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  Addressing electronic effects in the semi-hydrogenation of ethyne by InPd2 and intermetallic Ga-Pd compounds

Luo, Y., Alarcón Villaseca, S., Friedrich, M., Teschner, D., Knop-Gericke, A., & Armbrüster, M. (2016). Addressing electronic effects in the semi-hydrogenation of ethyne by InPd2 and intermetallic Ga-Pd compounds. Journal of Catalysis, 338, 265-272. doi:10.1016/j.jcat.2016.03.025.

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20160304_InPd2 revised.pdf (Any fulltext), 760KB
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20160304_InPd2 revised.pdf
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2016
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Luo, Yuan1, Author
Alarcón Villaseca, Sebastián1, Author
Friedrich, Matthias2, Author              
Teschner, Detre2, Author              
Knop-Gericke, Axel2, Author              
Armbrüster, Marc3, Author
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
2Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
3Faculty of Natural Sciences, Institute of Chemistry, Materials for Innovative Energy Concepts, Technische Universität Chemnitz, 09107 Chemnitz, Germany, ou_persistent22              

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 Abstract: The intermetallic compound InPd2 was prepared as single-phase material and used in an unsupported state as catalyst in the semi-hydrogenation of ethyne in a large excess of ethene. InPd2 showed high activity and selectivity (up to 93%) toward ethene in the temperature range from 478 to 508 K. In addition, the compound revealed high stability during 20 h time on stream at 473 K at 80% selectivity and >90% conversion. Investigations by differential thermal analysis combined with thermogravimetry (DTA/TG) in H2 and near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) exclude the formation of intermetallic hydrides, phase transitions, decomposition, and the presence of elemental palladium. The stability of InPd2 under reaction conditions allows addressing the influence of electronic factors on the catalytic properties by comparison with Ga–Pd intermetallic compounds. From the joint results of experiments and first-principles calculations, the electronic influence on the catalytic selectivity is found to be minor; selectivity seems to be largely governed by geometric effects – as suggested earlier by the site-isolation concept – as well as the absence of hydridic hydrogen.

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 Dates: 2016-03-162016-01-292016-03-182016-03-312016-06
 Publication Status: Published in print
 Pages: 8
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.jcat.2016.03.025
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Title: Journal of Catalysis
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: 8 Volume / Issue: 338 Sequence Number: - Start / End Page: 265 - 272 Identifier: ISSN: 0021-9517
CoNE: https://pure.mpg.de/cone/journals/resource/954922645027