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Li-doped MgO From Different Preparative Routes for the Oxidative Coupling of Methane

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Abstract

Li-doped MgO was prepared on different preparative routes and with different loadings. The catalytic activity was found to decay for all catalysts for 40 h time on stream. A detailed structural analysis of 0.5 wt% Li-doped MgO showed heavy losses of Li, reduced surface area and grain growth. A correlation between these factors and the deactivation could not be found. The reaction temperature and the flow rate were found to be the main deactivation parameters.

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Abbreviations

AAS:

Atomic absorption spectroscopy

BET:

Brunauer Emmett Teller

ENDOR:

Electron nuclear double resonance spectroscopy

EPR:

Electron paramagnetic resonance

ESR:

Electron spin resonance

eV:

Electron volt

FID:

Flame ionisation detector

FWHH:

Full width at half height

MAS:

Magic angle spinning

NMR:

Nuclear magnetic resonance spectroscopy

OCM:

Oxidative coupling of methane

PFTR:

Plug flow tubular reactor

S:

Selectivity

SEM:

Scanning electron microscopy

TCD:

Thermal conductivity detector

TEM:

Transmission electron microscopy

TPPM:

Two pulse phase modulation

X:

Conversion

XRD:

X-ray diffraction

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Acknowledgements

We would like to thank the Deutsche Forschungsgemeinschaft for funding the Excellence Cluster “Unicat” (Unifying Concepts in Catalysis) and the IMPRS (International Max Planck Research School) of the Fritz Haber Institute of the Max Planck Society for financial support. We are also obliged to Mr. Axel Schiele and the workshop for their support with the equipment. We thank Dr. Traugott Scheytt and his team for the performance of the AAS analysis and Dr. Nakhal for the H2S pretreatment of the Li/MgO catalyst. We are indepted to Dr. Thomas Risse and Dr. Raimund Horn for their valuable advice. We also thank our apprentices Mrs. Anna Paliszewska and Mr. Domenic Jelinski, for their support with the sample preparation and analysation. We would like to thank Prof. Dr. Arne Thomas for the permission to use his multi-sampling XRD machine and Dr. Kamalakannan Kailasam for the XRD experiments. We thank the Helmholtz Center, Berlin for the permission to use their electron microscope. We thank also the ZELMI (Zentrales Laboratorium für Elektronenmikroskopie, TU, Berlin) for TEM analyses.

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Authors and Affiliations

  1. Institut für Chemie, Technische Universität Berlin, Straße des 17.Juni 124, 10623, Berlin, Germany

    S. Arndt, S. Heitz, B. Beck, J. -D. Epping, T. Otremba, Y. Aksu, E. Irran, G. Laugel, M. Driess & R. Schomäcker

  2. Institut für Werkstoffwissenschaften, Technische Universität Berlin, Straße des 17.Juni 124, 10623, Berlin, Germany

    U. Simon, A. Berthold, O. Görke & H. Schubert

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  1. S. Arndt
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  2. U. Simon
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Correspondence to R. Schomäcker.

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Arndt, S., Simon, U., Heitz, S. et al. Li-doped MgO From Different Preparative Routes for the Oxidative Coupling of Methane. Top Catal 54, 1266 (2011). https://doi.org/10.1007/s11244-011-9749-z

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