Wavelength Effect on Photocatalytic Reduction of CO2 by Ag/TiO2 Catalyst

doi:10.1016/S1872-2067(10)60199-4

催化学报 ›› 2011, Vol. 32 ›› Issue (5): 812-815.DOI: 10.1016/S1872-2067(10)60199-4

Wavelength Effect on Photocatalytic Reduction of CO₂ by Ag/TiO₂ Catalyst

K. KOCI1,*, K. ZATLOUKALOVA1, L. OBALOVA1, S. KREJCIKOVA2, Z. LACNY1, L. CAPEK3, A. HOSPODKOVA4, O. SOLCOVA2

1Faculty of Metallurgy and Material Engineering, VŠB-Technical University of Ostrava, 17. Listopadu 15, Ostrava, Czech Republic; 2Institute of Chemical Process Fundamentals CAS, Rozvojová 135, Prague, Czech Republic; 3Faculty of Chemical Technology, University of Pardubice, Studentská 95, Pardubice, Czech Republic; 4Institute of Physics of the ASCR, v.v.i., Na Slovance 2, Praha 8, Czech Republic

收稿日期:2010-11-16 修回日期:2010-12-30 出版日期:2011-05-31 发布日期:2014-09-29

Wavelength Effect on Photocatalytic Reduction of CO₂by Ag/TiO₂ Catalyst

K. KOCI1,*, K. ZATLOUKALOVA1, L. OBALOVA1, S. KREJCIKOVA2, Z. LACNY1, L. CAPEK3, A. HOSPODKOVA4, O. SOLCOVA2

1Faculty of Metallurgy and Material Engineering, VŠB-Technical University of Ostrava, 17. Listopadu 15, Ostrava, Czech Republic; 2Institute of Chemical Process Fundamentals CAS, Rozvojová 135, Prague, Czech Republic; 3Faculty of Chemical Technology, University of Pardubice, Studentská 95, Pardubice, Czech Republic; 4Institute of Physics of the ASCR, v.v.i., Na Slovance 2, Praha 8, Czech Republic

Received:2010-11-16 Revised:2010-12-30 Online:2011-05-31 Published:2014-09-29

摘要/Abstract

摘要： Photocatalytic reduction of CO₂ by water was performed in the presence of a Ag/TiO₂ catalyst under illumination by lamps with different wavelengths (254, 365, and 400 nm). The yields of the main products (methane and methanol) were higher with the 254 nm lamp than with the 365 lamp while no products were observed with the 400 nm lamp. This was because the electron-hole generation rate increased with increasing energy of irradiation (decreasing wavelength) and there were higher densities of electron states at higher energies in TiO₂. The increased efficiency of electron-hole generation with a shorter wavelength irradiation increased the efficiency of the catalyst. The energy of the electrons excited by visible light (400 nm) was too low for CO₂ photocatalytic reduction.

关键词: silver doping, titania, carbon dioxide reduction, photocatalysis, wavelength

Abstract: Photocatalytic reduction of CO₂ by water was performed in the presence of a Ag/TiO₂ catalyst under illumination by lamps with different wavelengths (254, 365, and 400 nm). The yields of the main products (methane and methanol) were higher with the 254 nm lamp than with the 365 lamp while no products were observed with the 400 nm lamp. This was because the electron-hole generation rate increased with increasing energy of irradiation (decreasing wavelength) and there were higher densities of electron states at higher energies in TiO₂. The increased efficiency of electron-hole generation with a shorter wavelength irradiation increased the efficiency of the catalyst. The energy of the electrons excited by visible light (400 nm) was too low for CO₂ photocatalytic reduction.

Key words: silver doping, titania, carbon dioxide reduction, photocatalysis, wavelength

K. KOCI, K. ZATLOUKALOVA, L. OBALOVA, S. KREJCIKOVA, Z. LACNY, L. CAPEK, A. HOSPODKOVA, O. SOLCOVA. Wavelength Effect on Photocatalytic Reduction of CO₂ by Ag/TiO₂ Catalyst[J]. 催化学报, 2011, 32(5): 812-815.

K. KOCI, K. ZATLOUKALOVA, L. OBALOVA, S. KREJCIKOVA, Z. LACNY, L. CAPEK, A. HOSPODKOVA, O. SOLCOVA. Wavelength Effect on Photocatalytic Reduction of CO₂by Ag/TiO₂ Catalyst[J]. Chinese Journal of Catalysis, 2011, 32(5): 812-815.

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Wavelength Effect on Photocatalytic Reduction of CO₂ by Ag/TiO₂ Catalyst

Wavelength Effect on Photocatalytic Reduction of CO₂by Ag/TiO₂ Catalyst

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