Photocatalytic transformation of CO2 to CH4 and CO on acidic surface of TiO2 anatase

0452641 - ÚFCH JH 2017 RIV NL eng J - Journal Article
Civiš, Svatopluk - Ferus, Martin - Knížek, Antonín - Kubelík, Petr - Kavan, Ladislav - Zukalová, Markéta
Photocatalytic transformation of CO2 to CH4 and CO on acidic surface of TiO2 anatase.
Optical Materials. Roč. 56, JUN 2016 (2016), s. 80-83. ISSN 0925-3467. E-ISSN 1873-1252
R&D Projects: GA MŠMT LD14115; GA ČR GA13-07724S; GA ČR(CZ) GA14-12010S
Grant - others:COST(XE) CM1104
Institutional support: RVO:61388955
Keywords : methane * titanium dioxide * acidic catalysis
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 2.238, year: 2016

Recently, many studies have demonstrated that carbon dioxide can be converted to methane on TiO2 surface by a photocatalytic process. We show that such a photo-reduction can be significantly affected by the presence of an acidic proton in powder samples of titania. Using in situ absorption gas-phase rovibrational spectroscopic detection of CH4, CO and CO2, we demonstrate that proton enhancement positively affects transformation of intermediate derivatives to methane during the photo-irradiation process via several reactions in which the electron transfer inside titania is coupled to oxygen transfer to the Ti3+ centers of TiO2 structure. The yield of CH4 or CO depends on the surface conditioning of titania: the formation of CH4 is boosted by a presence of adsorbed HCl, while the formation of CO is boosted by adsorbed H2SO4.
Permanent Link: http://hdl.handle.net/11104/0253650