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The construction of three-dimensionally ordered macroporous (Fe, Zn, Cu, Co)/LaMnO3 with controllable gelation rate and their catalytic combustion properties
Journal of Porous Materials ( IF 2.6 ) Pub Date : 2019-05-27 , DOI: 10.1007/s10934-019-00766-2
Chao Ren , Zhihua Zhang , Renchun Yang

The gelation rate of LaMnO3 colloid was successfully modulated by introducing trace of tartaric acid and nitric acid simultaneously to construct 3DOM LaMnO3. To enhance surface oxygen vacancies, Fe, Zn, Cu and Co metal oxides were introduced on the surface of 3DOM LaMnO3 to modulate their surface composition, respectively. The morphology, crystalline, composition and reducibility of the prepared catalysts were characterized by SEM, XRD, XPS and TPR, respectively. The results showed that the surface oxygen defects can be enhanced distinctly with the introduction of metal oxides. Among the four metal oxides modified LaMnO3, the Co/LaMnO3 sample exhibited highest oxygen defects content and lowest reduction temperature. The catalytic properties of the five samples follow as the order: LaMnO3 < Fe/LaMnO3 < Zn/LaMnO3 ≈ Cu/LaMnO3 < Co/LaMnO3, which is consisted with that of their surface oxygen vacancies content, indicating that oxygen vacancies content is a crucial factor on catalytic oxidation of ethyl acetate.



中文翻译:

三维有序大孔(Fe,Zn,Cu,Co)/ LaMnO的构造3 可控的胶凝速率及其催化燃烧性能

同时引入痕量酒石酸和硝酸成功地调控了LaMnO 3胶体的胶凝速率,从而构建了3DOM LaMnO 3。为了提高表面氧空位,在3DOM LaMnO 3的表面上分别引入了Fe,Zn,Cu和Co金属氧化物,以调节其表面组成。分别用SEM,XRD,XPS和TPR对制备的催化剂的形貌,结晶,组成和还原性进行了表征。结果表明,引入金属氧化物可以明显提高表面氧缺陷。在四种金属氧化物改性的LaMnO 3中,Co / LaMnO 3样品显示出最高的氧缺陷含量和最低的还原温度。五个样品的催化性质遵循的顺序:的LaMnO 3  <铁/的LaMnO 3  <的Zn /的LaMnO 3  ≈铜/的LaMnO 3  <钴/的LaMnO 3,这是由具有其表面的氧空位含量的,表明氧空位含量是乙酸乙酯催化氧化的关键因素。

更新日期:2019-05-27
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