Wavelength Effect on Photocatalytic Reduction of CO(2) by Ag/TiO(2) Catalyst

0363297 - ÚCHP 2012 RIV CN eng J - Journal Article
Kočí, K. - Zatloukalová, K. - Obalová, L. - Krejčíková, Simona - Lacný, Z. - Čapek, L. - Hospodková, Alice - Šolcová, Olga
Wavelength Effect on Photocatalytic Reduction of CO(2) by Ag/TiO(2) Catalyst.
Chinese Journal of Catalysis. Roč. 32, 5/SI/ (2011), s. 812-815. ISSN 0253-9837. E-ISSN 1872-2067.
[6th International Conference on Environmental Catalysis (6th ICEC). Beijing, 12.09.2010-15.09.2010]
R&D Projects: GA ČR GA104/09/0694
Institutional research plan: CEZ:AV0Z40720504; CEZ:AV0Z10100521
Keywords : silver doping * titania * carbon dioxide reduction * photocatalysis * wavelength
Subject RIV: CI - Industrial Chemistry, Chemical Engineering
Impact factor: 1.171, year: 2011

Photocatalytic reduction of CO(2) by water was performed in the presence of a Ag/TiO(2) 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 TiO(2). 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 CO(2) photocatalytic reduction.
Permanent Link: http://hdl.handle.net/11104/0199278