Photocatalytic conversion of CO2 in water over Ag-modified La2Ti2O7

被引：134

作者：

Wang, Zheng ^{[1
]}

Teramura, Kentaro ^{[1
,2
,3
]}

Hosokawa, Saburo ^{[1
,2
]}

Tanaka, Tsunehiro ^{[1
,2
]}

机构：

[1] Kyoto Univ, Grad Sch Engn, Dept Mol Engn, Kyoto 6158510, Japan

[2] Kyoto Univ, Elements Strategy Initiat Catalysts & Batteries E, Nishikyo Ku, Kyoto 6158245, Japan

[3] Japan Sci & Technol Agcy JST, Precursory Res Embryon Sci & Technol PRESTO, Kawaguchi, Saitama 3320012, Japan

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2015年 / 163卷

基金：

日本科学技术振兴机构;

关键词：

Conversion of CO2 to CO; La2Ti2O7; photocatalyst; Evolution of O-2; Isotope labeling; CARBON-DIOXIDE; REDUCTION; H-2; PHOTOREDUCTION;

D O I：

10.1016/j.apcatb.2014.07.052

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We have found that Ag-modified La2Ti2O7 with a layered perovskite structure exhibits activity for the photocatalytic conversion of CO2 to CO in pure water. The evolution of O-2 proves that H2O works as an electron donor for the photocatalytic conversion of CO2. CO was generated as the main product, and CO, H-2, and O-2 were produced in stoichiometric amounts. The crystallite size of La2Ti2O7 increased and the surface area decreased with increasing calcination temperature and time. Maximization of the photocatalytic activity of La2Ti2O7 was accomplished by making a trade-off between the crystallite size and surface area. In addition, the loading amount and modification method of the Ag cocatalyst also influenced the amount of CO evolved. An isotope labeling experiment using (CO2)-C-13 confirmed that the origin of evolved CO was not the residual carbon species on the La2Ti2O7 surface, but was rather the CO2 gas that was introduced during the experimental process. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：241 / 247

页数：7

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