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Palladium‐Mediated Ethylation of the Imidazolium Cation Monitored In Operando on a Solid Catalyst with Ionic Liquid Layer
Author(s) -
Bauer Tanja,
Hager Veit,
Williams Marc B.,
Laurin Mathias,
Döpper Tibor,
Görling Andreas,
Szesni Normen,
Wasserscheid Peter,
Haumann Marco,
Libuda Jörg
Publication year - 2017
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201601222
Subject(s) - ionic liquid , palladium , catalysis , chemistry , moiety , yield (engineering) , infrared spectroscopy , inorganic chemistry , heterogeneous catalysis , reaction mechanism , diffuse reflection , fourier transform infrared spectroscopy , photochemistry , organic chemistry , materials science , chemical engineering , metallurgy , physics , optics , engineering
The ionic liquid 1‐ethyl‐3‐methylimidazolium ethylsulfate [EMIM][EtOSO 3 ] was supported on Pd‐Al 2 O 3 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.