层状K-Fe-Ti金属氧化物上光催化分解水制氢  

Photocatalytic Hydrogen Evolution from Water over Layered K-Fe-Ti Metal Oxides

作　　者：桑丽霞[1] 李群伟[1] 马重芳[1] 胥利先[1] 孙继红[2] 戴洪兴[2] 何洪[2] 

机构地区：[1]北京工业大学传热强化与过程节能教育部重点实验室及传热与能源利用北京市重点实验室,北京100022 [2]北京工业大学环境与能源工程学院化工化学系,北京100022

出　　处：《催化学报》2006年第10期880-884,共5页

基　　金：国家重点基础研究发展计划(2003CB214500)资助项目

摘　　要：采用高温固相反应法合成了层状K-Fe-Ti金属氧化物催化剂,用X射线衍射、扫描电子显微镜、透射电子显微镜和紫外-可见漫反射光谱等手段对催化剂进行了表征,并通过光催化分解水制氢反应对催化剂的活性进行了评价.结果表明,合成原料中K+的含量和固相反应温度都会影响催化剂的晶相结构;催化剂中八面体配位的Fe3+使其具有显著的可见光吸收特性,但增加合成原料中Fe3+的量仅增加孤立的Fe2O3物种;在草酸的偶合作用下,正交晶相的催化剂光催化分解水的产氢速率高于四方晶相的催化剂,但后者的产氢速率稳定性高于前者.Layered K-Fe-Ti metal oxide catalysts with different K：Fe：Ti molar ratios were synthesized by the conventional solid-state reaction and characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and UV-Vis diffuse reflectance spectroscopy. There were two kinds of crystal structure in the catalysts, tetragonal and orthorhombic symmetry phases, which is related to the amount of interlayer K^＋ ions and solid-state reaction temperature, In the UV-Vis diffuse reflectance spectra of the catalysts, the absorption peaks in the visible region appeared, and the absorption peaks at 400--550 nm were attributed to the octahedral Fe^3＋ species, Moreover, the excessive amount of Fe^3＋ ions in the materials could increase the isolated Fe2O3 species but could not affect the crystal structure of catalyst. In the presence of the electron donor, H2C2O4, the catalyst with the orthorhombie crystal phase exhibited higher photocatalytic activity for water splitting than that with the tetragonal crystal phase, but the latter showed better reaction stability for the hydrogen evolution from water.

关 键 词：层状金属氧化物 固相反应 光催化 氢 

分 类 号：O643.36[理学—物理化学]