Preparation and application of highly efficient Au/SnO2 catalyst in the oxidative lactonization of 1,4-butanediol to γ-butyrolactone

A series of gold catalysts supported on commercial SnO 2 were synthesized by deposition-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 calcination temperature both affected the dispersion and nature of gold species on SnO 2 . 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/TiO 2 . The excellent catalytic performance was attributed to the high dispersion of gold particles and adequate Au 0 and Au δ− species formed because of the strong interaction between Au and SnO 2 and the intrinsic properties of SnO 2 . 采用沉积沉淀法制备了一系列商业SnO 2 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573 K焙烧的3%Au/SnO 2 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/TiO 2 催化剂的15倍. 这主要是由于SnO 2 载体独特的性质对所负载的Au颗粒的影响. Gold catalysts supported on tin dioxide prepared by deposition-precipitation exhibit high catalytic activity in the oxidative lactonization of 1,4-butanediol.