MOF作模板制备多孔Au/Cu_xO催化剂及其CO氧化性能  

MOF-templated preparation of porous Au/Cu_xO catalysts with octahedral structures for CO oxidation

作　　者：刘朋飞[1] 张所瀛[1] 杨祝红[1] 陆小华[1] 

机构地区：[1]南京工业大学化学化工学院,材料化学工程国家重点实验室,江苏南京210009

出　　处：《化工学报》2016年第6期2325-2331,共7页CIESC Journal

基　　金：国家自然科学基金项目(21136001);国家重点基础研究发展计划项目(2013CB733503);江苏高校优势学科建设工程资助项目~~

摘　　要：采用MOF材料作模板,通过在Cu-BTC材料表面预先负载贵金属Au再热解的方法,成功制备了具有正八面体结构的新型多孔Au/Cu_xO负载型催化剂。通过降低热解环境中的O_2浓度,调节氧化时间,实现了Au/Cu-BTC氧化产物组分的调节,分别制得了Au/Cu_2O、Au/Cu_2O-Cu O、Au/CuO复合催化材料。将其用于CO催化氧化,发现所有Au/Cu_xO催化剂都表现出比Cu-BTC和Au/Cu-BTC更优异的催化性能,其中由于拥有较高的比表面积、Cu_2O含量以及更好的Au的分散性,Au/Cu_2O的CO氧化活性最佳,180℃即能实现CO的完全转化。More recently, metal-organic frameworks（MOFs）, as a excellent sacrificial template, have been widely used to fabricate a variety of porous metal oxides with special structures and performances. To take full advantage of MOFs in composition regulation, herein a novel method to prepare porous Au/CuxO composites with octahedral structures inherited from MOFs was introduced. Au/Cu-BTC was firstly prepared by the traditional deposition-precipitation method. Subsequently, pyrolysis of Au/Cu-BTC was conducted in 2%（volume fraction） O_2 balanced with helium. By varying the time of heating, Au/Cu_xO composites including Au/Cu_2O, Au/Cu_2O-CuO and Au/CuO were successfully achieved. When tested in CO oxidation, these supported catalysts exhibited much better catalytic performances than Cu-BTC and Au/Cu-BTC due to the more active support of metal oxides. Thus, Au/Cu_2O showed the best catalytic activity since the high surface area, Cu_2O content and better dispersion of Au.

关 键 词：金属-有机骨架材料 催化剂 纳米结构 多孔材料 Cu-BTC Au/Cu2O 

分 类 号：O643[理学—物理化学] TQ426[理学—化学]