Chiang Mai Journal of Science

 The hydrothermal synthesis of Co-Ti-O complex oxide nanoparticles the reaction between TiO₂ and Co(NO₃)₂.6H₂O using the stoichiometric ratio to yield Co₂TiO₄ and NaOH as mineralizer have been investigated. The particles were characterized by powder X-ray diffraction, selected area electron diffraction, scanning electron and transmission electron microscopies, UV-Vis, infrared and Raman spectroscopies, X-ray absorption near-edge spectroscopy, thermogravimetric analysis and gas sorption measurements. Evidences on the pathogenic formation of Co₃O₄ and CoTiO₃ are illustrated, and the unlikely in yielding a single phase of Co₂TiO₄ is revealed. Detailed phase characterization is discussed. The particles showed a dark bluish green color, two different morphologies of rhombus and needle shape with a mean particle size of 150 nm, a remarkably narrow pore size distribution below 75 Å, and type II gas sorption behavior. An excellent performance as a catalyst toward the Fischer-Tropsch synthesis with 35% of CO conversion and a high selectivity toward the C₁₀, has been revealed.