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Pt-CdS/TiO2 nanotube catalyst for photocatalytic reduction of CO2 with water under visible light irradiation

Published online by Cambridge University Press:  02 August 2011

Jian Yuan ,
Chuanzhao Zhang ,
Caolong Li ,
Mingxia Chen  and
Wenfeng Shangguan
Jian Yuan
Affiliation:
Research Center for Combustion and Environmental Technology, Shanghai Jiao Tong University, Shanghai 200240, P.R. China.
Chuanzhao Zhang
Affiliation:
Research Center for Combustion and Environmental Technology, Shanghai Jiao Tong University, Shanghai 200240, P.R. China.
Caolong Li
Affiliation:
Research Center for Combustion and Environmental Technology, Shanghai Jiao Tong University, Shanghai 200240, P.R. China.
Mingxia Chen
Affiliation:
Research Center for Combustion and Environmental Technology, Shanghai Jiao Tong University, Shanghai 200240, P.R. China.
Wenfeng Shangguan
Affiliation:
Research Center for Combustion and Environmental Technology, Shanghai Jiao Tong University, Shanghai 200240, P.R. China.
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Abstract

Titanate nanotube (TNT) was prepared by alkaline hydrothermal method starting from TiO2 (P25), and then CdS-TNT was prepared for visible light harvesting by immersing TNT in Cd(CH3COO)2 and then (NH2)2CS aqueous solutions subsequently and heat treated at specialtemperature. After loading with Pt, photocatalytic reduction of gas phase CO2 with water vapor was carried out under UV-VIS and visible light irradiation. The results showed that the main reaction products were CH4, C2H4, C2H6 and H2, which were online characterized by gaschromatography when the flow rate of 5000 ppm CO2 is 0.35 ml/min. The hydrogenation process also realized under visible light illumination for Pt-CdS/TNT and producted 0.44 μmol/min CH4. The maximum yield of methane reached about 130 μmol/min when Pt-CdS/TNTwas irradiated with UV-Vis light. The time profile for production yield increased steadily with time up to about 6–7 h, then a decrease of the reaction rate occurred. It is suggested that thadsorption of intermediate products CO, O2 etc. on Pt and the oxidation of Pt might be the reasons for the photocatalytic reaction deterioration.

Keywords

catalytichydrogenationphotochemical
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1326: Symposium F – Renewable Fuels and Nanotechnology , 2011 , mrss11-1326-f03-06
Copyright
Copyright © Materials Research Society 2011

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References

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