Effect of calcination atmosphere on TiO2 photocatalysis in hydrogen production from methanol/water solution
Resource
Journal of Photochemistry and Photobiology A: Chemistry 163 (1-2): 277-280
Journal
Journal of Photochemistry and Photobiology A: Chemistry
Journal Issue
163
Pages
277-280
Date Issued
2004
Date
2004
Author(s)
DOI
246246/2006111501233283
Abstract
TiO2 photocatalysts were synthesized by a sol–gel process followed by calcination at 400 ◦C in Ar, air, N2, H2 (3% in N2) and vacuum
(∼5×10−3 torr), respectively. Toward H2 production from a water/methanol (vol. ratio = 1.4/1) solution, the catalysts exhibited activities
in the order, according to calcination atmosphere, of Ar > air > N2 > vacuum ∼ H2. The low activity resulting from either vacuum or
H2 calcination was ascribed to a reduced coverage of surface hydroxyl and high bulk defect density, based on the X-ray photoelectron and
UV-Vis spectroscopic analyses, while the high activity from Ar calcination is to enhanced visible-light excitation.
Subjects
TiO2
Phototcatalysis
Hydrogen production
Methanol
Calcination atmosphere
X-ray photoelectron spectroscopy
SDGs
Publisher
National Taiwan University Dept Chem Engn
Type
journal article
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