Photocatalytic reduction of CO2 by Pt-loaded TiO2 in the mixture of sub- and supercritical water and CO2
Photocatalytic reduction of CO2 by Pt-loaded TiO2 in the mixture of sub- and supercritical water and CO2
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DOI：
10.1016/j.supflu.2016.05.031
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发表时间：
2017-02-01
影响因子：
3.9
通讯作者：
Chikada, Masashi
中科院分区：
文献类型：
--
作者：
Kornetani, Noritsugu;Hirata, Shoutarou;Chikada, Masashi
在400 ℃和30 MPa的温度和压力下，研究了载铂TiO 2在CO2和水的混合物中光催化还原CO2的作用。在30 MPa的恒定压力下，当温度从300 ℃升高到400 ℃时，观察到CO、CH 4、HCOOH和HCHO的产率突然增加。这是由于在超临界条件下形成了水和CO2的均匀单相混合物，从而提高了CO2的还原效率。相反，水还原产生的H-2的产率表现出单调增加，因为光催化反应的热加速。结果表明，反应介质相态的控制是决定水光催化还原CO2转化效率的关键。(C)2016爱思唯尔B. V.保留所有权利。
Photocatalytic reduction of CO2 by Pt-loaded TiO2 in the mixture of CO2 and water has been examined as a function of temperature and pressure up to 400 degrees C and 30 MPa. The abrupt increase in the yields of CO, CH4, HCOOH and HCHO was observed as temperature was elevated from 300 to 400 degrees C at a constant pressure of 30 MPa. This is attributed to the formation of uniform single phase mixture of water and CO2 under supercritical condition, leading to the enhanced efficiency of CO2 reduction. In contrast, the yield of H-2 produced by water reduction showed a monotonous increase with temperature because of the thermal acceleration of photocatalytic reaction. It is suggested that the control of the phase state of reaction medium has a key role in the determination of conversion efficiency for the photocatalytic reduction of CO2 with water. (C) 2016 Elsevier B.V. All rights reserved.