262592 Reverse Micelle Synthesis and Characterization of Nanoparticle Catalysts for Tri Reforming of CO2

Monday, October 29, 2012: 10:10 AM
321 (Convention Center )
Yishan Zhang, Juan Cruz, Thomas Zacharia and Tracy J. Benson, Dan F. Smith Department of Chemical Engineering, Lamar University, Beaumont, TX

Tri reforming is one of the potential processes to convert CO2 into synthesis gas with desirable CO/H2 ratio by combining steam reforming, CO2 reforming, and CH4 oxidation. Ni supported on different metal oxides such as a-Al2O3, TiO2, MgO, SiO, Cr2O3, CaO, or a combination these are potential catalysts for the tri-reforming process.

Reverse micelles were used to improve the nanoparticle size uniformity of Ni and NiSn combinations supported TiO2 (anatase), which has an abundance of oxygen vacancies within the lattice structure. Two different methods were investigated to optimize the use of reverse micelle: (1) Direct reverse micelle method, where metal cations within the reverse micelle were reduced by NaBH4 reducing agent, which was diffused into the water droplets, and then supported on TiO2 and (2) Two reverse micelle system, where both metal cations and the reducing agent form reverse micelle and then react with each other to produce the nanoparticles.

X-ray Diffraction (XRD) was used to characterize the structural properties of Ni (or NiSn)/TiO2. From XRD, it was estimated that the crystallite size of the supported metal was ~20 nm. Transmission electron microscopy (TEM) was used to confirm the particle size distribution.  Catalyst composition and morphology was determined from SEM-EDX.  Raman and FTIR spectroscopy were utilized to understand the effects of different metal concentrations on the Ti-O band. These findings and possible catalytic reaction mechanisms will be discussed.

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See more of this Session: Catalysis for CO2 Conversion
See more of this Group/Topical: Catalysis and Reaction Engineering Division