Abstract
Palladium nanoparticles (ca. 4.8 nm) were synthesized in presence of 1-n-butyl-3-methylimidazolium tetraflouroborate (BMI.BF4) and 1-n-butyl-3-methylimidazolium hexafluorophosphate (BMI.PF6) and PMI.Si.(OMe)3.Cl functionalized ionic liquids using the sol-gel method. The characteristics of the sol-gel method, ionic liquid on the palladium content was studied, as well as the silica morphology and texture of the support and the hydrogenation activity. The palladium content in the resulting xerogels (ca. 0.22 wt% Pd/SiO2) was shown to be independent of the sol-gel process. The xerogels synthesized in acidic conditions formed materials with larger pore diameters, which in turn might be responsible for the higher catalytic activity in hydrogenation of the alkenes and arenes obtained with the heterogeneous catalyst (Pd/ILs/SiO2).
Highlights
Palladium catalysts supported are used in various processes including amination, Heck and Suzuki coupling, hydrogenation, hydrogen production and dehydrogenation reactions [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]
We present our results, which show that palladium nanoparticles synthesized in BMI.BF4, BMI.PF6 and PMI.Si.(OMe)3.Cl ionic liquids can be applied for the generation of the heterogeneous catalyst (Pd/Ionic Liquids (ILs)/SiO2) via sol-gel processes
The hydrolysis and condensation of Tetraethoxy Orthosilicate (TEOS) were performed in the presence of Pd NPs, which were prepared by hydrogen reduction (4 atm) of Pd2(dba)3 dissolved in the ionic liquids at 75°C [27]
Summary
Palladium catalysts supported are used in various processes including amination, Heck and Suzuki coupling, hydrogenation, hydrogen production and dehydrogenation reactions [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]. The characteristics of the sol-gel method, ionic liquid on the palladium content was studied, as well as the silica morphology and texture of the support and the hydrogenation activity. The xerogels synthesized in acidic conditions formed materials with larger pore diameters, which in turn might be responsible for the higher catalytic activity in hydrogenation of the alkenes and arenes obtained with the heterogeneous catalyst (Pd/ILs/SiO2).
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