The effect of copper and silver on the properties of Au-ZnO catalyst and its activity in glycerol oxidation

被引:37
作者
Kaskow, Iveta [1 ]
Decyk, Piotr [1 ]
Sobczak, Izabela [1 ]
机构
[1] Adam Mickiewicz Univ, Fac Chem, Umultowska 89b, PL-61614 Poznan, Poland
关键词
ZnO; AuCu and AuAg systems; Interactions between metals; Glycerol oxidation; SUPPORTED GOLD CATALYSTS; LIQUID-PHASE OXIDATION; CO OXIDATION; SELECTIVE OXIDATION; BIMETALLIC NANOPARTICLES; ALLOY NANOPARTICLES; METHANOL OXIDATION; AU-AG/SBA-15; CATALYST; MODIFIED SBA-15; AG;
D O I
10.1016/j.apsusc.2018.02.285
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The goal of this work was to use ZnO as a support for gold and copper (Au-Cu system) or gold and silver (Au-Ag system) and comparison of the effect of copper and silver on the properties of gold and its activity in glycerol oxidation with oxygen in the liquid phase. The samples prepared were fully characterized by XRD, TEM techniques and UV-vis, XPS, ESR spectroscopic methods. It was found that the introduction of copper and silver changed the electronic state of gold loaded on ZnO by the electron transfer between metals. Three different metallic gold species were identified in calcined catalysts: (Au degrees)(delta-) (Au-ZnO), (Au degrees)(eta) (AuCu-ZnO) and (Au degrees)(gamma) (AuAg-ZnO), where delta, eta, gamma indicate a different partial negative charge on metallic gold and gamma > delta > eta. The results showed that (Au degrees)eta centers (metallic gold with the lowest negative charge) formed on AuCu-ZnO were the most active in glycerol oxidation. The increase in the negative charge on metallic gold loaded on AuAg-ZnO reduced the gold activity in silver containing sample. The glyceric acid adsorption and desorption rate influenced the selectivity of the catalysts. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码:197 / 207
页数:11
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