Catalytic functionalities of supported sulfides V. C-N bond hydrogenolysis selectivity as a function of promoter type

Journal Article · Thu Sep 01 00:00:00 EDT 1988 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(88)90249-7· OSTI ID:6571766

Shabtai, J; Balusami, K; Nag, N K; Massoth, F E ^[1]; Guohe, Que ^[2]

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1. Univ. of Utah, Salt Lake City (USA)
2. East China Petroleum Institute, Dongying, Shandong (China)

Two types of {gamma}-Al{sub 2}O{sub 3}-supported catalyst were prepared and their selectivities for C-N bond hydrogenolysis determined. These were (a) sulfided MMo catalysts (where M = Fe, Co, Ni, Ru, Rh, Pd, Ir, Pt, Re, or Cr), containing 25 mmol M and 77 mmol Mo/100 g Al{sub 2}O{sub 3}; and (b) sulfided M catalysts, without Mo, containing 25 mmol M/100 g Al{sub 2}O{sub 3}. Pseudo-first-order rate constants for C-N bond hydrogenolysis of indole (k{sub 1}) and ring hydrogenation of naphthalene (k{sub 2}) were determined (at 350{degree}C and 137 atm H{sub 2} pressure) for the above catalysts as a function of the periodic table position of M. It was found that the C-N hydrogenolysis vs ring hydrogenation selectivity of the MMo catalysts, as expressed by the k{sub 1}/k{sub 2} ratio, was in the order RuMo > IrMo > CrMo > PtMo > CoMo > FeMo > NiMo > ReMo > RhMo > PdMo. RhMo, NiMo, and CoMo show highest C-N hydrogenolysis activity, but relatively low selectivity due to their high ring hydrogenation activity. The sulfided M catalysts, except Pt and Pd, showed markedly lower C-N hydrogenolysis activities than the corresponding MMo catalysts. Comparison of the actual C-N hydrogenolysis activities of MMo catalysts with their additive activities shows that Ni, Rh, Co, Fe, and Ru strongly promote, whereas Pt and Pd strongly depress the C-N hydrogenolysis activity of the corresponding MMo catalysts. Similar promoting (or depressing) effects of the M components are also observed in comparing the actual and additive ring hydrogenation activities of the MMo catalysts. The high C-N hydrogenolysis selectivity of RuMo, IrMo, and PtMo points to the possible use as improved catalysts in HDN of heavy oils, involving lower hydrogen consumption than that found with conventional Ni- and Co-promoted catalysts. 27 refs.

• OSTI ID: 6571766
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 113:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

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02 PETROLEUM
020400* -- Petroleum-- Processing
ALKANES
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AROMATICS
AZAARENES
AZOLES
BIMETALS
CARBON
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL BONDS
CHEMICAL REACTIONS
CHROMIUM
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CHROMIUM SULFIDES
CLEAVAGE
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COBALT SULFIDES
COMPARATIVE EVALUATIONS
CRYSTAL STRUCTURE
CYCLOALKANES
DEHYDROGENATION
DESULFURIZATION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HETEROCYCLIC COMPOUNDS
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HIGH TEMPERATURE
HYDROCARBONS
HYDROGEN
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INDOLES
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IRON SULFIDES
METALS
MICROSTRUCTURE
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ORGANIC COMPOUNDS
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OXIDES
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PALLADIUM
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PALLADIUM SULFIDES
PETROLEUM
PLATINUM
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PLATINUM METALS
PLATINUM SULFIDES
PROMOTERS
PYRROLES
REFRACTORY METAL COMPOUNDS
RHENIUM
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RHODIUM
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