01783nas a2200265 4500008004100000022001400041245008000055210006900135260000800204300001000212490000800222520100100230653000601231653000601237653001701243653001801260653001801278653001601296653001801312100001801330700001701348700001901365700002501384856010801409 2018 eng d a0960-852400aMixed bacterial culture mediated direct conversion of bio-glycerol to diols0 aMixed bacterial culture mediated direct conversion of bioglycero cFEB a86-930 v2503 a

Direct and economic transformation of biodiesel derived crude glycerol is gaining more significance. During screening of bacterial cultures Klebsiella pneumoniae and Enterobacter aerogenes were able to convert crude bio-glycerol to 2,3-butanediol (2,3-BDO) and 1,3-propanediol (1,3-PDO), as major compounds, ethanol and acetoin as minor compounds, with a conversion of 69% and 79% respectively. Process optimization could achieve maximum conversion at pH 7.0, 37 degrees C, 30-40 g/L glycerol and 1.5 g of inoculum until 120 h. Mixed cultures led to complete glycerol conversion with optimal yield and productivity. An innovative approach of using crude glycerol for sustained growth and tolerance of bacteria as source of carbon and energy makes this study more significant. In addition to this, a mixed culture concept introduced here is expected to make impact in process economics for industrial scale synthesis for direct transformation of glycerol into C3 and specifically, C4 diols.

10a110a210a3-Butanediol10a3-Propanediol10aBioconversion10aBioglycerol10aMixed culture1 aParate, Roopa1 aMane, Rasika1 aDharne, Mahesh1 aRode, Chandrashekhar uhttp://library.ncl.res.in/content/mixed-bacterial-culture-mediated-direct-conversion-bio-glycerol-diols02080nas a2200205 4500008004100000022001400041245009200055210006900147260000800216520137100224653000601595653001801601653004401619653002501663653001301688653001901701100002101720700002101741856011201762 2021 eng d a0161-494000aAdvances in solid catalysts for selective hydrogenolysis of glycerol to 1,3-propanediol0 aAdvances in solid catalysts for selective hydrogenolysis of glyc cJAN3 a

Glycerol is one of the top 12 platform chemicals obtained from biomass. Its surplus availability as a by-product of biodiesel, fat-splitting and soap manufacturing industries and affordable price lends significant opportunity for its valorization, using solid catalysts, into propanediols (PDOs), particularly to 1,3-propanediol (1,3-PDO), by selective hydrogenolysis. 1,3-PDO is an important chemical with wide applications including that as a precursor in polymers manufacturing. However, the synthesis of 1,3-PDO by selective cleavage of the secondary C-O bond of glycerol in the presence of hydrogen (instead of the primary C-O bond yielding 1,2-PDO) is highly challenging. Of late, supported Pt and Ir catalysts in combination with a reducible oxide (WO(x)or ReOx) were found selective for 1,3-PDO formation. Support, metals composition and additives (co-added metals) affect the performance of these catalysts. Detailed investigations revealed that metal dispersion, electronic connectivity between metal and metal oxide/support, hydrogen activation/spillover and Bronsted acidity are some parameters that influence the activity and selectivity of these bi-functional, metal-metal oxide catalysts. This review summarizes the latest advances in these solid catalysts for selective hydrogenolysis of glycerol to 1,3-PDO, a monomer for advanced polymers.

10a110a3-Propanediol10abifunctional metal-metal oxide catalyst10abiomass valorization10aGlycerol10aHydrogenolysis1 aBhowmik, Susmita1 aDarbha, Srinivas uhttp://library.ncl.res.in/content/advances-solid-catalysts-selective-hydrogenolysis-glycerol-13-propanediol02073nas a2200277 4500008004100000022001400041245013100055210006900186260000800255300001100263490000800274520114500282653001801427653001701445653001301462653002301475653001901498653002201517100002101539700002501560700001901585700002101604700002001625700002101645856012901666 2022 eng d a2468-823100aInsights into active tungsten species on Pt/W/SBA-15 catalysts for selective hydrodeoxygenation of glycerol to 1,3-propanediol0 aInsights into active tungsten species on PtWSBA15 catalysts for  cOCT a1127040 v5313 a

Diols are important class of industrial chemicals. Their synthesis from bio-resources (instead from fossil feed-stocks) is sustainable. In this study, we probed active tungsten species on Pt/W/SBA-15 catalysts for selective synthesis of 1,3-propanediol (1,3-PDO) from aqueous glycerol through a liquid-phase hydrodeoxygenation re-action. A synergistic enhancement in glycerol conversion and 1,3-PDO selectivity was observed when both Pt and W were present on the catalyst. A volcano-shape variation followed with a gradual increase in glycerol conversion and 1,3-PDO yield with W-loading (0.25-15 wt%) was observed. Pt dispersion and acidity of the catalyst dis-played similar variations with the W-loading confirming their critical role in the reaction. Structure-function relationships inferred that oligomeric WOx with moderate Bro center dot nsted acidity (predominant at 1 wt% W-loading) in contact with dispersed Pt are the active species for 1,3-PDO formation and crystalline WO3 with strong Bro center dot nsted acidity (prevalent above 4 wt% W-loading) in association with Pt nanoparticles lead to 1-propanol formation.

10a3-Propanediol10aActive sites10aGlycerol10aHydrodeoxygenation10aHydrogenolysis10aSupported Pt-WO x1 aBhowmik, Susmita1 aEnjamuri, Nagasuresh1 aSethia, Govind1 aAkula, Venugopal1 aMarimuthu, Banu1 aDarbha, Srinivas uhttp://library.ncl.res.in/content/insights-active-tungsten-species-ptwsba-15-catalysts-selective-hydrodeoxygenation-glycerol