Mechanism of hydrodesulfurization of dibenzothiophene on Co-Mo/Al[sub 2]O[sub 3] and Co/Al[sub 2]O[sub 3] catalyst by the use of radioisotope [sup 35]S tracer

Journal Article · Wed Sep 01 00:00:00 EDT 1993 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1993.1269· OSTI ID:5548201

Kabe, T; Qian, W; Ogawa, S; Ishihara, A ^[1]

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1. Tokyo Univ. of Agriculture and Technology (Japan)

In order to estimate the behavior of sulfur on hydrodesulfurization catalyst, the [sup 35]S-labelled dibenzothiophene ([sup 35]S-DBT) was hydrodesulfurized on sulfided Co-Mo/Al[sub 2]O[sub 3] and Co/Al[sub 2]O[sub 3] in a fixed-bed pressurized flow reactor. During the reaction, the radioactivities of unreacted [sup 35]S-DBT and formed [sup 35]S-H[sub 2]S were monitored. The rate of the release of sulfur on the catalyst was estimated from the rates of an increase and a decrease of the radioactivity in formed [sup 35]S-H[sub 2]S. The activation energies of the release of sulfur were 3.7 and 9.9 kcal/mol for sulfided Co-Mo/Al[sub 2]O[sub 3] and Co/Al[sub 2]O[sub 3], respectively. The amount of labile sulfur (S[sub 0]), which could be calculated from the maximum amount of [sup 35]S accomodated on the catalyst, increased with increasing temperature. When it was assumed that sulfur in sulfided Co-Mo/Al[sub 2]O[sub 3] existed in the form of Co[sub 9]S[sub 8]-MoS[sub 2]/Al[sub 2]O[sub 3], the ratio of labile sulfur to total sulfur did not exceed 50%, even under conditions where the rate of DBT HDS is relatively high. On the contrary, the ratio of labile sulfur to total sulfur for Co/Al[sub 2]O[sub 3] exceeded 80%. 34 refs., 7 figs., 2 tabs.

• OSTI ID: 5548201
• Journal Information: Journal of Catalysis; (United States), Vol. 143:1; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
02 PETROLEUM
01 COAL, LIGNITE, AND PEAT
ALUMINIUM OXIDES
CATALYTIC EFFECTS
COBALT
MOLYBDENUM
POLYCYCLIC SULFUR HETEROCYCLES
DESULFURIZATION
ACTIVATION ENERGY
CATALYST SUPPORTS
CATALYSTS
HETEROGENEOUS CATALYSIS
HYDROGENATION
SULFUR 35
ALUMINIUM COMPOUNDS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CATALYSIS
CHALCOGENIDES
CHEMICAL REACTIONS
DAYS LIVING RADIOISOTOPES
ELEMENTS
ENERGY
EVEN-ODD NUCLEI
HETEROCYCLIC COMPOUNDS
ISOTOPES
LIGHT NUCLEI
METALS
NUCLEI
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RADIOISOTOPES
SULFUR ISOTOPES
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties
020400 - Petroleum- Processing
010402 - Coal
Lignite
& Peat- Purification & Upgrading