Subcarbonyl species of molybdenum hexacarbonyl supported on silica: A DRIFT study

Journal Article · Thu Oct 06 00:00:00 EDT 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100091a045· OSTI ID:6842316

Kurhinen, M; Venaelaeinen, T; Pakkanen, T A ^[1]

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1. Univ. of Joensuu (Finland)

Subspecies of partially decarbonylated molybdenum hexacarbonyl supported on silica were studied by diffuse reflectance IR spectroscopy. Mo(CO)[sub 6]/SiO[sub 2] was prepared in a fluidized bed reactor by vapor-phase adsorption of molybdenum hexacarbonyl under nitrogen flow. Decarbonylation begins when Mo(CO)[sub 6] has adsorbed onto the silica. Dehydroxylation of the support during calcination facilitates the formation of subspecies of Mo(CO)[sub 6]. The activation energy needed for bond formation between a transition metal and silica and for decarbonylation is lower than the desorption energy of physisorbed Mo(CO)[sub 6], and this was seen in the IR spectra as a disappearance of bands due to subspecies. When the supported Mo(CO)[sub 6] was reheated the physisorption bands were the last to disappear from the IR spectra. 37 refs., 6 figs., 2 tabs.

• OSTI ID: 6842316
• Journal Information: Journal of Physical Chemistry; (United States), Vol. 98:40; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

10 SYNTHETIC FUELS
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
MOLYBDENUM COMPLEXES
INFRARED SPECTRA
SILICA
ACTIVATION ENERGY
ADSORPTION
CARBON DIOXIDE
CATALYST SUPPORTS
COMPILED DATA
FISCHER-TROPSCH SYNTHESIS
METHANATION
NITROGEN
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COMPLEXES
DATA
ELEMENTS
ENERGY
INFORMATION
MINERALS
NONMETALS
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SPECTRA
TRANSITION ELEMENT COMPLEXES
100200* - Synthetic Fuels- Production- (1990-)
400102 - Chemical & Spectral Procedures
400201 - Chemical & Physicochemical Properties