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

Hisahiro Einaga, Takashi Ibusuki, Shigeru Futamura

Research output: Contribution to journalArticle

78 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)285-289
Number of pages5
JournalEnvironmental Science and Technology
Volume38
Issue number1
DOIs
Publication statusPublished - Jan 1 2004
Externally publishedYes

Fingerprint

Photooxidation
Aromatic compounds
photooxidation
durability
Durability
catalyst
Catalysts
Benzene
Hydrogen
benzene
aromatic compound
hydrogen
Oxidation
Catalyst deactivation
oxidation
Toluene
Air
air
Reaction rates
toluene

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Improvement of Catalyst Durability by Deposition of Rh on TiO2 in Photooxidation of Aromatic Compounds. / Einaga, Hisahiro; Ibusuki, Takashi; Futamura, Shigeru.

In: Environmental Science and Technology, Vol. 38, No. 1, 01.01.2004, p. 285-289.

Research output: Contribution to journalArticle

@article{36325ec5c87d41cba634966ae01761fd,
title = "Improvement of Catalyst Durability by Deposition of Rh on TiO2 in Photooxidation of Aromatic Compounds",
abstract = "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.",
author = "Hisahiro Einaga and Takashi Ibusuki and Shigeru Futamura",
year = "2004",
month = "1",
day = "1",
doi = "10.1021/es034336v",
language = "English",
volume = "38",
pages = "285--289",
journal = "Environmental Science & Technology",
issn = "0013-936X",
publisher = "American Chemical Society",
number = "1",

}

TY - JOUR

T1 - Improvement of Catalyst Durability by Deposition of Rh on TiO2 in Photooxidation of Aromatic Compounds

AU - Einaga, Hisahiro

AU - Ibusuki, Takashi

AU - Futamura, Shigeru

PY - 2004/1/1

Y1 - 2004/1/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0347052903&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0347052903&partnerID=8YFLogxK

U2 - 10.1021/es034336v

DO - 10.1021/es034336v

M3 - Article

VL - 38

SP - 285

EP - 289

JO - Environmental Science & Technology

JF - Environmental Science & Technology

SN - 0013-936X

IS - 1

ER -