An In Situ Temperature-Dependent Study of La2O3 Reactivation Process

doi:10.3389/fchem.2021.694559

	An In Situ Temperature-Dependent Study of La2O3 Reactivation Process
	Zhou, Xiaohong1,2,3 ; Vovk, Evgeny I.1 ; Liu, Yang1 ; Guan, Cairu1 ; Yang, Yong1
	2021-05-31
发表期刊	FRONTIERS IN CHEMISTRY
ISSN	2296-2646
卷号	9
DOI	10.3389/fchem.2021.694559
摘要	Lanthanum-containing materials are widely used in oxidative catalytic and electrocatalytic reactions such as oxidative coupling of methane (OCM) and solid oxide fuel cells (SOFCs). However, many of these materials are highly susceptible to air contamination which means ex situ characterization results generally cannot be associated with their reactivity. In this study, the activation processes of an in situ-prepared bulk La2O2CO3 sample and an ex situ as-prepared La(OH)(3) sample are in situ investigated by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and online mass spectroscopy (MS). Results indicate that the La2O2CO3 sample, during linear heating to 800 degrees C, always contains some carbonates near the surface region, which supports a two-step model of bulk carbonate decomposition through surface sites. The La(OH)(3) sample structure evolution is more complex due to contaminations from air exposure. Together with TGA results, online mass analysis of water and CO2 signal loss showed that three major catalyst structure phase change steps and a preheating up to 800 degrees C are required for the as-prepared material to be transferred to La2O3. This process is carefully investigated combining the three in situ methodologies. XPS and XRD data further reveal transformations of variety of in situ surface structures and forms including hybrid phases with hydroxyl, carbonates, and oxide as the sample heated to different temperatures within the range from 200 to 800 degrees C. The results provide useful insights on the activation and deactivation of La-contained materials.
关键词	in situ XPS in situ XRD online MS La2O3 reactivation
URL	查看原文
收录类别	SCIE
语种	英语
WOS研究方向	Chemistry
WOS类目	Chemistry, Multidisciplinary
WOS记录号	WOS:000661150600001
出版者	FRONTIERS MEDIA SA
原始文献类型	Article
引用统计
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/127531
专题	物质科学与技术学院_博士生物质科学与技术学院_PI研究组_杨永组
通讯作者	Yang, Yong
作者单位	1.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai, Peoples R China; 2.Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, Shanghai, Peoples R China; 3.Univ Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, Beijing, Peoples R China
第一作者单位	物质科学与技术学院
通讯作者单位	物质科学与技术学院
第一作者的第一单位	物质科学与技术学院
推荐引用方式 GB/T 7714	Zhou, Xiaohong,Vovk, Evgeny I.,Liu, Yang,et al. An In Situ Temperature-Dependent Study of La2O3 Reactivation Process[J]. FRONTIERS IN CHEMISTRY,2021,9.
APA	Zhou, Xiaohong,Vovk, Evgeny I.,Liu, Yang,Guan, Cairu,&Yang, Yong.(2021).An In Situ Temperature-Dependent Study of La2O3 Reactivation Process.FRONTIERS IN CHEMISTRY,9.
MLA	Zhou, Xiaohong,et al."An In Situ Temperature-Dependent Study of La2O3 Reactivation Process".FRONTIERS IN CHEMISTRY 9(2021).