01494nas a2200217   4500008004100000245010600041210006900147260000800216300002600224490000600250520070700256100002800963700002600991700002001017700002201037700002301059700002101082700002201103700002101125856013001146       2017                        eng d00aDirect production of furfural in one-pot fashion from raw biomass using bronsted acidic ionic liquids0 aDirect production of furfural in onepot fashion from raw biomass  cOCT  aArticle Number: 135080 v73 aThe conversion of raw biomass into C5-sugars and furfural was demonstrated with the one-pot method using Bronsted acidic ionic liquids (BAILs) without any mineral acids or metal halides. Various BAILs were synthesized and characterized using NMR, FT-IR, TGA, and CHNS microanalysis and were used as the catalyst for raw biomass conversion. The remarkably high yield (i.e. 88%) of C5 sugars from bagasse can be obtained using 1-methyl-3(3-sulfopropyl)-imidazolium hydrogen sulfate ([C3SO3HMIM][HSO4]) BAIL catalyst in a water medium. Similarly, the [C3SO3HMIM][HSO4] BAIL also converts the bagasse into furfural with very high yield (73%) in one-pot method using a water/toluene biphasic solvent system.1 aMatsagar, Babasaheb, M.1 aHossain, Shahriar, A.1 aIslam, Tofazzal1 aAlamri, Hatem, R.1 aAlothman, Zeid, A.1 aYamauchi, Yusuke1 aDhepe, Paresh, L.1 aWu, Kevin, C. W.  uhttps://library.ncl.res.in/content/direct-production-furfural-one-pot-fashion-raw-biomass-using-bronsted-acidic-ionic-liquids01732nas a2200157   4500008004100000022001400041245005900055210005900114260000800173300001400181490000700195520124000202100002101442700002201463856008901485       2019                        eng d  a0887-062400aDepolymerization of lignin using a solid base catalyst0 aDepolymerization of lignin using a solid base catalyst  cMAY  a4369-43770 v333 a<p>Lignin extraction from lignocellulosic biomass has attracted considerable attention for an alternative production of sustainable fuels and chemicals. We report the lignin isolation from coconut coir using Klason, organosolv, and soda methods and the depolymerization of isolated lignin to value-added chemicals using a solid base catalyst. The yield of isolated lignin by the Klason method was found to be about 4 to 6 times higher than that by other methods. The structure of isolated Klason lignin (CC-KL), organosolv lignin (CC-ORGL), and soda lignin (CC-SL) was studied using attenuated total reflection (ATR), NMR, microanalysis, and so forth. The monomer molecular formula derived from microanalysis suggested that coir lignin is rich in guaiacyl units. ATR and C-13 NMR clearly indicate that CC-ORGL contains more C-C bonds compared to CC-KL and CC-SL. Subsequently, these isolated lignins were depolymerized over a solid base catalyst (NaX) under atmospheric pressure. CC-SL shows a high yield of aromatic products (28%) compared to CC-ORGL and CC-KL. In order to develop a sustainable future technology, one-pot depolymerization of coconut coir was performed which resulted in a high yield (64%) of aromatic products.</p>
1 aChaudhary, Richa1 aDhepe, Paresh, L.  uhttps://library.ncl.res.in/content/depolymerization-lignin-using-solid-base-catalyst02151nas a2200169   4500008004100000022001400041245008200055210006900137260000800206300001400214490000700228520157200235100002101807700002501828700002201853856010601875       2023                        eng d  a1144-054600aDesigning an industrially viable bimetallic catalyst for the polyol synthesis0 aDesigning an industrially viable bimetallic catalyst for the pol  cAPR  a7548-75550 v473 a<p>
	Designing new catalysts for the hydrogenation of sugars is important since the conventional catalyst RANEY (R) Ni faces issues such as leaching, operation under severe conditions (similar to 100 bar H-2) to achieve better yields and formation of complexes of Ni with polyols. To overcome these issues and to have an industrially acceptable methodology, bimetallic catalysts with varying metal loadings (Ru = 1.5 and 2 wt% and Co = 1.5, 3, and 4 wt%) were synthesized in the current work and their hydrogenation activities were evaluated for the synthesis of sugar alcohols from various sugars. It was revealed that the nature of the support plays an important role in deciding the selectivity and activity of the catalyst and amongst all the supports, basic alumina showed the best activity due to its contribution to the ring opening of sugars. C5 and C6 sugars were successfully hydrogenated to their respective sugar alcohols under low H-2 pressures (15 bar) and it was observed that as compared to the monometallic (1.5)Ru/Al-Basic catalyst, the bimetallic (1.5)Ru(3)Co/Al-Basic catalyst showed enhancement in the activity by almost 1.5 times. The improvement in the activity is suggested to be due to (i) observance of the synergistic effect between the base metal (Ru) and the promoter metal (Co); (ii) effect of basicity of the support; and (iii) electronic effect of Ru and Co. Recyclability of the catalysts and their efficiency to hydrogenate higher concentration substrate solutions (10-20 wt%) make the overall process industrially attractive.</p>
1 aKadam, Jyoti, R.1 aKhan, Tufeil, Sartaj1 aDhepe, Paresh, L.  uhttps://library.ncl.res.in/content/designing-industrially-viable-bimetallic-catalyst-polyol-synthesis