The most selective Pd-Zn surfaces for the selective hydrogenation of acetylene to ethylene were recently proposed to be intermetallic in nature, exhibiting only Pd-Zn-Pd units and no Pd-Pd pairs, the later forming bridged CO upon exposure to CO. Ceria-supported Pd-Zn formulations apparently free of Pd-Pd ensembles were prepared and yet led to poor selectivity to ethylene. CO methanation was actually shown to be a better selectivity descriptor in the present case. Only the samples most selective for acetylene semi‑hydrogenation, which were obtained by reduction at temperatures equal or higher than 550 °C, led to negligible CO methanation rates. © 2017 Elsevier B.V.

Acetylene semi-hydrogenation over Pd-Zn/CeO2: Relevance of CO adsorption and methanation as descriptors of selectivity

Colussi, Sara;Trovarelli, Alessandro
2018

Abstract

The most selective Pd-Zn surfaces for the selective hydrogenation of acetylene to ethylene were recently proposed to be intermetallic in nature, exhibiting only Pd-Zn-Pd units and no Pd-Pd pairs, the later forming bridged CO upon exposure to CO. Ceria-supported Pd-Zn formulations apparently free of Pd-Pd ensembles were prepared and yet led to poor selectivity to ethylene. CO methanation was actually shown to be a better selectivity descriptor in the present case. Only the samples most selective for acetylene semi‑hydrogenation, which were obtained by reduction at temperatures equal or higher than 550 °C, led to negligible CO methanation rates. © 2017 Elsevier B.V.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11390/1126094
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