Real-time investigation on photocatalytic oxidation of gaseous methanol with nanocrystalline WO 3-TiO 2 composite films

Shivaji B. Sadale; Kei Noda; Kei Kobayashi; Hirofumi Yamada; Kazumi Matsushige

doi:10.1016/j.tsf.2011.10.054

Real-time investigation on photocatalytic oxidation of gaseous methanol with nanocrystalline WO ₃-TiO ₂ composite films

Shivaji B. Sadale, Kei Noda, Kei Kobayashi, Hirofumi Yamada, Kazumi Matsushige

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

Here we report on our investigation on photocatalytic oxidation (PCO) of gaseous methanol with WO ₃-TiO ₂ composite films. WO ₃ and WO ₃-TiO ₂ composite thin films were prepared by drop casting method. PCO of gaseous methanol and hydrogen generation process on platinum loaded WO ₃-TiO ₂ composite thin films in high vacuum were investigated using a home-made reactor with a six-channel quadrupole mass spectrometer at real-time scale under UVA (300-400 nm) light illumination. In the case of Pt loaded WO ₃ thin films, PCO of gaseous methanol proceeds through intermediates viz. formaldehyde, CO and finally to CO ₂ and H ₂. PCO of gaseous methanol occurs via direct hole transfer over Pt loaded WO ₃ thin films. On the other hand, PCO of gaseous methanol over Pt loaded WO ₃-TiO ₂ composite thin films proceeds with competitive direct and indirect hole transfer reactions. Our real-time analysis of gas phase photocatalysis realized the identification of direct and indirect hole transfer processes and the reaction intermediates thereof.

Original language	English
Pages (from-to)	3847-3851
Number of pages	5
Journal	Thin Solid Films
Volume	520
Issue number	10
DOIs	https://doi.org/10.1016/j.tsf.2011.10.054
Publication status	Published - 2012 Mar 1
Externally published	Yes

Keywords

Direct/indirect hole transfer
Gas phase photocatalysis
Methanol decomposition
Titanium dioxide
Tungsten trioxide

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Surfaces and Interfaces
Surfaces, Coatings and Films
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/j.tsf.2011.10.054

Cite this

@article{104d43ca2bab45a5b0e25684fe5d87a8,

title = "Real-time investigation on photocatalytic oxidation of gaseous methanol with nanocrystalline WO 3-TiO 2 composite films",

abstract = "Here we report on our investigation on photocatalytic oxidation (PCO) of gaseous methanol with WO 3-TiO 2 composite films. WO 3 and WO 3-TiO 2 composite thin films were prepared by drop casting method. PCO of gaseous methanol and hydrogen generation process on platinum loaded WO 3-TiO 2 composite thin films in high vacuum were investigated using a home-made reactor with a six-channel quadrupole mass spectrometer at real-time scale under UVA (300-400 nm) light illumination. In the case of Pt loaded WO 3 thin films, PCO of gaseous methanol proceeds through intermediates viz. formaldehyde, CO and finally to CO 2 and H 2. PCO of gaseous methanol occurs via direct hole transfer over Pt loaded WO 3 thin films. On the other hand, PCO of gaseous methanol over Pt loaded WO 3-TiO 2 composite thin films proceeds with competitive direct and indirect hole transfer reactions. Our real-time analysis of gas phase photocatalysis realized the identification of direct and indirect hole transfer processes and the reaction intermediates thereof.",

keywords = "Direct/indirect hole transfer, Gas phase photocatalysis, Methanol decomposition, Titanium dioxide, Tungsten trioxide",

author = "Sadale, {Shivaji B.} and Kei Noda and Kei Kobayashi and Hirofumi Yamada and Kazumi Matsushige",

note = "Funding Information: One of the authors SBS is very much thankful to Japan society for promotion of science for the award of JSPS postdoctoral fellowship for the period 2009–2011. KN gratefully acknowledges the research grant from Kato Foundation for Promotion of Science . Authors are thankful to Prof. S. Isoda, Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University for TEM measurements on our samples. Authors also appreciate kind support from Dr. M. Adachi, (Fuji Chemicals, Co. Ltd.) for TiO 2 gel preparation.",

