379909 Synthesis of Molybdenum Oxide Particles By Ultrasonic Spray Pyrolysis and Their Partial Oxidation Activity

Monday, November 17, 2014
Galleria Exhibit Hall (Hilton Atlanta)
Hanseul Choi1, Jinsoo Kim1 and Su Ha2, (1)Department of Chemical Engineering, Kyung Hee University, Yongin, South Korea, (2)The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA

Molybdenum oxides exist mainly in two forms: MoO2 and MoO3. MoO3 has been used as a semiconductor, a field-emitter, an electrochromic material, photochromic material, and a gas sensor. MoO2 exhibits metal-like electronic conductivity because of the existence of delocalized electrons in its valence band. Both MoO3 and MoO2 have been used as a catalyst in hydrocarbon reforming processes. In particular, MoO2 has attracted a lot of attention due to coke resistance and sulphur tolerance during the partial oxidation of hydrocarbons. Although commercial MoO2 has a very small BET surface area (< 10 m2/g), some researchers reported solvothermal synthesis of MoO2 nanoparticles with a high BET surface area of about 50 m2/g. However, the yield of MoO2 nanoparticles by solvothermal synthesis was less than 1 g/batch. In this study, we developed a large scale production process for molybdenum oxides by ultrasonic spray pyrolysis. The particle size and phase structure of the product molybdenum oxides were affected by precursor concentration, pyrolysis temperature, carrier gas flow rate, etc. As-synthesized MoO2 particles were analyzed by BET, XRD, EDX, TGA, and FT-IR. Partial oxidation reaction was studied to test the catalytic performance of the as-synthesized MoO2 using n-dodecane as a fuel which is a model compound of bio-diesel. The effect of O2/C ratio, reaction temperature, and weight-hourly space velocity (WHSV) on the conversion and H2 production were systematically investigated. H2 and CO yields, and carbon conversion over as-synthesized MoO2 were calculated and compared with those over commercial one. The as-synthesized MoO2 particles showed promising reforming performance without any coke formation.

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