Catalysis by transition metal sulfides: theoretical and experimental study of the relation between the synergic systems and the binary transition metal sulfides

Journal Article · Sat Mar 01 00:00:00 EST 1986 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(86)90292-7· OSTI ID:5231204

Harris, S; Chianelli, R R

Both a systematic experimental study of the promoting effect of the first row transition metals on the hydrodesulfurization (HDS) activity of MoS/sub 2/ and a systematic theoretical study of the electronic structure of simple clusters which model these catalyst systems have been carried out. A comparison of measured trends in activity with calculated trends in electronic structure makes it possible to establish an electronic basis for the promotion effects observed in the MoS/sub 2/ systems. Both Co and Ni, which serve as promoters, have the ability to donate electrons to Mo, while Cu, which serves as a poison, withdraws electrons from Mo. The other first row transition metals, which have little effect on the HDS activity of MoS/sub 2/, do not have the ability to donate to or accept electrons from Mo. Thus promotion is associated with an increase in electron density on Mo while poisoning is associated with a decrease in electron density. These results are consistent with previous results which related particular electronic factors to the HDS activity of binary sulfide catalysts.

• Research Organization: Exxon Research and Engineering Co., Annandale, NJ (USA)
• OSTI ID: 5231204
• Journal Information: J. Catal.; (United States), Vol. 98:1
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
MOLYBDENUM SULFIDES
CATALYTIC EFFECTS
PROMOTERS
PERFORMANCE TESTING
CATALYSIS
CATALYSTS
COBALT
COPPER
DESULFURIZATION
ELECTRON DENSITY
ELECTRON TRANSFER
METALS
NICKEL
PETROLEUM FRACTIONS
POISONING
TRANSITION ELEMENTS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
MOLYBDENUM COMPOUNDS
PETROLEUM
REFRACTORY METAL COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
TESTING
TRANSITION ELEMENT COMPOUNDS
020400* - Petroleum- Processing