CO2 photoreduction with H2O vapor on highly dispersed CeO2/TiO2 catalysts: Surface species and their reactivity
Wang, Y (Wang, Yun); Zhao, J (Zhao, Jie); Wang, TF (Wang, Tianfu); Li, YX (Li, Yingxuan); Li, XY (Li, Xiyou); Yin, J (Yin, Jiao); Wang, CY (Wang, Chuanyi); Zhao, J
2016
发表期刊JOURNAL OF CATALYSIS
卷号337期号:5页码:293-302
摘要Weak interaction between TiO2 and CO2 molecules is detrimental to CO2 photoreduction. To alleviate this drawback, ceria is usually exploited as a basic promoter, but fundamental insights into the correlation of ceria-tuned CO2 adsorption and the resulting activity of photoreduction are lacking. In this work, highly dispersed CeO2/TiO2 and bare TiO2 catalysts were fabricated and their structural, surface, and optical properties and activity for CO2 photoreduction were explored. Microcalorimetric measurement and in situ infrared spectroscopy were used to reveal the strengths and states of CO2 adsorption and the course of photoreduction of CO2 with H2O vapor. Monodentate carbonate (m-CO32-), bidentate carbonate (b-CO32-), and bidentate bicarbonate (b-HCO3-) are found to be the main surface species for the coadsorption of CO2 and H2O on catalyst surfaces. The presence of CeO2 containing Ce3+ strengthens the bonding of CO2 with catalyst surfaces and increases the production of b-CO32- and b-HCO3- species. Unlike m-CO32-, b-CO32- and b-HCO3- surface species could readily be transformed to surface CO2- in the presence of H2O under simulated sunlight irradiation. This might be attributed to the fact that the CO2 segment in the two species is bound to Ti/Ce atoms that have reductive capabilities under photoirradiation. In addition, the presence of CeO2 containing Ce3+ facilitates photogenerated charge separation. As a result, ceria-tuned CO2 adsorption and enhanced charge separation are jointly responsible for the increased activity of CeO2/TiO2 catalysts. (C) 2016 Elsevier Inc. All rights reserved.
关键词Co2 Photoreduction Basic Oxide Ceo2 Co2 Adsorption
DOI10.1016/j.jcat.2015.12.030
收录类别SCI
WOS记录号WOS:000374920400031
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被引频次:29[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.xjipc.cas.cn/handle/365002/4544
专题中国科学院特殊环境功能材料与器件重点试验室
通讯作者Zhao, J
作者单位Chinese Acad Sci, Key Lab Funct Mat & Devices Special Environm, Xinjiang Tech Inst Phys & Chem, Lab Environm Sci & Technol LEMST, Urumqi 830011, Xinjiang, Peoples R China;Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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Wang, Y ,Zhao, J ,Wang, TF ,et al. CO2 photoreduction with H2O vapor on highly dispersed CeO2/TiO2 catalysts: Surface species and their reactivity[J]. JOURNAL OF CATALYSIS,2016,337(5):293-302.
APA Wang, Y .,Zhao, J .,Wang, TF .,Li, YX .,Li, XY .,...&Zhao, J.(2016).CO2 photoreduction with H2O vapor on highly dispersed CeO2/TiO2 catalysts: Surface species and their reactivity.JOURNAL OF CATALYSIS,337(5),293-302.
MLA Wang, Y ,et al."CO2 photoreduction with H2O vapor on highly dispersed CeO2/TiO2 catalysts: Surface species and their reactivity".JOURNAL OF CATALYSIS 337.5(2016):293-302.
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