Photocatalytic conversion of CO2 in water over Ag-modified La2Ti2O7
Photocatalytic conversion of CO2 in water over Ag-modified La2Ti2O7
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DOI：
10.1016/j.apcatb.2014.07.052
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发表时间：
2015-02-01
影响因子：
22.1
通讯作者：
Tanaka, Tsunehiro
中科院分区：
文献类型：
--
作者：
Wang, Zheng;Teramura, Kentaro;Tanaka, Tsunehiro
我们发现具有层状钙钛矿结构的Ag修饰的La2Ti2O7在纯水中表现出将CO2光催化转化为CO的活性。 O-2的演化证明H2O可以作为CO2光催化转化的电子供体。主要产物为CO，并按化学计量产生CO、H-2 和O-2。随着煅烧温度和时间的增加，La2Ti2O7 的晶粒尺寸增大，表面积减小。 La2Ti2O7 光催化活性的最大化是通过在微晶尺寸和表面积之间进行权衡来实现的。此外，Ag助催化剂的负载量和改性方法也影响CO的释放量。使用(CO2)-C-13的同位素标记实验证实，释放的CO的来源不是La2Ti2O7表面上残留的碳物质，而是实验过程中引入的CO2气体。 (C) 2014 Elsevier B.V. 保留所有权利。
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.