摘要
采用沉积沉淀法制备了一系列商业SnO2负载的纳米Au催化剂,通过电感耦合等离子体发射光谱、X射线粉末衍射、透射电镜和X射线光电子能谱等方法研究了溶液酸碱性、沉淀剂种类、Au负载量和焙烧温度等对催化剂性质的影响.结果表明,Au的负载量以及催化剂的焙烧温度对Au颗粒状态有较大影响.其中,于573K焙烧的3%Au/SnO2催化剂在1,4-丁二醇氧化制备γ-丁内酯反应中的催化活性最好,TOF值是Au/TiO2催化剂的15倍.这主要是由于SnO2载体独特的性质对所负载的Au颗粒的影响.
A series of gold catalysts supported on commercial SnO2 were synthesized by deposi-tion-precipitation while accurately controlling pH and precipitant species. The supported catalysts were characterized by X-ray diffraction, inductively coupled plasma atomic emission spectrometry, transmission electron microscopy, and X-ray photoelectron spectroscopy. Gold loading and calcina-tion temperature both affected the dispersion and nature of gold species on SnO2 . The performance of the catalysts in the oxidative lactonization of 1,4-butanediol to γ-butyrolactone was investigated. The catalyst with 3% gold that was calcined at 573 K exhibited the highest activity, which was 15 times higher than that of Au/TiO2 . The excellent catalytic performance was attributed to the high dispersion of gold particles and adequate Au0 and Auδ– species formed because of the strong inter-action between Au and SnO2 and the intrinsic properties of SnO2 .
出处
《催化学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第5期1013-1019,共7页
基金
supported by the National Natural Science Foundation of China(20973042,20903035,21173052)
the National Basic Research Program of China(973 Program,2012CB224804)
the Natural Science Foundation of Shanghai Science and Technology Committee(08DZ2270500)~~
关键词
金催化
二氧化锡
沉积沉淀法
1
4-丁二醇
氧化内酯化
焙烧温度
金负载量
Gold catalyst
Tin dioxide
Deposition-precipitation method
1,4-Butanediol
Oxidative lactonization
Calcination temperature
Gold loading
