01963nas a2200217 4500008004100000022001400041245011300055210006900168260010100237300001200338490000800350520108300358653002801441653002001469653003301489653002801522653002801550100002001578700002101598856012601619 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

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.

10aaliphatic polycarbonate10aCO2 utilization10aDouble-metal cyanide complex10aheterogeneous catalysis10ahyperbranched polyester1 aSebastian, Joby1 aDarbha, Srinivas uhttp://library.ncl.res.in/content/solid-double-metal-cyanide-catalysts-synthesis-hyperbranched-polyesters-and-aliphatic-001486nas a2200217 4500008004100000022001400041245010000055210006900155260010200224300001300326490000800339520061100347653002000958653004600978653002301024653002401047100002301071700002301094700002101117856013001138 2014 eng d a0974-362600aSynthesis of fatty monoester lubricant base oil catalyzed by Fe-Zn double-metal cyanide complex0 aSynthesis of fatty monoester lubricant base oil catalyzed by FeZ aC V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIAbINDIAN ACAD SCIENCEScJUL a997-10030 v1263 a

Fatty monoester lubricant base oils as high as 96.7 mol% were prepared by reacting methyl oleate with long-chain alcohols viz., 2-ethyl-1-hexanol (C-8-OH), 1-decanol (C10OH) and 1-dodecanol (C12OH) in the presence of a solid Fe-Zn double-metal cyanide (DMC) complex catalyst. Unlike many other acid catalysts, DMC doesn't produce undesired ether side products. The catalyst was reusable in four recycling experiments with little loss in catalytic activity and ester yield. The long-chain esters prepared in the study have the desired physical properties for their application as lubricant base oils.

10aFatty monoester10aFe-Zn double-metal cyanide (DMC) catalyst10alubricant base oil10atransesterification1 aRaut, Ravindra, K.1 aShaikh, Mehejabeen1 aDarbha, Srinivas uhttp://library.ncl.res.in/content/synthesis-fatty-monoester-lubricant-base-oil-catalyzed-fe-zn-double-metal-cyanide-complex-001369nas a2200217 4500008004100000022001400041245008100055210006900136260000900205300001200214490000700226520066000233653002200893653001200915653003000927653003000957653000900987100002100996700002101017856011301038 2015 eng d a1566-736700aSelective aerobic oxidation of alcohols over Au-Pd/sodium titanate nanotubes0 aSelective aerobic oxidation of alcohols over AuPdsodium titanate cJAN  a149-1530 v583 a

catalytic application of Au-Pd nanoparticles supported on sodium titanate nanotubes (NaTNTs) for liquid-phase aerobic oxidation of alcohols is reported, for the first time. This reaction occurs at 80-120 degrees C, 1 atm and solvent-/alkali-free conditions yielding the corresponding carbonyls in high selectivity. This catalyst was reusable and found to be more active/selective than the corresponding monometallic Au and Pd catalysts and Au-Pd/TiO2. Higher dispersion, smaller particle size and higher amount of electron density at gold are the causes for the superior activity of Au-Pd/NaTNT catalyst. (C) 2014 Elsevier B.V. All rights reserved.

10aaerobic oxidation10aAlcohol10aBimetallic Au-Pd catalyst10aSodium titanate nanotubes10aTiO21 aNepak, Devadutta1 aDarbha, Srinivas uhttp://library.ncl.res.in/content/selective-aerobic-oxidation-alcohols-over-au-pdsodium-titanate-nanotubes-001722nas a2200157 4500008004100000022001400041245014900055210006900204260011000273300001600383490000600399520100400405100002001409700002101429856011401450 2015 eng d a2046-206900aStructure-induced catalytic activity of Co-Zn double-metal cyanide complexes for terpolymerization of propylene oxide, cyclohexene oxide and CO20 aStructureinduced catalytic activity of CoZn doublemetal cyanide  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcFEB a18196-182030 v53 a

The application of Co-Zn double-metal cyanide (DMC) complexes as catalysts for selective terpolymerization of propylene oxide, cyclohexene oxide and CO2 producing polycarbonates is reported for the first time. DMC complexes were prepared with and without using a co-complexing agent. The catalyst with monoclinic/rhombohedral crystal structure and strong Lewis acidity, prepared without using a co-complexing agent showed higher initial activity than that with a cubic structure prepared using a co-complexing agent. Interestingly, no induction period in the terpolymerization reaction was observed. The terpolymer has 75.5 mol% of carbonate fraction in its composition and an average molecular weight of 22 700 and polydispersity index of 2.97. It is characterized by a T-g of 55 degrees C. This structure-induced catalytic activity of DMC can open up new avenues for its applications in other reactions. The influence of process parameters on the catalytic activity of DMC was investigated.

