentration was found to be equal, within experimental errors, to the bulk concentration. The result is analogous to that found previously for the low surface area NiO-MgO system and for both the high and low surface area systems of CoO-MgO. The catalytic oxidation of CO by O(2), on high and low surface area NiO-MgO and CoO-MgO materials, was investigated with the aim of relating the catalytic activity with transition metal ion nature and concentration. Turnover frequency data (CO(2) molecules produced per second per surface atom) show that the activity is due primarily to the transition metal ions and is not subject to the ions being in special configurations (dimers or trimers) or in special positions (edges, corners). The activity of CoO-MgO is higher than that of NiO-MgO solid solution.
catalytic co oxidation; ni and co oxidation catalysts; oxide solid solutions; surface composition; xps quantitative analysis
01 Pubblicazione su rivista::01a Articolo in rivista
High and low surface area NiO-MgO and CoO-MgO solid solutions: a study of XPS surface composition and CO oxidation activity / A., Cimino; Gazzoli, Delia; V., Indovina; Moretti, Giuliano; Occhiuzzi, Manlio; F., Pepe. - In: TOPICS IN CATALYSIS. - ISSN 1022-5528. - 8:3-4(1999), pp. 171-178. [10.1023/a:1019113228026]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/241746
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