Structural evolution of alumina supported Mo-W carbide nanoparticles synthesized by precipitation from homogeneous solution
- Reactor Engineering and Technology Group, School of Chemical Engineering and Industrial Chemistry, University of New South Wales, Anzac Parade, Sydney 2052 (Australia)
The synthesis of alumina-supported Mo-W carbide nanoparticles from the propane carburization of precursor metal sulphide, itself, obtained via precipitation from homogeneous solution (PFHS) has been investigated. Carburization temperature and time as well as the temperature-composition and time-temperature interaction effects were also found to be important determinants of the BET surface area, pore volume, surface chemical nature and extent of carburization. Thermogravimetry revealed that the metal sulphide conversion proceeds via a two-stage process involving substitutionary reaction in which S atom is replaced with carbon atom in the metal lattice. SEM images also confirmed that although temperature is detrimental to high surface area, the presence of spherical nanoagglomerates (25-35 nm) is indicative of the high dispersion offered by precipitation from homogeneous solution.
- OSTI ID:
- 20883097
- Journal Information:
- Materials Research Bulletin, Vol. 40, Issue 1; Other Information: DOI: 10.1016/j.materresbull.2004.09.007; PII: S0025-5408(04)00294-6; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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