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

doi:10.11949/j.issn.0438-1157.20160002

Abstract

Abstract:

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/Cu_xO 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) O₂ balanced with helium. By varying the time of heating, Au/Cu_xO composites including Au/Cu₂O, Au/Cu₂O-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/Cu₂O showed the best catalytic activity since the high surface area, Cu₂O content and better dispersion of Au.

Key words: metal-organic frameworks, catalyst, nanostructure, porous material, Cu-BTC, Au/Cu₂O

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O₂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/Cu₂O、Au/Cu₂O-CuO、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、Cu₂O含量以及更好的Au的分散性,Au/Cu₂O的CO氧化活性最佳,180℃即能实现CO的完全转化。

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

CLC Number:

O643
TQ426

LIU Pengfei, ZHANG Suoying, YANG Zhuhong, LU Xiaohua. MOF-templated preparation of porous Au/Cu_xO catalysts with octahedral structures for CO oxidation[J]. CIESC Journal, 2016, 67(6): 2325-2331.

刘朋飞, 张所瀛, 杨祝红, 陆小华. MOF作模板制备多孔Au/Cu_xO催化剂及其CO氧化性能[J]. 化工学报, 2016, 67(6): 2325-2331.

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