摘要
采用简单的浸渍-煅烧法制备了Au/Ga_2O_3催化剂.通过粉末X射线衍射、扫描电镜和光电子能谱表征,发现所制备的Au/Ga_2O_3形貌呈棒状、Ga_2O_3以a和b两种晶相存在、Au以金属态形式存在.以催化还原芳香族硝基化合物为探针反应研究发现,Au/Ga_2O_3能显著促进对硝基苯胺催化还原得到对苯二胺,反应10 min,转化率达82.8%;同时也能促进对硝基苯酚催化还原为对胺基苯酚,反应10 min,转化率达96.0%.
Au/Ga_2O_3 catalyst was prepared by the simple method of impregnation-calcination.The morphology was rod-like,the presence of surface of Au species existed in a metallic state and two crystal forms ofaandbof the prepared Au/Ga_2O_3 were confirmed by the characteristics of X-ray diffraction(XRD),scanning electron microscope(SEM)and X-ray photoelectron spectroscopy(XPS).The results showed that Au/Ga_2O_3 significantly improved efficiency in catalytic reduction of p-nitroaniline to p-phenylen ediamine;the conversion was 82.8%during the 10 minutes reaction time when the catalytic reduction of aromaticnitro compounds was used as a probe reaction;it also promoted the catalytic reduction of p-nitrophenol to p-aminophenol,and the conversion was 96.0% during the 10-minute reaction time.
引文
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