Optimization of transition metal nanoparticle-phosphonium ionic liquid composite catalytic systems for deep hydrogenation and hydrodeoxygenation reactions
作者： Abhinandan Banerjee , Robert W. J. Scott
DOI: 10.1039/C4GC01716A
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摘要: A variety of metal nanoparticle (NP)/tetraalkylphosphonium ionic liquid (IL) composite systems were evaluated as potential catalysts for the deep hydrogenation aromatic molecules. Particles synthesized by reducing appropriate salts LiBH4 in a ILs. Gold NPs used probes to investigate effect both chain lengths alkyl substituents on phosphonium cation and nature anions, stability dispersed The presence three medium-to-long chains (such hexyl) along with one long tetradecyl) IL, coupled highly coordinating anions halides, or smaller extent, bis-triflimides) produced most stable dispersions. These ILs also showed maximum resistance heat-induced sintering; example, TEM studies Pt heated under hydrogen 120 °C only moderate sintering trihexyl(tetradecyl)phosphonium chloride bis(triflimide) Finally, olefinic hydrogenations, hydrodeoxygenation phenol carried out Ru, Pt, Rh PtRh using at elevated pressures. From preliminary studies, Ru emerged catalyst system choice. borate Lewis-acid by-products reaction medium (from borohydride reduction step) allowed partial hydrodeoxygenation.
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