期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 721, 期 -, 页码 405-410出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.05.314
关键词
Hydrogen production; Photocatalysis; Water splitting; Photoreforming; Platinum-TiO2; Reaction temperature
资金
- panish Government Research Program,FEDER [MAT2013-42407-R, MAT2016-80933]
- FundaciOn CajaCanarias
- Spanish Ministry of Economy and Competitiveness [FPDI-2013-16895]
TiO2 nano-particles based photocatalysts were modified with different Pt percentages photodeposited on the surface, optimizing the method in order to obtain the best performance for the production of hydrogen. For testing hydrogen production, a novel reaction setup equipped with an elliptical cylindrical reflector to focus the radiation on the reactor has been used, being possible to control the reaction temperature. The hydrogen production has been measured in continuous by means of mass spectrometry. The effects of the reaction temperature and of the sacrificial reagent (methanol, ethanol or isopropanol) on the photocatalytic activity of Pt-TiO2 were studied. The best results at 25 degrees C were achieved for 2 wt% Pt-TiO2 (2Pt-Ti0(2)) using methanol as sacrificial reagent, with a large maximum production over 16.0 mmol g(-1)h(-1), which decreases to the half of this value after a long period of 72 h. These H-2 production rates are larger, by a factor close to 30, than the ones obtained for the commercial P25 TiO2 in the same experimental conditions. The effect of the reaction temperature was analyzed on 2Pt-Ti0(2)/water and 2Pt-Ti0(2)/water/MeOH systems in the temperature range 5-60 degrees C. The apparent activation energy was determined for both photocatalysts, obtaining values of 17.5 and 23.3 kJ mol(-1), respectively. The hydrogen production increases continuously with temperature in this range, achieving at 60 degrees C a H-2 production of 0.83 and 38.0 mmol g(-1)h(-1) for the photocatalyst in water and water/MeOH, respectively, after 2 h of reaction time. (C) 2017 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据