Highly selective photocatalytic reduction of carbon dioxide with water over silver-loaded calcium titanate
Highly selective photocatalytic reduction of carbon dioxide with water over silver-loaded calcium titanate
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DOI：
10.1016/j.catcom.2017.06.046
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发表时间：
2017-09-01
影响因子：
3.7
通讯作者：
Yoshida, Hisao
中科院分区：
文献类型：
--
作者：
Anzai, Akihiko;Fukuo, Naoto;Yoshida, Hisao
通过优化Ag负载量和使用常规光化学反应器重新检查了曾经报道的Ag改性CaTiO 3光催化剂。这表明，Ag改性的CaTiO 3光催化剂实际上显示出高的CO产生速率（54 μ mol h（-1））和通过抑制经由水裂解的H-2产生而对CO形成的优异选择性（94%）。这表明，高的光催化性能不仅源于助催化剂的最佳量和高的照射光强度，但也溶解的CO2的高浓度，通过鼓泡流的CO2在较低的反应温度下实现。这些反应条件提供了Ca. 40倍的CO生成率。研究表明，沉积的小颗粒Ag纳米粒子是CO生成的选择性活性中心，而CaTiO 3晶体表面优先生成H-2。
The once reported Ag-modified CaTiO3 photocatalyst was reexamined by optimizing the Ag loading amount and using a conventional photochemical reactor. This revealed that the Ag-modified CaTiO3 photocatalyst actually showed both high production rate of CO (54 mu mol h(-1)) and excellent selectivity towards CO formation (94%) by suppressing the H-2 production via water splitting. It is suggested that the high photocatalytic performance originates from not only the optimized amount of cocatalyst and the high irradiation light intensity but also the high concentration of dissolved CO2 that was achieved by a bubbling flow of CO2 at the lower reaction temperature. These reaction conditions provided ca. 40 times higher CO formation rate. It was proposed that the deposited small Ag nanoparticles are the selective active sites for CO formation and the CaTiO3 crystal surface produces H-2 preferably.