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FT-IR study of CO adsorption on sulfided Mo/Al sub 2 O sub 3 unpromoted or promoted by metal carbonyls: Titration of sites

Journal Article · · Journal of Catalysis; (United States)
;

The IR study of CO adsorption at low temperature has been used to follow the transformation of unpromoted Mo sites into promoted ones on sulfided Mo/Al{sub 2}O{sub 3} catalysts. The promotion is realized by thermal decomposition of integrated molar extinction coefficients of the v(CO) bands corresponding to the different sites has been performed. For the unpromoted catalyst, the titration technique used leads to a number of Mo sites, which is in good agreement with that provided from the geometrical model. Evidence that the formation of one promoted site occurs at the expense of one unpromoted site is provided. However, the number of detected promoted sites is lower than that expected from the amount of cobalt introduced: introduction of six cobalt atoms leads to the creation of only one promoted site. The migration of cobalt atoms into intercalated positions or into alumina is considered.

OSTI ID:
7141920
Journal Information:
Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 137:1; ISSN 0021-9517; ISSN JCTLA
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010402 -- Coal
Lignite
& Peat-- Purification & Upgrading
02 PETROLEUM
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CARBONYLS
CATALYST SUPPORTS
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT COMPOUNDS
COMPARATIVE EVALUATIONS
ELECTROMAGNETIC RADIATION
EVALUATION
FOURIER TRANSFORMATION
HYDROGENATION
INFRARED RADIATION
INTEGRAL TRANSFORMATIONS
MOLYBDENUM COMPOUNDS
MOLYBDENUM SULFIDES
OXIDES
OXYGEN COMPOUNDS
PROMOTERS
RADIATIONS
REFRACTORY METAL COMPOUNDS
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SULFIDES
SULFUR COMPOUNDS
SURFACE PROPERTIES
TITRATION
TRANSFORMATIONS
TRANSITION ELEMENT COMPOUNDS