Doping-induced Structural Transformations in Maghemite for Enhanced Ortho-Para Hydrogen Conversion

IF 5.2 2区 化学 Q1 CHEMISTRY, APPLIED
Jiuyi Wang , Caizhen Yue , Jian zhao , Xiong Zhang , Shifu Wang , Zheng Shen , Nan Yin , Xiaofeng Yang , Guodong Liu , Xuning Li , Yanqiang Huang , Tao Zhang
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引用次数: 0

Abstract

Ortho-para hydrogen (o-p H2) conversion is a critical process for liquid hydrogen storage and transportation. Developing efficient catalysts for such process is the key at the heart of hydrogen economy while limited by the puzzling structure/reactivity correlation. In this contribution, a series of secondary transition metal doped Fe2O3 nanoparticles (M-Fe2O3, M = Cu, Ni, Zn) were controllably prepared via a simple thermal treatment approach and thoroughly characterized for clarifying the structure-function relationship toward o-p H2 conversion. The reaction rate for o-p H2 conversion reaction rate for o-p H2 conversion over Fe2O3 was significantly enhanced by doping with Cu (0.41x10−3 kmol L−1 s−1) and Ni (0.32x10−3 kmol L−1 s−1), showing notably higher compared to that of Zn-Fe2O3 (0.13x10−3 kmol L−1 s−1). Results from Mössbauer measurements revealed that doping with Cu and Ni increases the proportion of Fe3+ in tetrahedral-site (A-site) of γ-Fe2O3, which is responsible for the enhanced o-p H2 conversion. Furthermore, the higher specific surface area resulting from Cu and Ni doping were also demonstrated as non-innocent factor involved in o-p H2 conversion due to enhanced active sites exposure and H2 diffusion. Our work clarifies the crucial role of transition metal doping in iron oxides for enhancing o-p H2 catalytic conversion, which may pave the way for the development of novel efficient o-p H2 conversion catalysts for advancing the broader utilization of hydrogen energy.
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来源期刊
Catalysis Today
Catalysis Today 化学-工程:化工
CiteScore
11.50
自引率
3.80%
发文量
573
审稿时长
2.9 months
期刊介绍: Catalysis Today focuses on the rapid publication of original invited papers devoted to currently important topics in catalysis and related subjects. The journal only publishes special issues (Proposing a Catalysis Today Special Issue), each of which is supervised by Guest Editors who recruit individual papers and oversee the peer review process. Catalysis Today offers researchers in the field of catalysis in-depth overviews of topical issues. Both fundamental and applied aspects of catalysis are covered. Subjects such as catalysis of immobilized organometallic and biocatalytic systems are welcome. Subjects related to catalysis such as experimental techniques, adsorption, process technology, synthesis, in situ characterization, computational, theoretical modeling, imaging and others are included if there is a clear relationship to catalysis.
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