Phosphorus poisoning of molybdenum sulfide hydrodesulfurization catalysts supported on carbon and alumina

Journal Article · Mon Aug 01 00:00:00 EDT 1988 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(88)90154-6· OSTI ID:6580959

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

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1. Eindhoven Univ. of Technology (Netherlands)

Phosphorus-containing Mo sulfide catalysts supported on {gamma}-Al{sub 2}O{sub 3} and activated carbon were evaluated for their thiophene HDS activities. Phosphorus was added as phosphoric acid to the carrier material prior to the molydbenum component. The thiophene HDS activity of the carbon-supported catalysts was strongly decreased by phosphorus, while alumina-supported catalysts were not poisoned by phosphorus when present at moderate contents. The structural characteristics and degree of dispersion of the sulfided carbon-supported catalysts were determined by X-ray photoelectron spectroscopy and dynamic CO chemisorption. The cause of the phosphorus poisoning could not be related to a decrease in active phase dispersion or to incomplete sulfidation of the oxidic precursor catalyst. CO chemisorption revealed that in a phosphorus-containing catalyst anion vacancies were blocked. It was suggested that phosphorus poisoning can be related to phosphine (PH{sub 3}), created by reduction of phosphate, probably during the presulfiding treatment. The poisoning effect can be explained as resulting from the adsorption of phosphine on the anion vacancies. The fact that alumina-supported catalysts are not poisoned by phosphorus can be explained by the strong interaction of phosphate with the alumina support. Due to this strong interaction, phosphate will not be reduced to phosphine under the sulfiding and reaction conditions applied.

• OSTI ID: 6580959
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 112:2; 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
ACTIVATED CARBON
ADSORBENTS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CHEMISORPTION
COMPARATIVE EVALUATIONS
DESULFURIZATION
ELECTRON SPECTROSCOPY
ELEMENTS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
INHIBITION
INORGANIC ACIDS
MOLYBDENUM COMPOUNDS
MOLYBDENUM SULFIDES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHINES
PHOSPHORIC ACID
PHOSPHORUS
PHOSPHORUS COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
POISONING
REFRACTORY METAL COMPOUNDS
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
STRUCTURAL CHEMICAL ANALYSIS
SULFIDES
SULFUR COMPOUNDS
SYNTHESIS
THIOPHENE
TRANSITION ELEMENT COMPOUNDS
X-RAY SPECTROSCOPY