Effect of calcination atmosphere on TiO2 photocatalysis in hydrogen production from methanol/water solution

被引：102

作者：

Wu, NL ^{[1
]}

Lee, MS ^{[1
]}

Pon, ZJ ^{[1
]}

Hsu, JZ ^{[1
]}

机构：

[1] Natl Taiwan Univ, Dept Chem Engn, Taipei 106, Taiwan

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 2004年 / 163卷 / 1-2期

关键词：

TiO2; phototcatalysis; hydrogen production; methanol; calcination atmosphere; X-ray photoelectron spectroscopy;

D O I：

10.1016/j.jphotochem.2003.12.009

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 [物理化学]; 081704 [应用化学];

摘要：

TiO2 photocatalysts were synthesized by a sol-gel process followed by calcination at 400degreesC in Ar, air, N-2, H-2 (3% in N-2) and vacuum (similar to5 X 10(-3) torr), respectively. Toward H-2 production from a water/methanol (vol. ratio = 1.4/1) solution, the catalysts exhibited activities in the order, according to calcination atmosphere, of At > air > N-2 > vacuum similar toH(2). The low activity resulting from either vacuum or H-2 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 At calcination is to enhanced visible-light excitation. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：277 / 280

页数：4

共 18 条

[1]

[Anonymous], 2002, HDB CHEM PHYS

[2]

Visible-light photocatalysis in nitrogen-doped titanium oxides [J].