Studies of molybdena-alumina catalysts XVI. Effect of high-temperature sulfiding

Journal Article · Sun Oct 01 04:00:00 EDT 1989 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(89)90183-8· OSTI ID:6845029

Miciukiewicz, J ^[1]; Massoth, F E ^[2]

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1. Adam Mickiewicz Univ., Grunwaldzka (Poland)
2. Univ. of Utah, Salt Lake City (USA)

Candia et. al. recently reported an increase in hydrodesulfurization (HDS) activity of CoMo/Al{sub 2}O{sub 3} catalysts sulfided at 600 C. They attributed the increase in activity to a more active CoMoS phase (Type II) compared to the regular Type I CoMoS phase found in catalysts sulfided at 400 C. Breysse et. al. found a similar effect with NiW/Al{sub 2}O{sub 3} catalysts. Prada Silvy et. al., however, reported no change in HDS activity in sulfiding CoMo/Al{sub 2}O{sub 3} catalysts up to 700 C. In these studies, sintering of the support occurred due to the higher sulfiding temperatures employed compared with the original calcining temperature of the catalyst ({approximately}500 C). The authors decided to determine the effect of sulfiding temperature on the HDS and hydrogenation (HYD) activity of Mo and CoMo catalysts on an alumina support stabilized by calcining at a higher temperature than that used in the sulfiding treatments in order to avoid the complications due to support sintering during sulfiding. The catalysts were sulfided at 400, 550, or 700 C. Sulfided catalysts were characterized by CO{sub 2} and NO chemisorption using a pulse technique. At least duplicate measurements were made on each sample. Catalytic activities for HDS of thiophene and HYD of hexene were carried out at 350 C and under atmospheric pressure in a fixed-bed reactor. Pseudo first-order rate constants were calculated from conversions.

• OSTI ID: 6845029
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 119:2; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

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ALKENES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CALCINATION
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISORPTION
COBALT COMPOUNDS
COBALT SULFIDES
DECOMPOSITION
DESULFURIZATION
FABRICATION
HETEROCYCLIC COMPOUNDS
HEXENES
HYDROCARBONS
HYDROGENATION
IMPREGNATION
KINETICS
MOLYBDENUM COMPOUNDS
MOLYBDENUM SULFIDES
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
SEPARATION PROCESSES
SINTERING
SORPTION
SULFIDATION
SULFIDES
SULFUR COMPOUNDS
SURFACE AREA
SURFACE PROPERTIES
SYNTHESIS
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES
THIOPHENE
TRANSITION ELEMENT COMPOUNDS