Carbon-covered alumina as a support for sulfide catalysts

Journal Article · Thu Dec 01 04:00:00 EST 1988 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(88)90033-4· OSTI ID:6843745

Vissers, J P.R.; Mercx, F P.M.; Bouwens, S M.A.M.; De Beer, V H.J.; Prins, R ^[1]

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1. Eindhoven Univ. of Technology (Netherlands)

Carbon-covered alumina carrier materials (10-35 wt.% carbon deposited) were prepared via pyrolysis (873-973 K) of cyclohexene or ethene on the surface of a {gamma}-alumina and evaluated for their use as supports for cobalt sulfide hydrodesulfurization catalysts. Promising textural properties were obtained for the samples prepared: BET surface areas up to 334 m{sup 2}/g, meso- and macropore surface areas reaching values of 190-270 m{sup 2}/g, and narrow pore size distributions in the 2.5-10 nm pore radius range. XPS measurements showed that the alumina surface was not uniformly covered, probably due to diffusion limitations of the carbon forming hydrocarbons. The coverage could be improved (maximum value reached was 77%) by increasing the amount of carbon deposited as well as by an additional high-temperature (1073 K) treatment. The thiophene hydrodesulfurization activity of Co sulfide supported on the prepared carbon-covered aluminas was found to increase linearly with increasing alumina surface coverage by carbon. A threefold increase in activity compared to Co/Al{sub 2}/O{sub 3} catalysts was obtained, demonstrating the effective shielding by the carbon layer which reduces or eliminates the strong metal-alumina interactions. Oxidizing the carbon surface prior to the introduction of cobalt led to a further improvement of the catalytic activity.

• OSTI ID: 6843745
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 114:2; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402 -- Coal
Lignite
& Peat-- Purification & Upgrading
02 PETROLEUM
020400* -- Petroleum-- Processing
ALKENES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COBALT COMPOUNDS
COBALT SULFIDES
CRYSTAL STRUCTURE
CYCLOALKENES
DECOMPOSITION
DENITRIFICATION
DEPOSITS
DESULFURIZATION
ELECTRON SPECTROSCOPY
ELEMENTS
ETHYLENE
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROGENATION
MICROSTRUCTURE
MOLYBDENUM COMPOUNDS
MOLYBDENUM SULFIDES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PHOTOELECTRON SPECTROSCOPY
POROSITY
PYROLYSIS
REFRACTORY METAL COMPOUNDS
SPECTROSCOPY
SULFIDES
SULFUR COMPOUNDS
SURFACE AREA
SURFACE PROPERTIES
SYNTHESIS
TESTING
TEXTURE
THERMOCHEMICAL PROCESSES
THIOPHENE
TRANSITION ELEMENT COMPOUNDS
X-RAY SPECTROSCOPY