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Author: search.filters.author.Jiamsakul, SiriyaSubject: search.filters.subject.Catalytic activities

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    Item type:Publication,
    Synthesis, preparation and catalytic activities of V-doped TiO2 gel coating on porous α-Al2O3 beads
    (2007-01-01)
    Jaroenworaluck, A.
    ;
    Panyathanmaporn, T.
    ;
    Soontornworajit, B.
    ;
    Supothina, S.
    ;
    Tawkaew, S.
    TiO<inf>2</inf> and V-doped TiO<inf>2</inf> gel were synthesized and coated onto porous α-Al<inf>2</inf>O<inf>3</inf> beads to study the thermal catalytic activities of oxidation reactions. Titanium isopropoxide (Ti(OPr) <inf>4</inf>) and 1,2-butadiol(Bu(OH)<inf>2</inf>) were used as starting chemicals for preparation of TiO<inf>2</inf> gel without V-doping. After aging at ambient temperature for one week, a TiO<inf>2</inf> gel was obtained. The concentration of Ti(OPr)<inf>4</inf> was varied, 0.2, 0.3, 0.7 and 2.4 M was used. For V-doping of the TiO<inf>2</inf> gel, 0.05, 0.20 and 0.75 mole% of V was prepared by ultrasonically dissolving vanadium acetylacetone (V(acac) <inf>2</inf>) in 1,2-butadiol. The solutions were then added to Ti(OPr) <inf>4</inf>. Finally, the mixed solutions were kept under ambient temperature for one week to form the V-doped TiO<inf>2</inf> gel. TiO<inf>2</inf> and V-doped TiO<inf>2</inf> were calcined at 300, 400, 500, 600, 700, and 800°C. XRD analysis, SEM and TEM in conjunction with EDS analysis were used to identify the phases present, grain size and morphology. The TiO<inf>2</inf> grains have a particle size in the nano-scale range. Doping TiO<inf>2</inf> with V could retard growth of the TiO<inf>2</inf> particles and affect phase transformation at higher calcination temperatures. Both the TiO<inf>2</inf> and V-doped TiO<inf>2</inf> gels were prepared and coated onto α-Al <inf>2</inf>O<inf>3</inf> beads to test oxidation reactions in a purpose-designed reactor. The results of the catalytic reactions indicated that V-doped TiO<inf>2</inf> had a higher oxidation activity than the undoped TiO<inf>2</inf> gel. The content of vanadium was related to the reaction efficiency.