01964nas a2200217   4500008004100000022001400041245011300055210006900168260010100237300001200338490000800350520108300358653002801441653002001469653003301489653002801522653002801550100002001578700002101598856012701619       2014                        eng d  a0974-362600aSolid, double-metal cyanide catalysts for synthesis of hyperbranched polyesters and aliphatic polycarbonates0 aSolid doublemetal cyanide catalysts for synthesis of hyperbranch  aC V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIAbCatalysis Soc IndiacMAR  a499-5090 v1263 a<p>Fe-Zn and Co-Zn double-metal cyanide (DMC) complexes exhibit highly efficient and selective catalytic activity for synthesis of hyperbranched polyesters (glycerol succinic acid (G-SA) and glycerol adipic acid (G-AA)) and aliphatic polycarbonates (via., alternative co-polymerization of cyclohexene oxide and CO2), respectively. The influence of method of preparation of DMC, in particular the mode of addition of reagents, on its physicochemical and catalytic properties was investigated. Co-Zn DMC was found highly selective for polycarbonate (than polyethers) formation. Catalysts prepared using tert-butanol and PEG-4000 as complexing and co-complexing agents, respectively, were found superior to those prepared without these agents. Apart from its role as a coordinating ligand, tert-butanol activated the Lewis acidic Zn2+ sites for reactions in polyester and polycarbonate formation. Hydrophobicity, micro-mesoporosity, acid strength and the amount of coordinated complexing agent are some of the crucial factors influenced the catalytic activity of DMC complexes.</p>10aaliphatic polycarbonate10aCO2 utilization10aDouble-metal cyanide complex10aheterogeneous catalysis10ahyperbranched polyester1 aSebastian, Joby1 aDarbha, Srinivas  uhttps://library.ncl.res.in/content/solid-double-metal-cyanide-catalysts-synthesis-hyperbranched-polyesters-and-aliphatic-001906nas a2200217   4500008004100000022001400041245011100055210006900166260010200235300001200337490000800349520106200357653002401419653001001443653002001453653002301473653002801496100002101524700002101545856012201566       2016                        eng d  a0974-362600aDirect synthesis of dimethyl carbonate from CO2 and methanol over CeO2 catalysts of different morphologies0 aDirect synthesis of dimethyl carbonate from CO2 and methanol ove  aC V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIAbINDIAN ACAD SCIENCEScJUN  a957-9650 v1283 a<p>The direct synthesis of dimethyl carbonate (DMC) from carbon dioxide (CO2) and methanol is an attractive approach towards conversion of the greenhouse gas - CO2 into value-added chemicals and fuels. Ceria (CeO2) catalyzes this reaction. But the conversion efficiency of CeO2 is enhanced when the byproduct water in the reaction medium is separated by employing trapping agents like 2-cyanopyridine (2-CP). In this work, the influence of morphology of CeO2 on the direct synthesis of DMC in presence of 2-CP is reported. CeO2 catalysts of cube, rod, spindle and irregular morphology (Ce - C, Ce - R, Ce - S and Ce - N, respectively) were prepared, characterized and studied as catalysts in the said reaction conducted in a batch mode. Among all, Ce - S shows superior catalytic performance with nearly 100 mol% of DMC selectivity. Catalytic activity correlates with the concentration of acid and base sites of medium strength as well as defect sites. Ce - S has an optimum number of these active sites and thereby shows superior catalytic performance.</p>10aacid-base catalysis10aceria10aCO2 utilization10aDimethyl carbonate10ainfluence of morphology1 aUnnikrishnan, P.1 aDarbha, Srinivas  uhttps://library.ncl.res.in/content/direct-synthesis-dimethyl-carbonate-co2-and-methanol-over-ceo2-catalysts-different