Palladium‐Mediated Ethylation of the Imidazolium Cation Monitored In Operando on a Solid Catalyst with Ionic Liquid Layer. Issue 1 (7th December 2016)

• Record Type: Journal Article
• Authors: Bauer, Tanja; Hager, Veit; Williams, Marc B.; Laurin, Mathias; Döpper, Tibor; Görling, Andreas; Szesni, Normen; Wasserscheid, Peter; Haumann, Marco; Libuda, Jörg
• Is Part Of: ChemCatChem. Volume 9:Issue 1(2017)
• Page Start: 109
• Page End: 113
• Publication Date: 2016-12-07
• Subjects: carbenes -- heterogeneous catalysis -- ionic liquids -- palladium -- reaction mechanisms; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.201601222
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: The ionic liquid 1‐ethyl‐3‐methylimidazolium ethylsulfate [EMIM][EtOSO3 ] was supported on Pd‐Al2 O3 to yield a solid catalyst with ionic liquid layer (SCILL) material. During the hydrogenation of ethene, it was found that ethene was incorporated into the imidazolium moiety in a reaction catalyzed by the palladium surface. The formation of 1, 2‐diethyl‐3‐methylimidazolium ethylsulfate was confirmed ex situ by means of NMR spectroscopy. Moreover, the reaction itself could be monitored in situ by diffuse reflection infrared Fourier transformation (DRIFT) spectroscopy. A reaction mechanism involving surface carbene species was proposed on the basis of the analytical data. Abstract : Surface reaction : The ionic liquid 1‐ethyl‐3‐methylimidazolium ethylsulfate is supported on Pd‐Al2 O3 to yield a solid catalyst with an ionic liquid layer. During the hydrogenation of ethene, ethene is incorporated into the imidazolium moiety in a reaction catalyzed by the palladium surface. On the basis of in situ diffuse reflection infrared Fourier transformation spectroscopy, a reaction mechanism involving surface carbene species is proposed.