01819nas a2200145   4500008004100000245010500041210006900146260000800215300001400223490000600237520125400243100002201497700002201519856013201541       2018                        eng d00aNovel synthesis of immobilized bronsted- acidic ionic liquid: application in lignin depolymerization0 aNovel synthesis of immobilized bronsted acidic ionic liquid appl  cMAY  a5461-54700 v33 aDesigning of efficient catalyst for the valorization of lignin is a topic of long neglect due to intrinsic properties of lignin. We show designing of an efficient, stable and recyclable Immobilized-Bronsted acidic ionic liquid (I-BAIL), which was further used as a solid acid catalyst for the depolymerization of lignin. The synthesized I-BAIL catalyst with sulfonic acid (-SO3H) groups was found to be stable until 250 degrees C and has 42.2 wt.% loading of BAIL anchored on silica framework. The detailed characterization (elemental, Thermogravimetric analysis, Fourier transformation-infrared, Nuclear magnetic resonance) of catalyst disclosed formation of strong covalent bond between Si and carbon of BAIL, which in turn is responsible for achieving a stable catalyst. The catalyst could successfully depolymerize range of lignin substrates with high molecular weight (60000 Dalton) at 200(degrees)C in 1 h to achieve 90% yield of tetrahydrofuran soluble products with good mass balance. The formation of products and correlation of products with lignin was achieved with the help of Nuclear magnetic resonance, gel permeation chromatography, gas chromatography, gas chromatography-mass spectrometry, high performance liquid chromatography etc.1 aSingh, Sandip, K.1 aDhepe, Paresh, L.  uhttps://library.ncl.res.in/content/novel-synthesis-immobilized-bronsted-acidic-ionic-liquid-application-lignin-depolymerization