In Situ Structure Study of a TiO2 Doped MnOX-Na2WO4/SiO2 Catalyst Under Na2WO4 Melting Conditions

doi:10.1007/s11244-024-01946-4

	In Situ Structure Study of a TiO2 Doped MnOX-Na2WO4/SiO2 Catalyst Under Na2WO4 Melting Conditions
	Vovk, Evgeny I.1 ; Wang, Danyu1 ; Qiu, Zhehao1 ; Liu, Yang1 ; He, Mingping 2; Zhou, Xiaohong1 ; Guan, Cairu1 ; Yu, Na1 ; Lu, Yong 3; Lang, Junyu1 ; Yang, Yong1
	2024-04
发表期刊	TOPICS IN CATALYSIS
ISSN	1572-9028
EISSN	1572-9028
发表状态	已发表
DOI	10.1007/s11244-024-01946-4
摘要	MnOX-Na2WO4/SiO2 catalyst exhibited notable C2 selectivity/yield in the oxidative coupling of methane (OCM), a promised green chemistry reaction. Nevertheless, the reaction mechanism of this catalyst remains a subject of contention, particularly regarding the role of Na2WO4 in the activation. In this study, in situ characterizations of a TiO2-modified MnOX-Na2WO4/SiO2 catalyst are conducted by XRD and XPS correlating to the OCM reaction condition, focusing on the simultaneous phase transition of catalyst components within its activation temperature zone. The online MS along with XPS/XRD coupled activity study confirm that transition from Mn3+ to Mn2+ stands as a pivotal factor influencing the reactivity. In situ XRD further revealed that in this narrow temperature window there is a particular three-step Na2WO4 phase change, ending as molten salt, right before the substantial Mn3+ to Mn2+ transfer initiated. In addition, the rarely observed Na2WO4 behavior as molten salt is observed by in situ XPS with rapid spectra collected during an on-stage heating process. These comprehensive in situ catalyst characterizations, covering the extensive structure–activity relationship from solid state to partial molten salt condition, supply new important evidence of the active oxygen transfer pathway from Na2WO4 to Mn species which provides a key to understand the activation mechanism of MnOX-Na2WO4/SiO2 catalyst in OCM. Graphical Abstract: (Figure presented.) © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.
关键词	Catalyst selectivity Chemical activation Cost reduction Manganese compounds Methane Silicon Silicon compounds Sodium compounds X ray diffraction X ray photoelectron spectroscopy Green-chemistry In-situ XRD Melting conditions Molten salt Oxidative coupling methane Oxidative coupling of methane Oxidative couplings TiO2 doped MnOX-na2WO4/SiO2 catalyst XRD ]+ catalyst
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收录类别	SCI ; EI
语种	英语
资助项目	National Key R&D Program of China[2023YFB4005200] ; National Natural Science Foundation of China["22272107","22072092","92045301"] ; Analytical Instrumentation Center[SPST-AIC10112914] ; Ministry of Science and Technology (National key R&D Program of China)[2022YFA1503802]
WOS研究方向	Chemistry
WOS类目	Chemistry, Applied ; Chemistry, Physical
WOS记录号	WOS:001196257000003
出版者	Springer
EI入藏号	20241515860607
EI主题词	Titanium dioxide
EI分类号	549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals ; 802.2 Chemical Reactions ; 803 Chemical Agents and Basic Industrial Chemicals ; 804 Chemical Products Generally ; 804.1 Organic Compounds ; 804.2 Inorganic Compounds
原始文献类型	Article in Press
引用统计
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/357363
专题	物质科学与技术学院_PI研究组_杨永组物质科学与技术学院_公共科研平台_分析测试平台物质科学与技术学院_本科生物质科学与技术学院_博士生
共同第一作者	Wang, Danyu
通讯作者	Yang, Yong
作者单位	1.School of Physical Science and Technology, Shanghai Tech University, 393 Huaxia Middle Road, Shanghai, 201210, China 2.Department of Cardiology, Huadong Hospital Affiliated to Fudan University, Shanghai, 200040, China 3.Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, 3663 Zhongshan North Road, Shanghai, 200062, 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	Vovk, Evgeny I.,Wang, Danyu,Qiu, Zhehao,et al. In Situ Structure Study of a TiO2 Doped MnOX-Na2WO4/SiO2 Catalyst Under Na2WO4 Melting Conditions[J]. TOPICS IN CATALYSIS,2024.
APA	Vovk, Evgeny I..,Wang, Danyu.,Qiu, Zhehao.,Liu, Yang.,He, Mingping.,...&Yang, Yong.(2024).In Situ Structure Study of a TiO2 Doped MnOX-Na2WO4/SiO2 Catalyst Under Na2WO4 Melting Conditions.TOPICS IN CATALYSIS.
MLA	Vovk, Evgeny I.,et al."In Situ Structure Study of a TiO2 Doped MnOX-Na2WO4/SiO2 Catalyst Under Na2WO4 Melting Conditions".TOPICS IN CATALYSIS (2024).