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

Luo, Y., Alarcon 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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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-F80E-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-A028-C
Genre: Journal Article

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 Creators:
Luo, Yuan1, Author              
Alarcon Villaseca, Sebastián1, Author              
Friedrich, Matthias2, Author
Teschner, Detre2, Author
Knop-Gericke, Axel2, Author
Armbrüster, Marc2, Author
Affiliations:
1Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
2External Organizations, 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 H-2 and near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) exclude the formation of inter metallic 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. (C) 2016 Elsevier Inc. All rights reserved.

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Language(s): eng - English
 Dates: 2016-06-042016-06-04
 Publication Status: Published in print
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Title: Journal of Catalysis
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 338 Sequence Number: - Start / End Page: 265 - 272 Identifier: ISSN: 0021-9517
CoNE: /journals/resource/954922645027