Hierarchically porous LaFeO3 perovskite prepared from the pomelo peel bio-template for catalytic oxidation of NO
Hierarchically porous LaFeO3 perovskite prepared from the pomelo peel bio-template for catalytic oxidation of NO
复制标题
柚皮生物模板制备分级多孔LaFeO3钙钛矿用于催化氧化NO
DOI：
10.1016/j.jpcs.2017.12.057
复制
发表时间：
2018
影响因子：
4
通讯作者：
李星
中科院分区：
文献类型：
--
作者：
赵少俊;王丽;王颖;李星
本文以柚皮为生物模板，制备了层次化多孔lafeo3钙钛矿，用于催化NO氧化为NO2。x射线衍射（XRD）、扫描电镜（SEM）、n2吸附-解吸分析、x射线光电子能谱（XPS）、NO程序升温解吸（NO- tpd）、采用氧程序升温解吸（O2-TPD）和氢程序升温还原（H2-TPR）研究了柚皮生物模板制备的分层多孔lafeo3钙钛矿和未添加生物模板的lafeo3钙钛矿的微观结构和氧化还原性能。结果表明，层次化多孔lafeo3钙钛矿成功复制了具有高比表面积的柚皮多孔结构。与没有柚皮模板制备的lafeo3钙钛矿相比，在相同条件下，分层多孔lafeo3钙钛矿对NO的催化氧化性能更好。有模板和无模板制备的lafeo3在305 °C和313 °C时的最大NO转化率分别为90%和76%。这主要是由于与没有柚子皮模板制备的样品相比，lafeo3钙钛矿具有更高的Fe4+/Fe3+比例，具有更多吸附氧的层次多孔结构和更高的比表面积。
In this paper, pomelo peel was used as biological template to obtain hierarchically porous LaFeO3perovskite for the catalytic oxidation of NO to NO2. In addition, X-ray diffraction (XRD), scanning electron microscopy (SEM), N2adsorption–desorption analyses, X-ray photoelectron spectra (XPS), NO temperature-programmed desorption (NO-TPD), oxygen temperature-programmed desorption (O2-TPD) and hydrogen temperature-programmed reduction (H2-TPR) were used to investigate the micro-structure and the redox properties of the hierarchically porous LaFeO3perovskite prepared from pomelo peel biological template and the LaFeO3perovskite without the biological template. The results indicated that the hierarchically porous LaFeO3perovskite successfully replicated the porous structure of pomelo peel with high specific surface area. Compared to the LaFeO3perovskite prepared without the pomelo peel template, the hierarchically porous LaFeO3perovskite showed better catalytic oxidization of NO to NO2under the same conditions. The maximum NO conversions for LaFeO3prepared with and without template were 90% at 305 °C and 76% at 313 °C, respectively. This is mainly attributed to the higher ratio of Fe4+/Fe3+, the hierarchically porous structure with more adsorbed oxygen species and higher surface area for the hierarchically porous LaFeO3perovskite compared with the sample prepared without the pomelo peel template.