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Photocatalytic decomposition of NO on titanium oxide thin film photocatalysts prepared by an ionized cluster beam technique (2000)

Takeuchi, Masato ; Yamashita, Hiromi ; Matsuoka, Masaya ; [et al.]

Springer

Catalysis letters 66 (2000), S. 185-187

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ISSN: 1572-879X

Keywords: TiO2 thin film photocatalyst ; ionized cluster beam deposition method ; ion engineering technique ; decomposition reaction of NO

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract Transparent TiO2 thin film photocatalysts were prepared on transparent porous Vycor glass (PVG) by an ionized cluster beam (ICB) method. The UV‐VIS absorption spectra of these films show specific interference fringes, indicating that uniform and transparent TiO2 thin films are formed. The results of XRD measurements indicate that these TiO2 thin films consist of both anatase and rutile structures. UV light (λ 〉 270 nm) irradiation of these TiO2 thin films in the presence of NO led to the photocatalytic decomposition of NO into N2, O2 and N2O. The reactivity of these TiO2 thin films for the photocatalytic decomposition of NO is strongly dependent on the film thickness, i.e., the thinner the TiO2 thin films, the higher the reactivity.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1019095406121

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Photocatalytic decomposition of NO on Ti-HMS mesoporous zeolite catalysts (2000)

Zhang, Jinlong ; Minagawa, Madoka ; Matsuoka, Masaya ; [et al.]

Springer

Catalysis letters 66 (2000), S. 241-243

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ISSN: 1572-879X

Keywords: titanium oxide ; Ti-HMS ; photocatalyst ; decomposition of NO

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract Titanium oxide species were loaded within the framework of mesoporous materials (Ti-HMS) by hydrothermal synthesis. These Ti-HMS exhibited high and unique photocatalytic reactivity for the decomposition of NO into N2 and O2 at 275 K. In situ diffuse reflectance absorption and XRD investigations indicated that the titanium oxide species were dispersed well within the zeolite framework and isolated in tetrahedral coordination with low Ti content.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1019084631137

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Photocatalytic decomposition of NO under visible light irradiation on the Cr‐ion‐implanted TiO2 thin film photocatalyst (2000)

Takeuchi, Masato ; Yamashita, Hiromi ; Matsuoka, Masaya ; [et al.]

Springer

Catalysis letters 67 (2000), S. 135-137

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ISSN: 1572-879X

Keywords: TiO2 thin film photocatalyst ; ionized cluster beam deposition method ; ion implantation ; visible light ; decomposition reaction of NO

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract Transparent TiO2 thin film photocatalysts were prepared on transparent porous Vycor glass (PVG) by the ionized cluster beam (ICB) method. In order to improve the photocatalytic performance of these thin films under visible light irradiation, transition metal ions such as Cr and V were implanted into the deep bulk inside of the films using an advanced metal‐ion‐implantation technique. The UV‐vis absorption spectra of these metal‐ion‐implanted TiO2 thin films were found to shift smoothly toward visible light regions, its extent depending on the amount and kinds of metal ions implanted. Using these metal‐ion‐implanted TiO2 thin films as photocatalysts, the photocatalytic decomposition of NOx into N2 and O2 was successfully carried out under visible light (λ 450 nm) irradiation at 275 K.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1019065521567

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Investigations on the photoluminescence properties of Mo-MCM-41 and the photocatalytic decomposition of NO in the presence of CO (2000)

Tsumura, Rie ; Higashimoto, Shinya ; Matsuoka, Masaya ; [et al.]

Springer

Catalysis letters 68 (2000), S. 101-103

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ISSN: 1572-879X

Keywords: photocatalysis ; photoluminescence ; decomposition of NO ; Mo-MCM-41

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract The photocatalytic decomposition of NO into N2 and CO2 on Mo-MCM-41 was found to proceed efficiently in the presence of CO. In situ photoluminescence measurements demonstrated that this reaction proceeds in a redox cycle between alternating Mo6+ and Mo4+ ions. The yields of N2 formation in the photocatalytic reaction correspond with the yields of the photoluminescence of the tetrahedrally coordinated Mo oxide species, indicating that the charge transfer excited triplet state of the tetrahedral Mo oxide species plays a significant role in this reaction, leading to the formation of N2 and CO2 with a good stoichiometry.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1019035504246

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Photoluminescence properties of tetrahedral titanium oxide species in zeolitic materials (1998)

Ichihashi, Yuichi ; Yamashita, Hiromi ; Anpo, Masakazu ; [et al.]

Springer

Catalysis letters 53 (1998), S. 107-109

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ISSN: 1572-879X

Keywords: photoluminescence ; zeolite ; Ti‐silicalite ; tetrahedral titanium oxide species

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract The photoluminescence spectra of the Y‐type zeolite modified with titanium ions and Ti‐silicalite‐1 have been investigated by varying the excitation energy. A three‐dimensional image of the photoluminescence shows that the peak attributed to tetrahedral titanium oxide species is present at the excitation energy around 200–210 nm, which is consistent with the UV absorption of the samples. The technique enables the distinction of the photoluminescence of the titanium species from that of silicate species.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1019057906526

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