02064nas a2200265   4500008004100000022001400041245011200055210006900167260000800236300001400244490000700258520120900265653000601474653001701480653001701497653002101514653001301535653001301548653002701561100001801588700002001606700001901626700002501645856012801670       2021                        eng d  a0268-257500aBioglycerol (C3) upgrading to 2,3-butanediol (C4) by cell-free extracts of Enterobacter aerogenes NCIM 26950 aBioglycerol C3 upgrading to 23butanediol C4 by cellfree extracts  cMAY  a1316-13250 v963 a<p>BACKGROUND Production of biobased chemicals from renewable resources is a green starring approach that serves as a substitute to petroleum derivatives. Bioglycerol, with its growing production as a co-product of biodiesel, is an attractive low-cost feedstock for the synthesis of platform chemicals by microbial fermentation. 2,3-butanediol (2,3-BDO) is amongst the top biorefinery platform chemicals that can be produced by glycerol fermentation. RESULTS The `Circular Economy' concept is demonstrated by converting the by-product bioglycerol using a cell-free extract of Enterobacter aerogenes NCIM 2695 (National Collection of Industrial Microorganisms, NCIM), yielding 22 g L-1 2,3-BDO, in 96 h, 98% atom economy and 0.4 g/g E factor. The cell-free bioglycerol conversion to 2,3-BDO was proved using a modified procedure for determining glycerol dehydrogenase enzyme assay by protein analysis and it was also shown to be cell-bounded. CONCLUSION Our study offers an effective utilization of the leftover material (i.e. cell-free extract) that biocatalysed C3 to C4 diol, which adds value to the overall economics of the process using only crude glycerol (C3) itself as a fermentative medium.</p>
10a210a3-Butanediol10aatom economy10acircular economy10aE factor10aGlycerol10aglycerol dehydrogenase1 aParate, Roopa1 aBorgave, Mrunal1 aDharne, Mahesh1 aRode, Chandrashekhar  uhttps://library.ncl.res.in/content/bioglycerol-c3-upgrading-23-butanediol-c4-cell-free-extracts-enterobacter-aerogenes-ncim02135nas a2200253   4500008004100000022001400041245011400055210006900169260000800238300001100246490000700257520127700264653002601541653001301567653002301580653002101603100002301624700001801647700002101665700001601686700002401702700002501726856013001751       2021                        eng d  a0019-452200aRole of preparation parameters of Cu-Zn mixed oxide catalyst in solvent free glycerol carbonylation with urea0 aRole of preparation parameters of CuZn mixed oxide catalyst in s  cJUL  a1000900 v983 aSolvent-free carbonylation of glycerol with urea to glycerol carbonate (GC) was achieved over heterogeneous Cu-Zn mixed oxide catalyst. Cu-Zn catalysts with different ratios of Cu:Zn were prepared using co-precipitation (CP) and oxalate gel (OG) methods. As compared to CuO-ZnO(2:1) catalyst prepared by oxalate gel (OG) method, much higher conversion of glycerol and highest selectivity towards glycerol carbonate (GC) was achieved with CuO-ZnO_CP(2:1) catalyst. Physicochemical properties of prepared catalysts were investigated by using XRD, FT-IR, BET, TPD of CO2 and NH3 and TEM techniques. The effect of stoichiometric ratio of Cu/Zn, calcination temperature of CuO-ZnO catalysts and effect of reaction parameters such as molar ratio of substrates, time and temperature on glycerol conversion to GC were critically studied. Cu/Zn of 2:1 ratio, glycerol-urea 1:1 molar ratio, 145 degrees C reaction temperatures were found to be optimized reaction conditions to achieve highest glycerol conversion of 86% and complete selectivity towards GC. The continuous expel of NH 3 from reaction the mixture avoided formation of ammonia complex with CuO-ZnO catalyst. As a result of this, CuO-ZnO catalyst could be recycled up to three times without losing its initial activity.10aCo-precipitation (CP)10aGlycerol10aGlycerol carbonate10aOxalate gel (OG)1 aCharate, Shrinivas1 aShinde, Suhas1 aKondawar, Sharda1 aDesai, Uday1 aWadgaonkar, Prakash1 aRode, Chandrashekhar  uhttps://library.ncl.res.in/content/role-preparation-parameters-cu-zn-mixed-oxide-catalyst-solvent-free-glycerol-carbonylation01770nas a2200241   4500008004100000022001400041245010500055210006900160260000800229300001500237490000700252520097900259653000801238653003001246653001301276653001701289653002601306653001101332100001801343700001701361700002501378856012501403       2022                        eng d  a2193-580700aInfluence of catalyst reduction temperature on autogenous glycerol hydrogenolysis over NiAl catalyst0 aInfluence of catalyst reduction temperature on autogenous glycer  cFEB  ae2021007040 v113 a<p>
	Autogenous glycerol hydrogenolysis to 1,2-propanediol by aqueous phase reforming (APR) was investigated over supported nickel catalysts. Effect of reduction temperature on physico-chemical properties of catalysts played a significant role in tuning conversion and product selectivities. The formation of nickel aluminate (NiAl2O4) spinel phase during catalyst reduction led to rearrangement of Ni species to obtain small and stable Ni particles. The catalyst activation temperature alters the extent of reduction of multivalent Ni species (Ni-0, Ni+2/+3) which facilitated glycerol dehydration and hydrogenation while suppressing C-C cleavage and thus avoiding undesirable side products. Additionally, presence of moderate Bronsted/Lewis acid ratio of the catalyst promoted higher 1,2-PDO selectivity. In-situ glycerol hydrogenolysis involves glycerol dehydration to acetol with simultaneous reforming to H-2 and CO2 and this hydrogen converts acetol to 1,2-PDO.</p>
10aAPR10aautogenous hydrogenolysis10aGlycerol10aPropanediols10areduction temperature10aspinel1 aPandya, Rajan1 aMane, Rasika1 aRode, Chandrashekhar  uhttps://library.ncl.res.in/content/influence-catalyst-reduction-temperature-autogenous-glycerol-hydrogenolysis-over-nial