Au/Ga_2O_3的制备及其催化还原芳香族硝基化合物的研究
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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.
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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[3]YANG Minquan,PAN Xiaoyang,ZHANG Nan,et al.A facile one-step way to anchor noble metal(Au,Ag,Pd)nanoparticles on a reduced graphene oxide mat with catalytic activity for selective reduction of nitroaromatic compounds[J].Cryst Eng Comm,2013,15(34):6819-6828.
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[5]LIU Wenjun,SUN Dengrong,FU Jinlong,et al.Assembly of evenly distributed Au nanoparticles on thiolated reduced graphene oxide as an active and robust catalyst for hydrogenation of 4-nitroarenes[J].RSC Adv,2014,4(21):11003-11011.
[6]李亚美,张烨,王秋玲.模板法制备Si O2/Au复合微球及其催化性能评价[J].化工新型材料,2013,41(3):66-68.
[7]张烨,姚璐妍.负载型金磁复合微球催化硝基苯化合物的还原[J].应用化工,2013,42(7):1260-1264.
[8]ZHAO Kun,QI Jian,ZHAO Shenglong,et al.Multiple Au cores in Ce O2 hollow spheres for the superior catalytic reduction of p-nitrophenol[J].Chin J Catal,2015,36(3):261-267.
[9]刘秋文,黄彩进.六方相氮化硼负载铜纳米粒子的制备及其催化还原对硝基苯酚[J].福州大学学报(自然科学版),2016,44(1):129-133.
[10]蔡豪坤,张健,鹿萍,等.高分子微凝胶负载镍催化剂及催化还原芳硝基化合物[J].应用化学,2015,32(8):891-899.
[11]MA Yi Ran,ZHOU Wei,CAO Wei,et al.Preparation of hierarchical Ni@Cu S composites and the application of the enhanced catalysis for 4-nitrophenol reduction[J].Acta Phys Chim Sin,2015,31(10):1949-1955.
[12]PRIMO A,CORMA A,GARCIA H.Titania supported gold nanoparticles as photocatalyst[J].Phys Chem Chem Phys,2011,13(3):886-910.
[13]ZHANG Yanhui,ZHANG Nan,TANG Zirong,et al.Graphene oxide as a surfactant and support for in-situ synthesis of Au-Pd nanoalloys with improved visible light photocatalytic activity[J].J Phys Chem C,2014,118(10):5299-5308.
[14]陈晨,李瑶,焦胜江,等.Au、Ag/氧化石墨烯复合催化体系的制备及催化性能研究[J].化工新型材料,2015,43(4):125-128.