Preparation, Interconversion and Characterization of Nanometer-sized Molybdenum Carbide Catalysts

Journal Article · Sun Jan 01 04:00:00 EST 2006 · Topics in Catalysis

DOI:https://doi.org/10.1007/s11244-006-0064-z· OSTI ID:930241

Kugler, E; Clark, C; Wright, J; Dadyburjor, D; Hanson, J; Song, Z; Cai, T; Hrbek, J

Nanometer-sized molybdenum carbide particles have been shown to have hydrogenation and other catalytic properties similar to those of the more-expensive noble metals. However, current preparation techniques for molybdenum carbide require the high-temperature reduction of unsupported molybdenum oxide in the presence of CH{sub 4} and H{sub 2}. Although this method is effective, it yields particles of relatively large size, 11 nm. Different, simpler, synthesis procedures starting with ammonium heptamolybdate impregnated on carbon yield carbides of different stoichiometries. Particle sizes are in the 2--10 nm range, which are generally smaller than those previously obtained, and can be altered by changing the method of preparation. The focus of this work is to characterize the new procedures, specifically the bulk transitions of the new starting material to the different molybdenum carbides, using time-resolved X-ray diffraction, temperature-programmed reduction, and temperature-programmed desorption.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 930241
• Report Number(s): BNL--80923-2008-JA
• Journal Information: Topics in Catalysis, Journal Name: Topics in Catalysis Vol. 39
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CATALYSTS
CHEMICAL PREPARATION
MOLYBDENUM CARBIDES
NANOSTRUCTURES
PRECURSOR
national synchrotron light source