Hydrotreating nitrides

Molybdenum compounds Hydrodesulphurization and hydrotreating of petroleum Oxidation of methanol to formaldehdye Epoxidation of olefins Decomposition of alkali metal nitrides Irritation of eyes and respiratory tract Pneumoconiosis... 

Hydrotreating and Hydrogenation. - Nitride and oxynitride catalysts have been extensively investigated as catalysts for hydrotreating (in particular hydronitrogenation and hydrodesulfurisation) and hydrogenation (for CO, aromatics, crotonaldehyde and alkenes ° the reduction of NO with H2 has been covered in the previous section). 

Section III is a discussion of HDN by catalysts different from metal sulfides, such as metals, metal carbides, and metal nitrides. The latter two classes of compounds have drawn much attention in the preceding decade in several fields of catalysis. Their possible role in hydrotreating is analyzed critically. 

Interest in the use of metal carbides and nitrides in hydrotreating was aroused by a publication by Schlatter et al. (182) in 1988. They reported that M02C and M02N (unsupported as well as supported on AI2O3) were highly active for HDN of quinoline in autoclaves under industrially realistic... 

Photoluminescence techniques will be applied to a broader range of systems, particularly oxide-supported sulfides (because of their important role in hydrotreating catalysis) as well as unsupported or oxide-supported (oxi)carbides or (oxi)nitrides (because of their growing importance as substitutes for noble metals and because they have metallic and acidic functions). Moreover, improved procedures for preparing catalytic materials will enable the design of tailored oxides with better defined characteristics, such as size, composition, and structure. The accumulation of data concerning the behavior of surface anions will also lead to a more refined view of the coordination chemistry of anions of nontransition elements. 

Sajkowski DJ, Oyama ST (1996) Catalytic hydrotreating by molybdenum carbide and nitride Unsupported Mo N and Mo C/Al O Appl. Catal A 134 339... 

Because of their high activities, carbides and nitrides of molybdenum have drawn most attention as hydrotreating catalysts. Many attempts were made to compare them with commercial sulfide catalysts. In terms of activity per active site, supported and unsupported M02C and M02N were found to be more active than sulfided Ni—M0/AI2O3 or Co—M0/AI2O3 catalysts in many HDS and HDN... 

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