文献类型：期刊文献

中文题名：La0.9Rb0.1Co1-xFexO3-δ钙钛矿催化剂上NOx辅助碳烟燃烧性能的研究

英文题名：Catalytic Performances of La0.9Rb0.1Co1-xFexO3-δ Perovskite-Type Catalysts for NOx-Assisted Sootcombustion

作者：车祥[1];汪炜[1];商周[1];王丽[1];郭耘[1];卢冠忠[1]

机构：[1]华东理工大学工业催化研究所

年份：2018

卷号：42

期号：6

起止页码：650

中文期刊名：稀有金属

外文期刊名：Chinese Journal of Rare Metals

收录：CSTPCD;;EI(收录号：20183805817833);Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金：国家科技部863计划项目(2015AA034603);国家自然科学基金项目(21333003)资助

语种：中文

中文关键词：钙钛矿;La0.9Rb0.1Co1-xFexO3-δ;NOx辅助碳烟燃烧;NOx储存

外文关键词：perovskite;La0.9Rb0.1Co1-xFexO3-δ;NOx-assisted sootcombustion;NOx storage

摘要：通过柠檬酸溶胶凝胶法制备了La0.9Rb0.1Co1-xFexO3-δ（x=0.1～0.8）系列钙钛矿催化剂。通过X射线衍射（XRD）、氢气程序升温还原（H2-TPR）、NOx程序升温脱附（NOx-TPD）及X射线光电子能谱（XPS）考察了Fe含量变化对催化剂结构、NOx辅助碳烟燃烧反应活性、催化剂氧化还原活性、催化剂表面Fe和Co的化学状态以及NOx储存能力的影响。结果表明：所制备的催化剂均保持钙钛矿结构,Co与Fe的共掺杂改变了B位金属的化学状态,催化剂表面存在Co2＋和更高价态的Fe物种。相比纯LaCoO3和LaFeO3,La0.9Rb0.1Co1-xFexO3-δ（x=0.1～0.8）催化剂碳烟燃烧的特征温度T50分别下降约30和70℃,碳烟燃烧的速度也随之加快。同时,在NOx辅助碳烟燃烧过程中,NO氧化所生成的NO2可与碳烟反应生成N2,其中La0.9Rb0.1Co0.6Fe0.4O3-δ催化剂具有最高的NOx消除能力,在381℃时达到36.4%。
A series of La0.9Rb0.1Co1-xFexO3-δ（x = 0. 1 ～ 0. 8） perovskite-type catalysts were prepared via citric acid sol-gel method.X-ray diffraction（XRD）,hydrogen temperature programmed reduction（H2-TPR）,NOx temperature programmed desorption（NOxTPD） and X-ray photoelectron spectroscopy（XPS） were used to investigate the effects of doping Fe on the structures,activities for NOx-assisted sootcombustion,surface properties of catalysts. The results showed that the prepared samples showed perovskite structure,and co-doping of Fe and Co could modify the chemical states of B sites and produce Co2＋ and high valence Fe specieson the surface. Compared with pure LaCoO3 and LaFeO3,the T50 of soot combustion on La0.9Rb0.1Co1-xFexO3-δ（x = 0. 1 ～ 0. 8） catalysts decreased by 30 and 70 ℃,respectively,and the combustion rate of soot was also promoted. Meanwhile,the NO2 formed by the oxidation of NO could react with soot to produce N2 during the process of NOxassisted soot combustion. Among them,La0.9Rb0.1Co0.6Fe0.4O3-δ behaved the highest removal efficiency of NOx,reaching 36. 4% at 381 ℃.