不同Fe含量改性CeO_(2)纳米管负载金催化CO氧化

Gold supported on modified CeO_(2)nanotubes with different Fe contents for CO catalytic oxidation

为了提高C0氧化的活性.改善其催化性能.制备了不同含量Fe改性的CeO_(2)納米管(Ce0_(2)NTs)负载金催化剂.探究了载体(Fe_(0.1)Ce_(0.9)O_(2)NTs和Fe_(0.2)Ce_(0.8)O_(2)NTs)中Fe含最的变化对于催化C0氧化的性能影响。采用不同n(Fe)/n(Ce)比例(1:9和2:8)的Fe_(x)Cen_(1-x)O_(2)纳米管作为载体将金纳米颗粒(Au NPs)负载在载体上。研究表明:适量的Fe离子(n(Fe)/n(Ce)=1:9)掺杂有利于活性的提高,掺杂10%Fe的催化剂在110°C即可使C0完全氧化。通过H_(2)-TPR等表征手段发现,当Fe的含最为10%的时候,健化剂的还原温度比Au/Fe_(0.2)Ce_(0.8)O_(2)NTs更低,适当的Fe含量(10%)可以降低CeO_(2)的表面氧活性物种的还原温度,这些都使得Aw/Fe_(0.1)Ce_(0.9)O_(2)NTs比An/FenaCen,O2NTs的催化活性更好.可以在更低的温度下(110°C)将CO完全转化。

To improve the activity of CO oxidation and its ceatalytic performance.gold nanoparticles supported.on CeO_(2)nanotubes(CeO_(2)NTs)with diferent Fe contents were designed and prepared.The ffeets of diferent Fe contents molifying carriers(Fe_(0.1)Ce_(0.9)O_(2)NTs and Fe_(0.2)Ge_(0.8)O_(2)NTs)on the catalytie properties were investigated.CeO_(2)nanoubes with diferent n(Fe)/n(Ge)ratios(1:9 and 2:8)were used as earriers to loud Au nanoparti-cles(Au NPs).It was found that appropriate amount of Fe ion(n(Fe)/n(Ce)=1:9)doping was beneficial to im-prove the activity.ts conversion rate of C0 oxidation can reach to 100%at 110°C.H2-TPR and other characteriza-tion methods showed that the reduction lemperature of the eatalysts was lower than Au/Fe_(0.2)Ge_(0.8)O_(2)NTs,when Fe contents was 10%.The appropriate Fe contents(10%)can reduce the reduction termperature of surface oxygen ac-tive species of CeO_(2).Jt made Au/Fe_(0.1)Ce_(0.9)O_(2)NTs had better ceatalytic activity than Au/Fe_(0.2)Ce_(0.8)O_(2)NTs,complely converting CO at a lower temperature(110°C).