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Catalysis in Green Chemistry and Engineering

ISSN Druckformat: 2572-9896
ISSN Online: 2572-990X

Catalysis in Green Chemistry and Engineering

DOI: 10.1615/.2018025140
pages 155-165

EFFECT OF ANION VARIATION OF IMIDAZOLIUM-BASED IONIC LIQUIDS ON HYDROGENATION OF LEVULINIC ACID TO γ-VALEROLACTONE AND PENTANOIC ACID OVER RU/C CATALYST

Virendra Patil
Chemical Engineering and Process Development Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India; Applied Thermal Engineering – CREVER Department of Mechanical Engineering, Universitat Rovira i Virgilli. Av. PaÃrsos Catalans 26, 43007, Tarragona, Spain
Suhas Shinde
Chemical Engineering and Process Development Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
Alberto Coronas
Applied Thermal Engineering – CREVER Department of Mechanical Engineering, Universitat Rovira i Virgilli. Av. PaÃrsos Catalans 26, 43007, Tarragona, Spain
Kashinath Patil
Centre for Material Characterisation, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
Chandrashekhar Rode
Chemical Engineering and Process Development Division, CSIR-National Chemical Laboratory, Pune 411008, India

ABSTRAKT

A new, efficient, and reusable combination of imidazolium-based Brønsted acidic ionic liquids (ILs) as a co-catalyst with 5% Ru/C was employed for selective aqueous phase hydrogenation of levulinic acid (LA). Activity and selectivity performance in the hydrogenation of levulinic acid were found to be a function of acidities of ionic liquids. A combination of 5% Ru/C and strong acidic IL ([Hmim][HSO4]) showed 100% LA conversion with 99% selectivity to gammavalerolactone (GVL). Although a combination of 5% Ru/C and relatively weak acidic IL ([Hmim][HCOO]) has shown 56% selectivity to pentanoic acid with 80% conversion of LA. IL and Ru/C, both are easily separable bymeans of simple filtration and can be reused up to several cycles with consistent results. Brønsted acidities of ionic liquids were measured by the Hammet acidity function and UV-visible spectroscopy, and 5% Ru/C catalyst was characterized by X-ray diffraction, high-resolution transmission electron microscopy, and energy dispersive X-ray spectroscopy techniques. The effect of concentrations of ionic liquid and catalyst on LA conversion and GVL selectivity was also studied.

SCHLÜSSELWÖRTER: hydrogenation, ionic liquid, GVL, Ru/C, fuel

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