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Effect of composition and pretreatment on the activity of nickel/molybdenum-based hydrodesulfurization catalysts

Journal Article · · Ind. Eng. Chem., Prod. Res. Dev.; (United States)
DOI:https://doi.org/10.1021/i360072a020· OSTI ID:6210801
The effect of composition and pretreatment on the activity of nickel/molybdenum-based hydrodesulfurization catalysts was studied by measuring the conversion of thiophene (a model reaction for coal liquid hydrodesulfurization processes) at 300/sup 0/-450/sup 0/C in a flow reactor. A 5% NiO/10% MoO/sub 3//(GAMMA)-Al/sub 2/O/sub 3/ catalyst showed high activity without any pretreatment. Prereduction of the catalysts in hydrogen at 300/sup 0/C increased their activities, which were highest for catalysts containing 3% NiO and 10-15% MoO/sub 3/, but catalyst pretreated in hydrogen at > 350/sup 0/C showed low activities. Catalyst pretreatment in pure hydrogen sulfide further improved the activity, which passed through a maximum for a 3% NiO/35% MoO/sub 3//Al/sub 2/O/sub 3/ catalyst presulfided at 400/sup 0/C. A reaction mechanism is proposed, in which the catalytic activity is related with the positive hole carrier density in the catalyst.
Research Organization:
Imp. Coll. Lond.
OSTI ID:
6210801
Journal Information:
Ind. Eng. Chem., Prod. Res. Dev.; (United States), Journal Name: Ind. Eng. Chem., Prod. Res. Dev.; (United States) Vol. 18:4; ISSN IEPRA
Country of Publication:
United States
Language:
English