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Photocatalytic H2 production on TiO2 with tuned phase structure via controlling the phase transformation

Published online by Cambridge University Press:  30 August 2012

Yi Ma ,
Qian Xu ,
Ruifeng Chong  and
Can Li
Yi Ma
Affiliation:
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China; Division of Solar Energy, Dalian National Laboratory for Clean Energy, Dalian 116023, China; and Graduate University of Chinese Academy of Sciences, Beijing 100049, China
Qian Xu
Affiliation:
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;and Division of Solar Energy, Dalian National Laboratory for Clean Energy, Dalian 116023, China
Ruifeng Chong
Affiliation:
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China; Division of Solar Energy, Dalian National Laboratory for Clean Energy, Dalian 116023, China; and Graduate University of Chinese Academy of Sciences, Beijing 100049, China
Can Li*
Affiliation:
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China; and Division of Solar Energy, Dalian National Laboratory for Clean Energy, Dalian 116023, China
*
a)Address all correspondence to this author. e-mail: canli@dicp.ac.cn
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Abstract

A series of TiO2 samples were prepared from the precursor P25 using impregnation method followed by a calcination. The phase compositions of the samples were controlled by addition of various additives, including NaNO3, NaHCO3, Na2SO4, Na3PO4, Na2SiO3, and Na2MoO4. X-ray diffraction patterns demonstrate that the phase transformation from anatase to rutile can be suppressed to a different extent by these additives. Photocatalytic H2 production reactions were performed in methanol aqueous solution. The catalysts, with the addition of NaNO3, NaHCO3, and Na2SO4, show a great improvement in the H2 production activity, while others show a negative effect. This indicates that both the phase structure and the properties of the additives are important for the photocatalytic activity. Infrared spectra of pyridine adsorption on the catalysts reveal that the decreased acidity of the samples may be responsible for the suppressed CO production in the photocatalytic methanol reforming.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 3: Focus Issue: Titanium Dioxide Nanomaterials , 14 February 2013 , pp. 394 - 399
Copyright
Copyright © Materials Research Society 2012

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