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Solvothermal syntheses of semiconductor photocatalysts of ultra-high activities

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Title: Solvothermal syntheses of semiconductor photocatalysts of ultra-high activities
Authors: Kominami, Hiroshi Browse this author
Kato, Jun-ichi Browse this author
Murakami, Shin-ya Browse this author
Ishii, Yoshinori Browse this author
Kohno, Masaaki Browse this author
Yabutani, Kei-ichi Browse this author
Yamamoto, Takuhei Browse this author
Kera, Yoshiya Browse this author
Inoue, Masashi Browse this author
Inui, Tomoyuki Browse this author
Ohtani, Bunsho Browse this author →KAKEN DB
Keywords: Photocatalyst
Titanium(IV) oxide
Tungsten(VI) oxide
Solvothermal synthesis
Issue Date: 15-Sep-2003
Publisher: Elsevier B.V.
Journal Title: Catalysis Today
Volume: 84
Issue: 3-4
Start Page: 181
End Page: 189
Publisher DOI: 10.1016/S0920-5861(03)00272-4
Description: Thermal treatment of titanium(IV) butoxide dissolved in 2-butanol at 573 K under autogenous pressure (alcohothermal treatment) yielded microcrystalline anatase-type titanium(IV) oxide (TiO2). Thermal treatment of oxobis(2,4-pentanedionato-O,O′)titanium (TiO(acac)2) in ethylene glycol (EG) in the presence of sodium acetate and a small amount of water at 573 K yielded microcrystalline brookite-type TiO2. Tungsten(VI) oxide (WO3) powders of monoclinic crystal structure with high crystallinity were synthesized by hydrothermal treatment (HTT), at 523 or 573 K, of aqueous tungstic acid (H2WO4) solutions prepared from sodium tungstate by ion-exchange (IE) with a proton-type resin. Anatase and brookite TiO2 products were calcined at various temperatures and then used for photocatalytic mineralization of acetic acid in aqueous solutions under aerated conditions and dehydrogenation of 2-propanol under deaerated conditions. Almost all the anatase-type TiO2 samples showed the activities more than twice higher than those of representative active photocatalysts, Degussa P-25 and Ishihara ST-01 in both reactions. A brookite sample with improved crystallinity and sufficient surface area obtained by calcination at 973 K exhibited the hydrogen evolution rate almost equal to P-25. HTT WO3 powders with various physical properties were used as photocatalyst for evolution of oxygen (O2) from an aqueous silver sulfate solution. WO3 powder of high crystallinity, e.g., IE-HTT-WO3 synthesized at 573 K, gave much higher O2 yield than commercially available WO3 samples.
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Type: article (author version)
Appears in Collections:触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大谷 文章

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