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Regulating SnO2 surface by metal oxides possessing redox or acidic properties: The importance of active O2−/O22− and acid sites for toluene deep oxidation
Applied Catalysis A: General ( IF 4.7 ) Pub Date : 2020-07-26 , DOI: 10.1016/j.apcata.2020.117755
Yao Guo , Lanling Zeng , Xianglan Xu , Yaqian Liu , Yang Liu , Xiongcong Fu , Zezhou Gao , Zijian Qian , Junwei Xu , Xiuzhong Fang , Xiang Wang

To explore the surface doping effects of metal oxides possessing redox (Cr, Co, Mn) or acidic (In, Bi) properties on SnO2, SnO2 doped by different metal oxides has been designed. All the doping metal oxides disperse finely on the SnO2 support surface, which can improves the reaction activity, obeying the order of 1%Mn/SnO2 > 1%Co/SnO2 > 1%Cr/SnO2 > 1%Bi/SnO2 > 1%In/SnO2 > SnO2. By modifying SnO2 surface with Cr, Co and Mn oxides, both the active surface oxygen (O2 and O22−) and acid sites quantities have been significantly improved, thus resulting in remarkable activity increment. Whereas, by modifying SnO2 surface with In and Bi oxides, only the surface acid sites amount has been improved, hence having limited activity improvement effect. 1%Mn/SnO2 catalyst possesses considerable amount of both types of active sites, thus showing the optimal toluene deep oxidation activity in all the catalysts.



中文翻译:

调节的SnO 2表面由具有氧化还原或酸性性质的金属氧化物:活性的O的重要性2 - / O 2 2-和酸位点为甲苯深度氧化

为了探索具有氧化还原(Cr,Co,Mn)或酸性(In,Bi)性质的金属氧化物对SnO 2的表面掺杂效果,设计了不同金属氧化物掺杂的SnO 2。所有的掺杂金属氧化物都可以很好地分散在SnO 2载体表面上,从而可以提高反应活性,遵循1%Mn / SnO 2 > 1%Co / SnO 2 > 1%Cr / SnO 2 > 1%Bi / SnO 2> 1%In / SnO 2> SnO 2。通过修改的SnO 2以Cr,Co和Mn的氧化物,两种活性表面氧(O表面2 -和O 2 2-)和酸性部位的数量已得到显着改善,从而导致显着的活性增加。然而,通过用In和Bi氧化物修饰SnO 2表面,仅表面酸性部位的量得到了改善,因此活性改善效果有限。1%Mn / SnO 2催化剂具有大量的两种类型的活性位,因此在所有催化剂中均显示出最佳的甲苯深度氧化活性。

更新日期:2020-08-28
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