year = "2012",

month = mar,

day = "1",

doi = "10.1016/j.tsf.2011.10.054",

language = "English",

volume = "520",

pages = "3847--3851",

journal = "Thin Solid Films",

issn = "0040-6090",

publisher = "Elsevier",

number = "10",

}

TY - JOUR

T1 - Real-time investigation on photocatalytic oxidation of gaseous methanol with nanocrystalline WO 3-TiO 2 composite films

AU - Sadale, Shivaji B.

AU - Noda, Kei

AU - Kobayashi, Kei

AU - Yamada, Hirofumi

AU - Matsushige, Kazumi

N1 - Funding Information: One of the authors SBS is very much thankful to Japan society for promotion of science for the award of JSPS postdoctoral fellowship for the period 2009–2011. KN gratefully acknowledges the research grant from Kato Foundation for Promotion of Science . Authors are thankful to Prof. S. Isoda, Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University for TEM measurements on our samples. Authors also appreciate kind support from Dr. M. Adachi, (Fuji Chemicals, Co. Ltd.) for TiO 2 gel preparation.

PY - 2012/3/1

Y1 - 2012/3/1

N2 - Here we report on our investigation on photocatalytic oxidation (PCO) of gaseous methanol with WO 3-TiO 2 composite films. WO 3 and WO 3-TiO 2 composite thin films were prepared by drop casting method. PCO of gaseous methanol and hydrogen generation process on platinum loaded WO 3-TiO 2 composite thin films in high vacuum were investigated using a home-made reactor with a six-channel quadrupole mass spectrometer at real-time scale under UVA (300-400 nm) light illumination. In the case of Pt loaded WO 3 thin films, PCO of gaseous methanol proceeds through intermediates viz. formaldehyde, CO and finally to CO 2 and H 2. PCO of gaseous methanol occurs via direct hole transfer over Pt loaded WO 3 thin films. On the other hand, PCO of gaseous methanol over Pt loaded WO 3-TiO 2 composite thin films proceeds with competitive direct and indirect hole transfer reactions. Our real-time analysis of gas phase photocatalysis realized the identification of direct and indirect hole transfer processes and the reaction intermediates thereof.

AB - Here we report on our investigation on photocatalytic oxidation (PCO) of gaseous methanol with WO 3-TiO 2 composite films. WO 3 and WO 3-TiO 2 composite thin films were prepared by drop casting method. PCO of gaseous methanol and hydrogen generation process on platinum loaded WO 3-TiO 2 composite thin films in high vacuum were investigated using a home-made reactor with a six-channel quadrupole mass spectrometer at real-time scale under UVA (300-400 nm) light illumination. In the case of Pt loaded WO 3 thin films, PCO of gaseous methanol proceeds through intermediates viz. formaldehyde, CO and finally to CO 2 and H 2. PCO of gaseous methanol occurs via direct hole transfer over Pt loaded WO 3 thin films. On the other hand, PCO of gaseous methanol over Pt loaded WO 3-TiO 2 composite thin films proceeds with competitive direct and indirect hole transfer reactions. Our real-time analysis of gas phase photocatalysis realized the identification of direct and indirect hole transfer processes and the reaction intermediates thereof.

KW - Direct/indirect hole transfer

KW - Gas phase photocatalysis

KW - Methanol decomposition

KW - Titanium dioxide

KW - Tungsten trioxide

UR - http://www.scopus.com/inward/record.url?scp=84858334469&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84858334469&partnerID=8YFLogxK

U2 - 10.1016/j.tsf.2011.10.054

DO - 10.1016/j.tsf.2011.10.054

M3 - Article

AN - SCOPUS:84858334469

SN - 0040-6090

VL - 520

SP - 3847

EP - 3851

JO - Thin Solid Films

JF - Thin Solid Films

IS - 10

ER -