Co-Ti-O complex oxides: Hydrothermal synthesis, phase characterization, color analysis and catalytic Activity assessment

Apinpus Rujiwatra, Natthawat Semakul, Sireenart Surinwong, Metta Chareonpanich
* Author for corresponding; e-mail address: apinpus@chiangmai.ac.th, apinpus@gmail.com
Volume: Vol.42 No.4 (OCTOBER 2015)
Research Article
DOI:
Received: 17 April 2014, Revised: -, Accepted: 25 June 2014, Published: -

Citation: Rujiwatra A., Semakul N., Surinwong S. and Chareonpanich M., Co-Ti-O complex oxides: Hydrothermal synthesis, phase characterization, color analysis and catalytic Activity assessment, Chiang Mai Journal of Science, 2015; 42(4): 857-867.

Abstract

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.

Keywords: Cobalt titanate, Hydrothermal synthesis, Color, Catalyst, Fischer-Tropsch synthesis

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