Preparation of molybdenum carbide-based catalysts for deep HDN

Molybdenum carbides, bimetallic carbides and supported molybdenum carbides were prepared using the temperature programmed reaction (TPRe) method with different hydrocarbon sources, and their catalytic activities were tested u sing pyridine HDN as a model reaction. The carbon source used for the carbi de synthesis has a large effect on the dispersion, activity and lifetime of the carbide catalysts, while the activity of supported molybdenum carbides is lower than the bulk materials. The addition of a second metal, such as Ni or Co, also has a significant effect on the structural and catalytic pro perties of the final molybdenum carbides; cobalt doped molybdenum carbide h as the longest lifetime and highest activity. (C) 2000 Academie des science s / Editions scientifiques et medicales Elsevier SAS.