Synthesis and characterization of molybdenum carbides using propane as carbon source

Journal Article · Wed Feb 15 04:00:00 EST 2006 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2005.11.009· OSTI ID:20784893

Xiaohui, Wang ^[1]; Hongling, Hao ^[1]; Minghui, Zhang ^[1]; Li, Wei ^[1]; Keyi, Tao ^[1]

---

1. Institute of New Catalytic Materials Science, College of Chemistry, Nankai University, Tianjin 300071 (China)

Bulk face-centered-cubic (fcc)-based {eta}-MoC{sub 1-} {sub x} and hexagonal-close-packed (hcp)-based {beta}-Mo{sub 2}C have been prepared using C{sub 3}H{sub 8}/H{sub 2} by temperature-programmed reaction method and a rapid heating method. In this work, direct carburization of MoO{sub 3} produces {eta}-MoC{sub 1-} {sub x} or MoO {sub x} C {sub y} with excess carbon, different from that with CH{sub 4}/H{sub 2} or C{sub 2}H{sub 6}/H{sub 2} as carburization reagent. A successive post-treatment by hydrogen causes the phase transformation from fcc-based {eta}-MoC{sub 1-} {sub x} or MoO {sub x} C {sub y} to hcp-based {beta}-Mo{sub 2}C. Amorphous SiO{sub 2}-supported {beta}-Mo{sub 2}C is also successfully prepared by the two methods and passes through the same route as the bulk one. HRTEM, BET surface area measurements and thiophene hydrodesulfurization reaction are conducted for the comparison of the two methods. The results indicate that different ramping rates bring slight difference in specific surface area and initial catalytic activity but obvious difference in particle size to the final product supported {beta}-Mo{sub 2}C.

• OSTI ID: 20784893
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 179; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBURIZATION
ETHANE
FCC LATTICES
HCP LATTICES
HYDROGEN
METHANE
MOLYBDENUM CARBIDES
MOLYBDENUM OXIDES
PHASE TRANSFORMATIONS
PROPANE
SILICON OXIDES
SYNTHESIS
THIOPHENE
TRANSMISSION ELECTRON MICROSCOPY