Determination of zero-valent molybdenum after moderate temperature reduction of alumina-supported catalysts

Journal Article · Thu Aug 01 04:00:00 EDT 1991 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(91)90144-S· OSTI ID:5543209

DeCanio, E C; Storm, D A ^[1]

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1. Texaco Inc., Beacon, NY (United States)

Molybdenum is an important component of commercial hydrotreating catalysts. Numerous studies dealing with the oxidation state of the molybdenum species in the reduced sulfided catalysts have been carried out in order to elucidate the sites responsible for catalytic activity. ESCA studies of a moderately reduced (800 K), 8 wt% Mo/Al{sub 2}O{sub 3} catalyst revealed the predominant reduction species to be Mo(4+): no lower oxidation state species were detected. Under more extreme reduction conditions (1,173 K), oxygen chemisorption and benzene hydrogenation studies show that metallic molybdenum species formed. More recently, Mo(0) has been observed by IR from samples prepared by the decomposition of Mo(CO){sub 6} on alumina of various degrees of dehydroxylation. The authors have reported that the use of an infrared technique can be used to observe Mo(0) on moderately reduced conventional alumina-supported molybdenum catalysts. This study illustrates the variables that are important in the formation of Mo(0) on these materials.

• OSTI ID: 5543209
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 130:2; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AROMATICS
BENZENE
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CHEMICAL STATE
CHEMISORPTION
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELEMENTS
FOURIER TRANSFORM SPECTROMETERS
HEAT TREATMENTS
HYDROCARBONS
HYDROGENATION
INFRARED RADIATION
MEASURING INSTRUMENTS
METALS
MOLYBDENUM
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PARAMETRIC ANALYSIS
RADIATIONS
REFRACTORY METAL COMPOUNDS
SEPARATION PROCESSES
SORPTION
SPECTROMETERS
SPECTROSCOPY
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VALENCE