光催化
材料科学
甲醇
金属
兴奋剂
杂质
吸收边
半导体
带隙
吸附
吸收(声学)
甲烷
无机化学
催化作用
分析化学(期刊)
化学工程
化学
物理化学
冶金
光电子学
复合材料
生物化学
有机化学
色谱法
工程类
作者
Kamila Kočí,Klara Mateju,Lucie Obalová,Simona Krejčíková,Zdeněk Lacný,Daniela Plachá,Libor Čapek,A. Hospodková,Olga Šolcová
标识
DOI:10.1016/j.apcatb.2010.02.030
摘要
Pure TiO2 and various silver-enriched TiO2 powders were prepared by the sol–gel process controlled in the reverse micellar environment. The catalysts were tested in CO2 photocatalytic reduction and characterized by X-ray diffraction (XRD), nitrogen adsorption measurement and UV–vis. Methane and methanol were the main reduction products. The yield of methane and methanol increases when modifying the TiO2 by silver incorporation is caused by two mechanisms: up to 5% of Ag in TiO2 the Ag impurity band inside the TiO2 bandgap decreases the absorption edge and increases so the electron–hole pair generation, above 5% of Ag in TiO2 Ag metallic clusters are formed in TiO2 crystals with Shottky barrier at the metal–semiconductor interface, which spatially separates electron and holes and increases their lifetime (decreases probability of their recombination).
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