Mechanism of hydrodenitrogenation H sub 2 -D sub 2 exchange in reduced molybdenum catalysts

Technical Report · Tue Jan 01 04:00:00 EST 1991

DOI:https://doi.org/10.2172/7275170· OSTI ID:7275170

Miranda, R

Diffuse reflectance infrared spectroscopy was used to study the deuterium exchangeability of reduced molybdena catalysts supported on silica, alumina and 75% silica-alumina. It was found that silica hydroxyls react partially with deposited molybdena. The new species formed does not lead to regeneration of hydroxyl on the catalyst. On the other hand, the interaction of molybdena with alumina or silica-alumina leads to the generation of interfacial OH groups, that compensate for the hydroxyls lost to reaction. In this project is a proposed that the selectivity of the Hydrodenitrogenation (HDN) reaction can be affected by an alteration of the catalyst acidity since it is possible that an acidic Hofmann-like deamination pathway is operative (1) in parallel with the hydrogenolysis of saturated C--N--C bonds. Such was the conclusion from the study done of the denitrogenation of piperidine (3), where it was demonstrated that Bronsted acid sites are active for the denitrogenation of N-heterocycles where as Lewis sites are not.

• Research Organization: Louisville Univ., KY (United States). Dept. of Chemical Engineering
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-89PC89771
• OSTI ID: 7275170
• Report Number(s): DOE/PC/89771-9; ON: DE92018436
• Country of Publication: United States
• Language: English

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ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYTIC EFFECTS
CHALCOGENIDES
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