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Ai W, Gao Y, Xue J, Liu X, Liu H, Wang J, Bai Y. Tracing and elucidating visible-light mediated oxidation and C-H functionalization of amines using mass spectrometry. Chem Commun (Camb) 2020; 56:2163-2166. [PMID: 31970374 DOI: 10.1039/c9cc09629a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The co-existing mechanism of visible light mediated direct oxidation and C-H functionalization of amines was investigated by capturing all the intermediates using online mass spectrometry. The two-step dehydrogenation of amine involving a proton coupled electron transfer (PCET) process was revealed for the first time.
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Affiliation(s)
- Wanpeng Ai
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China.
| | - Yunpeng Gao
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China.
| | - Jinjuan Xue
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China.
| | - Xiaoyun Liu
- Department of Microbiology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing 100191, China
| | - Huwei Liu
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China.
| | - Jianbo Wang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China.
| | - Yu Bai
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China.
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Stewart C, Gibson EK, Morgan K, Cibin G, Dent AJ, Hardacre C, Kondratenko EV, Kondratenko VA, McManus C, Rogers S, Stere CE, Chansai S, Wang YC, Haigh SJ, Wells PP, Goguet A. Unraveling the H 2 Promotional Effect on Palladium-Catalyzed CO Oxidation Using a Combination of Temporally and Spatially Resolved Investigations. ACS Catal 2018; 8:8255-8262. [PMID: 30221029 PMCID: PMC6135604 DOI: 10.1021/acscatal.8b01509] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Revised: 06/14/2018] [Indexed: 12/02/2022]
Abstract
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The promotional effect
of H2 on the oxidation of CO
is of topical interest, and there is debate over whether this promotion
is due to either thermal or chemical effects. As yet there is no definitive
consensus in the literature. Combining spatially resolved mass spectrometry
and X-ray absorption spectroscopy (XAS), we observe a specific environment
of the active catalyst during CO oxidation, having the same specific
local coordination of the Pd in both the absence and presence of H2. In combination with Temporal Analysis of Products (TAP),
performed under isothermal conditions, a mechanistic insight into
the promotional effect of H2 was found, providing clear
evidence of nonthermal effects in the hydrogen-promoted oxidation
of carbon monoxide. We have identified that H2 promotes
the Langmuir–Hinshelwood mechanism, and we propose this is
linked to the increased interaction of O with the Pd surface in the
presence of H2. This combination of spatially resolved
MS and XAS and TAP studies has provided previously unobserved insights
into the nature of this promotional effect.
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Affiliation(s)
- Caomhán Stewart
- School of Chemistry and Chemical Engineering, Queen’s University Belfast, Stranmillis Road, Belfast BT9 5AG, U.K
| | - Emma K. Gibson
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, U.K
- UK Catalysis Hub, Research Complex at Harwell, Didcot, Oxfordshire OX11 0FA, U.K
| | - Kevin Morgan
- School of Chemistry and Chemical Engineering, Queen’s University Belfast, Stranmillis Road, Belfast BT9 5AG, U.K
| | - Giannantonio Cibin
- Diamond Light Source Ltd, Harwell Science & Innovation Campus, Didcot, Oxfordshire OX11 0DE, U.K
| | - Andrew J. Dent
- Diamond Light Source Ltd, Harwell Science & Innovation Campus, Didcot, Oxfordshire OX11 0DE, U.K
| | - Christopher Hardacre
- School of Chemical Engineering and Analytical Science, University of Manchester, Manchester M13 9PL, U.K
| | - Evgenii V. Kondratenko
- Leibniz-Institut für Katalyse e.V, Universität Rostock, Albert-Einstein-Straße 29a, Rostock D-18059, Germany
| | - Vita A. Kondratenko
- Leibniz-Institut für Katalyse e.V, Universität Rostock, Albert-Einstein-Straße 29a, Rostock D-18059, Germany
| | - Colin McManus
- School of Chemistry and Chemical Engineering, Queen’s University Belfast, Stranmillis Road, Belfast BT9 5AG, U.K
| | - Scott Rogers
- UK Catalysis Hub, Research Complex at Harwell, Didcot, Oxfordshire OX11 0FA, U.K
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - Cristina E. Stere
- School of Chemical Engineering and Analytical Science, University of Manchester, Manchester M13 9PL, U.K
| | - Sarayute Chansai
- School of Chemical Engineering and Analytical Science, University of Manchester, Manchester M13 9PL, U.K
| | - Yi-Chi Wang
- School of Materials, University of Manchester, Manchester M13 9PL, U.K
| | - Sarah J. Haigh
- School of Materials, University of Manchester, Manchester M13 9PL, U.K
| | - Peter P. Wells
- UK Catalysis Hub, Research Complex at Harwell, Didcot, Oxfordshire OX11 0FA, U.K
- Diamond Light Source Ltd, Harwell Science & Innovation Campus, Didcot, Oxfordshire OX11 0DE, U.K
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, U.K
| | - Alexandre Goguet
- School of Chemistry and Chemical Engineering, Queen’s University Belfast, Stranmillis Road, Belfast BT9 5AG, U.K
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Morgan K, Maguire N, Fushimi R, Gleaves JT, Goguet A, Harold MP, Kondratenko EV, Menon U, Schuurman Y, Yablonsky GS. Forty years of temporal analysis of products. Catal Sci Technol 2017. [DOI: 10.1039/c7cy00678k] [Citation(s) in RCA: 89] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A detailed understanding of reaction mechanisms and kinetics is required in order to develop and optimize catalysts and catalytic processes. Temporal analysis of products (TAP) is an instrument capable of providing such understanding.
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Affiliation(s)
- K. Morgan
- School of Chemistry and Chemical Engineering
- Queen's University Belfast
- Belfast BT9 5AG
- UK
| | - N. Maguire
- School of Chemistry and Chemical Engineering
- Queen's University Belfast
- Belfast BT9 5AG
- UK
| | | | - J. T. Gleaves
- Department of Energy, Environmental and Chemical Engineering
- Washington University
- St Louis
- USA
| | - A. Goguet
- School of Chemistry and Chemical Engineering
- Queen's University Belfast
- Belfast BT9 5AG
- UK
| | - M. P. Harold
- Department of Chemical and Biomolecular Engineering
- University of Houston
- Houston
- USA
| | - E. V. Kondratenko
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- Rostock
- Germany
| | - U. Menon
- Department of Chemical and Biomolecular Engineering
- University of Houston
- Houston
- USA
| | - Y. Schuurman
- IRCELYON
- Université Claude Bernard Lyon 1
- Villeurbanne Cédex
- France
| | - G. S. Yablonsky
- Parks College of Engineering, Aviation and Technology
- Saint Louis University
- Saint Louis
- USA
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6
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Affiliation(s)
- Feng Xian
- Department
of Chemistry and
Biochemistry, Florida State University,
95 Chieftain Way, Tallahassee, Florida 32310-4390, United States
| | - Christopher L. Hendrickson
- Department
of Chemistry and
Biochemistry, Florida State University,
95 Chieftain Way, Tallahassee, Florida 32310-4390, United States
- Ion Cyclotron Resonance Program, National High Magnetic Field Laboratory, 1800
East Paul Dirac Drive, Tallahassee, Florida 32310-4005, United States
| | - Alan G. Marshall
- Department
of Chemistry and
Biochemistry, Florida State University,
95 Chieftain Way, Tallahassee, Florida 32310-4390, United States
- Ion Cyclotron Resonance Program, National High Magnetic Field Laboratory, 1800
East Paul Dirac Drive, Tallahassee, Florida 32310-4005, United States
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