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Solvothermal syntheses of semiconductor photocatalysts of ultra-high activities
| 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 | | Brookite | | 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. |
| Description URI: | http://www.elsevier.com/wps/find/journaldescription.cws_home/500857/description |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/17127 |
| 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)
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Submitter: 大谷 文章
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