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dc.contributor.author
Briand, Laura Estefania
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dc.contributor.author
Hirt, Andrew M.
dc.contributor.author
Wachs, Israel E.
dc.date.available
2018-04-17T18:01:37Z
dc.date.issued
2001-09-23
dc.identifier.citation
Briand, Laura Estefania; Hirt, Andrew M.; Wachs, Israel E.; Quantitative Determination of the Number of Surface Active Sites and the Turnover Frequencies for Methanol Oxidation over Metal Oxide Catalysts: Application to Bulk Metal Molybdates and Pure Metal Oxide Catalysts; Academic Press Inc Elsevier Science; Journal of Catalysis; 202; 2; 23-9-2001; 268-278
dc.identifier.issn
0021-9517
dc.identifier.uri
http://hdl.handle.net/11336/42332
dc.description.abstract
The present work investigates the number and nature of the surface active sites and the catalytic activity of bulk metal molybdates and bulk metal oxides on methanol selective oxidation. Bulk metal molybdates were synthesized by coprecipitation and characterized by laser Raman spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and specific surface area analysis. The number of surface active sites (Ns) was determined by measuring the amount of methoxy species produced by methanol chemisorption on the catalysts at 100°C. The specific activity values (TOFs) were calculated by normalizing the reaction rate by the number of surface active sites. The significant differences in catalytic behavior of bulk metal molybdates and bulk metal oxides, and the surface molybdenum enrichment observed on metal molybdates, gave evidences that the surface of bulk metal molybdates may be composed only by molybdenum oxide species in a two-dimensional overlayer. It was not possible to establish the structure of surface molybdenum oxide species; however, it can be concluded that the structure of surface active sites species of bulk metal molybdates and monolayer supported oxide catalysts are different according to the dispersion of the Ns values of these systems. This work shows, for the first time in the literature, that bulk metal molybdates and monolayer supported molybdenum oxide catalysts possess similar activity and TOF in methanol selective oxidation. The number of active surface sites and the specific activity toward selective oxidation products (TOF redox), CO2 (TOF basic), and dimethyl ether (TOF acid) of bulk metal oxides were also determined. In contrast to bulk metal molybdates, most bulk metal oxides catalyze the total combustion of methanol even at low methanol conversion.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Academic Press Inc Elsevier Science
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
Methanol Chemisorption
dc.subject
Metal Molybdates
dc.subject
Surface Active Sites
dc.subject
Methanol Oxidation
dc.subject
Turnover Frequency
dc.subject
Selective Oxidation
dc.subject
Bulk Catalysts
dc.subject
Supported Catalysts
dc.subject
Metal Oxides
dc.subject.classification
Otras Ingeniería Química
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dc.subject.classification
Ingeniería Química
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dc.subject.classification
INGENIERÍAS Y TECNOLOGÍAS
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dc.title
Quantitative Determination of the Number of Surface Active Sites and the Turnover Frequencies for Methanol Oxidation over Metal Oxide Catalysts: Application to Bulk Metal Molybdates and Pure Metal Oxide Catalysts
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-04-16T13:56:30Z
dc.journal.volume
202
dc.journal.number
2
dc.journal.pagination
268-278
dc.journal.pais
Estados Unidos
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dc.description.fil
Fil: Briand, Laura Estefania. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas ; Argentina
dc.description.fil
Fil: Hirt, Andrew M.. Materials Research Laboratories; Estados Unidos
dc.description.fil
Fil: Wachs, Israel E.. Lehigh University; Estados Unidos
dc.journal.title
Journal of Catalysis
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1006/jcat.2001.3289
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0021951701932890
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