1 aSebastian, Joby1 aDarbha, Srinivas uhttp://library.ncl.res.in/content/structure-induced-catalytic-activity-co-zn-double-metal-cyanide-complexes-001779nas a2200169 4500008004100000022001400041245008800055210006900143260000900212300001200221490000700233520119400240100002201434700001901456700002101475856011301496 2020 eng d a2044-475300aSelective, bifunctional Cu-WOx/Al2O3 catalyst for hydrodeoxygenation of fatty acids0 aSelective bifunctional CuWOxAl2O3 catalyst for hydrodeoxygenatio cJAN  a268-2770 v103 a

Selective hydrodeoxygenation of oleic acid (OA; in a batch reactor, at 300 degrees C, 30 bar H-2 pressure, reaction time of 1 h and reactant-to-catalyst weight ratio of 2 g OA/0.2 g) forming n-octadecane in yields as high as 93% over a non-noble metal, sulfur-free, bimetallic Cu-WOx/Al2O3 catalyst is reported for the first time. Several Cu-WOx/Al2O3 compositions were prepared by a sequential wet-impregnation method and evaluated. A catalyst with 10 wt% Cu and 4 wt% W enabled the highest activity and selectivity. Upon adding WOx, the amount of moderate and strong acid sites increased and more Cu in the catalyst was in reduced electron-rich metallic (Cu-0) state. The crystallite size and dispersion of Cu were little affected. WOx promoted the fatty acid hydrodeoxygenation activity of Cu. While a monometallic Cu catalyst (10Cu/Al2O3) yielded n-octadecane and n-heptadecane along with high amounts of intermediate octadecanol and octadecanal products, the bimetallic catalyst (10Cu-4WO(x)/Al2O3) gave mainly n-octadecane. Acidity and the high amount of reduced Cu-0 species are responsible for the high catalytic hydrodeoxygenation performance of this bimetallic catalyst.

1 aJanampelli, Sagar1 aSethia, Govind1 aDarbha, Srinivas uhttp://library.ncl.res.in/content/selective-bifunctional-cu-woxal2o3-catalyst-hydrodeoxygenation-fatty-acids01599nas a2200229 4500008004100000022001400041245008200055210006900137260000900206300001200215490000700227520086500234653003401099653001501133653001901148653001501167653001601182653001901198100002501217700002101242856010601263 2020 eng d a0161-494000aSolid catalysts for conversion of furfural and its derivatives to alkanediols0 aSolid catalysts for conversion of furfural and its derivatives t cOCT  a566-6060 v623 a

Alkanediols with five and six carbon atoms (1,2- & 1,5-pentanediols and 1,2- & 1,6-hexanediols, respectively) are an important class of industrial chemicals having wide application. Their production from lignocellulosic biomass-derived furfural and its derivatives using solid catalysts is a sustainable and attractive approach. Several bifunctional catalysts with metal (for hydrogenation/hydrogenolysis) and acid/base (for ring opening) functionalities have been reported. Effective and selective conversion of furfurals to a desired diol is still a challenge. This review discusses the recent advances in catalyst development for pentane- and hexanediols. The reaction pathways, active sites, and possible reaction mechanisms over the solid catalysts are discussed. A comparative catalytic activity data of the known catalysts are reported.

10a5-hydroxymethylfurfural (HMF)10aAlkanediol10afurfural (FAL)10ahexanediol10apentanediol10asolid catalyst1 aEnjamuri, Nagasuresh1 aDarbha, Srinivas uhttp://library.ncl.res.in/content/solid-catalysts-conversion-furfural-and-its-derivatives-alkanediols09571nas a2200145 4500008004100000245011200041210006900153260000800222300001200230490000800242520900700250100002209257700002109279856012509300 2021 eng d00aSelective deoxygenation of fatty acids to fuel-range hydrocarbons over Pt-MOx/ZrO2 (M = Mo and W) catalysts0 aSelective deoxygenation of fatty acids to fuelrange hydrocarbons cSEP a174-1800 v3753 a

A comparative catalytic activity study of Pt-MoOx/ZrO2 and Pt-WOx/ZrO2 for deoxygenation of oleic acid (OA) forming fuel-range, linear hydrocarbons is reported. These catalysts (with 4 wt% Pt and 8 wt% Mo or W) were prepared by a sequential wet-impregnation method and characterized for the structural and electronic properties. Pt-MoOx/ZrO2 showed higher catalytic activity than Pt-WOx/ZrO2. Hydrodeoxygenation was the selective pathway over these bifunctional catalysts yielding n-octadecane. High conversion of OA was achieved at 200 °C itself. On the contrary, monometallic Pt/ZrO2 was weakly active. It was selective mainly toward decarboxylation/decarbonylation producing n-heptadecane. Higher amounts of Pt and metal oxide in reduced forms are responsible for the high hydrodeoxygenation activity and selectivity of these reusable, bimetallic catalysts.

1 aJanampelli, Sagar1 aDarbha, Srinivas uhttp://library.ncl.res.in/content/selective-deoxygenation-fatty-acids-fuel-range-hydrocarbons-over-pt-moxzro2-m-mo-and-w