Au-Ag/TiO_2-NB纳米纸催化剂的制备及其在CO低温催化氧化中的应用  

Preparation of Au-Ag / TiO_2-NB Nanopaper Catalyst and Their Application in Catalytic Oxidation of CO at Low Temperature

作　　者：邱凯[1] 张兰春[1] 何淑仁 包南[2] 张晓梅[1] 周爱秋[1] 许效红[1] 

机构地区：[1]山东大学化学与化工学院,山东济南250199 [2]山东大学环境科学与工程学院,山东济南250199

出　　处：《合成化学》2015年第4期293-299,共7页Chinese Journal of Synthetic Chemistry

基　　金：国家自然科学基金资助项目(50925205;21176144;21171106);山东省自然科学基金资助项目(ZR2011BM005);高等学校博士学科点专项科研基金资助项目(20090131110019)

摘　　要：采用连续两步光沉积法,在TiO2纳米带(TiO2-NB)表面沉积双金属Au-Ag纳米颗粒制得Au-Ag/TiO2-NB一维纳米结构,并将其组装成纳米纸多孔催化剂(Cat),其结构、形貌和性能经SEM,TEM,ICP,XRD,XPS和UV-Vis表征。以CO低温催化氧化为探针反应,考察了Ag/Au比(n)和还原预处理温度(T)对Cat催化活性的影响。结果表明:Cat0.8400表现出最佳的催化活性,CO转化率达94%。催化剂的失活是由反应初期极小尺寸的金属纳米颗粒团聚烧结和反应过程中中间产物碳酸盐的生成所致。The Au-Ag / TiO2 nanostructures composed of Ag / Au nanoparticles supported on TiO2nanobelts（TiO2-NB） were prepared by the successive two-step photodeposition method.Au-Ag / TiO2 can be easily assembled into a paper-like porous monolithic catalyst（Cat） which were applied in catalytic oxidation of CO at low temperature.The structures,topography and performance of Cat were characterized by SEM,TEM,ICP,XRD,XPS and UV-Vis.Effect of Ag / Au（n） and pretreated temperature（T） on catalytic activities of Cat were investigated.The results indicated that Cat0.8400 presented the best catalytic activity.The conversion of CO was up to 94%.The deactivation of Cat was caused by aggregation of extremely small-sized nanoparticles at early stage of reaction and accumulation of carbonates.

关 键 词：双金属催化剂 TIO2纳米带 纳米结构 CO氧化 制备 

分 类 号：O643.36[理学—物理化学] O614.12[理学—化学]