The influence of reaction conditions on selective acetylene hydrogenation over sol immobilisation prepared AgPd/Al2O3 catalysts

Hutchings, Graham John ORCID: https://orcid.org/0000-0001-8885-1560, Williams, Jake, Kitching, Ella, Patel, Rhea-Shree, Mauss, Jonathan, Kley, Klara, Khobragade, Rohini, de Bellis, Jacopo, Morgan, David ORCID: https://orcid.org/0000-0002-6571-5731, Slater, Thomas ORCID: https://orcid.org/0000-0003-0372-1551, Schueth, Ferdi, Taylor, Stuart ORCID: https://orcid.org/0000-0002-1933-4874, Dummer, Nicholas ORCID: https://orcid.org/0000-0002-0946-6304 and Bender, Michael 2025. The influence of reaction conditions on selective acetylene hydrogenation over sol immobilisation prepared AgPd/Al2O3 catalysts. ChemCatChem 10.1002/cctc.202401794

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Abstract

Electric plasma activation of methane opens up the possibility to produce ethene, an important platform chemical in industry, by using sustainable resources like biogas or hydrogenated carbon dioxide and electricity from renewable energies. The ethene stream of such pyrolysis plants contains, however, much higher concentrations of acetylene (≥ 15 vol.%) compared to ethene from conventional steam cracking of naphtha (< 2 vol.%). In this study, silver‐palladium catalysts in various compositions supported on alumina were synthesized via a sol‐immobilisation technique and investigated in the selective gas‐phase hydrogenation of equally concentrated acetylene‐ethene mixtures under industrially relevant pressures. A molar Pd concentration of around 10 % in the PdAg alloyed nanoparticles was identified as the optimum composition for simultaneous high activity and ethene selectivity under catalysis conditions. Higher temperatures seem to be crucial for the stability of the catalysts on‐stream most likely via increased desorption of active site blocking and high‐boiling oligomers from acetylene. The best performing Pd10Ag90 displayed an ethene, ethane and C4+ selectivity of 65, 4 and 14% respectively, at 175 °C while being active for more than 200 minutes. The performance of the catalyst was compared with catalysts synthesized via a mechanochemical and a conventional wet‐impregnation procedure.

Item Type:	Article
Date Type:	Published Online
Status:	In Press
Schools:	Schools > Chemistry Research Institutes & Centres > Cardiff Catalysis Institute (CCI)
Publisher:	Wiley
ISSN:	1867-3880
Date of First Compliant Deposit:	21 March 2025
Date of Acceptance:	3 March 2025
Last Modified:	02 Apr 2025 13:25
URI:	https://orca.cardiff.ac.uk/id/eprint/177070

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