Improvement of Catalyst Durability by Deposition of Rh on TiO2 in Photooxidation of Aromatic Compounds

Hisahiro Einaga, Takashi Ibusuki, Shigeru Futamura

研究成果: Contribution to journalArticle査読

82 被引用数 (Scopus)

抄録

Gas-solid heterogeneous photocatalytic oxidation of aromatic compounds in air was carried out at room temperature with a fixed bed flow reactor. The deposition of Rh on TiO2 catalyst improved the catalyst durability in benzene photooxidation. The Rh deposition reduced the amounts of carbonaceous materials on the catalyst surface that were the cause of catalyst deactivation. The highest reaction rate was obtained at the Rh loading of 0.5-1.0 wt %. The Rh/TiO2 catalyst was gradually deactivated in prolonged benzene photooxidation, due to the increasing amount of carbonaceous materials on the catalyst surface. XPS studies showed that the gradual deactivation was related to the changes in the oxidation state of the surface Rh metals. The catalysts were regenerated by the treatment of hydrogen reduction after the photoirradiation in humidified air, indicating that Rh 0 was essential for the improvement of the catalyst durability. The catalyst was also regenerated by the heat treatment in N2 flow instead of the hydrogen reduction. Rh deposition was also effective for the improvement of catalyst durability in toluene photooxidation.

本文言語英語
ページ(範囲)285-289
ページ数5
ジャーナルEnvironmental Science and Technology
38
1
DOI
出版ステータス出版済み - 1 1 2004
外部発表はい

All Science Journal Classification (ASJC) codes

  • 環境工学
  • 環境科学(全般)
  • 環境化学

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