Breaking the inverse relationship between catalytic activity and selectivity in acetylene partial hydrogenation using dynamic metal-polymer interaction

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The partial hydrogenation of acetylene impurities in ethylene is industrially important because acetylene acts as a catalyst poison in downstream ethylene polymerization processes. In this reaction, simultaneously achieving high acetylene conversion and partial hydrogenation selectivity is challenging, and most known catalyst systems exhibit an inverse activity-selectivity relationship. Here, an amorphous polyphenylene sulfide (Am-PPS) was synthesized as a promoter for 0.1 wt% Pd/alpha-Al2O3. The catalyst modification using a trace amount of Am-PPS (0.15 wt%) enabled a remarkable enhancement of ethylene selectivity without an appreciable loss in acetylene hydrogenation activity. This could be attributed to the dynamic change of the Am-PPS-Pd interface, which selectively allows the cooperative adsorption of acetylene and H-2, but not ethylene. Besides, the modified catalyst exhibited excellent long-term stability because of the high thermochemical stability of the polymer. These results demonstrate the unique possibility of using dynamic metal-polymer interaction to design partial hydrogenation catalysts that simultaneously exhibit high activity, selectivity, and stability. (C) 2021 Elsevier Inc. All rights reserved.
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Issue Date
2021-12
Language
English
Article Type
Article
Citation

JOURNAL OF CATALYSIS, v.404, pp.716 - 725

ISSN
0021-9517
DOI
10.1016/j.jcat.2021.09.017
URI
http://hdl.handle.net/10203/292351
Appears in Collection
CH-Journal Papers(저널논문)CBE-Journal Papers(저널논문)
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