01964nas a2200265   4500008004100000022001400041245017500055210006900230260007300299300001200372490000600384520095100390653002101341653001301362653001301375653001101388653002201399653001801421653002701439653002801466100002601494700001801520700002801538856013201566       2007                        eng d  a1566-736700aReduction of oxygen by hydroxylammonium salt or hydroxylamine over supported Au nanoparticles for in situ generation of hydrogen peroxide in aqueous or non-aqueous medium0 aReduction of oxygen by hydroxylammonium salt or hydroxylamine ov  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAY  a811-8160 v83 a<p>Reaction of O-2 with hydroxylamine or its salts over a number of supported gold catalysts containing An nanoparticles (at 10-70 degrees C) has been studied at atmospheric pressure for the in situ generation of H2O2 (required for organic oxidation reactions in the synthesis of fine/specialty chemicals) in aqueous (water) or non-aqueous medium. Hydrogen peroxide in high yields with harmless by-products (viz. water and nitrogen) can be generated in situ by the reduction Of O-2 by hydroxylammonium sulfate (or chloride) or hydroxylamine using the supported gold catalysts particularly Au/Gd2O3, Au/La2O3 and Au/MgO, in aqueous (water) or non-aqueous (viz. methanol) medium at close to ambient conditions. The reduction of O-2 by hydroxylammonium salt to H2O2, however, requires preneutralization of the salt by alkali; in the absence of the neutralization, only water is formed in the reaction. (c) 2006 Elsevier B.V. All rights reserved.</p>10aAu Nanoparticles10aAu/Gd2O310aAu/La2O310aAu/MgO10aHydrogen peroxide10ahydroxylamine10ahydroxylammonium salts10ain situ H2O2 generation1 aChoudhary, Vasant, R.1 aJana, Prabhas1 aBhargava, Suresh, Kumar  uhttps://library.ncl.res.in/content/reduction-oxygen-hydroxylammonium-salt-or-hydroxylamine-over-supported-au-nanoparticles-situ02272nas a2200253   4500008004100000022001400041245007000055210006900125260009200194300001000286490000600296520136500302653002101667653003001688653004101718100002301759700001901782700002201801700001801823700002101841700003001862700002201892856010401914       2009                        eng d  a1947-293500aSynthesis of Sb-doped SnO2 nanowires and hyperbranched structures0 aSynthesis of Sbdoped SnO2 nanowires and hyperbranched structures  a26650 THE OLD RD, STE 208, VALENCIA, CA 91381-0751 USAbAMER SCIENTIFIC PUBLISHERScAPR  a38-430 v13 a<p>Branched nanostructures of semiconducting materials are of great interest for their potential applications in optoelectronic, photonic devices and sensors. We herein describe a facile single-step chemical vapor deposition route for the synthesis of Sb-SnO2 hyperbranched nanostructures comprised of elongated nanowires with 30-40 nm diameter and 10-20 Am length. The morphology and structure has been characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), selective area electron diffraction (SAED), and powder X-ray diffraction (XRD). Also, a possible mechanism is proposed for the growth of nanowires into the hyperbranched form on the basis of the substrate effect, the role of Au nanoparticles, and the effect of Sb doping on specific morphology evolution. Interestingly, electrical conductivity measurements as a function of temperature suggest a semiconducting behavior, despite being governed by different electron-transport mechanisms with activation energies of 0.55 and 0.17 eV, which correspond to pure SnO2 and Sb-SnO2 nanowires, respectively. A precise control over the operating parameters not only envisages custom-designed, branched structures by a simple and economical route but also offers an alternative method to the expensive and tedious nanofabrication techniques for industrial applications.</p>10aAu Nanoparticles10achemical vapor deposition10aSb-SnO2 Hyperbranched Nanostructures1 aSathe, Bhaskar, R.1 aPatil, Mrudula1 aWalke, Pravin, S.1 aVivek, J., P.1 aLele, Ashish, K.1 aPillai, Vijayamohanan, K.1 aMulla, Imtiaz, S.  uhttps://library.ncl.res.in/content/synthesis-sb-doped-sno2-nanowires-and-hyperbranched-structures-001879nas a2200217   4500008004100000022001400041245011700055210006900172260007300241300001000314490000800324520104600332653002101378653002801399653001701427653002201444653002301466100002101489700002101510856013001531       2016                        eng d  a0926-860X00aSpectroscopy and catalytic activity study of gold supported on barium titanate nanotubes for styrene epoxidation0 aSpectroscopy and catalytic activity study of gold supported on b  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAUG  a61-720 v5233 a<p>Gold (0.5-5 wt.%) supported on barium titanate nanotubes (Au/BaTNT) were prepared, characterized and for the first time, investigated as catalysts for selective oxidation of styrene with oxygen (O-2 or H-2 + O-2) and peroxides (H2O2 or TBHP). Conversion of styrene enhanced when H-2 was co-added to O-2 in the reactions. Au/BaTNT activated O-2 and H-2 and produced H2O2 in situ for use in oxidations. Peroxides were found better oxidants than O-2. At optimized conditions, styrene oxide selectivity of 80.1 wt.% at styrene conversion of 60.5 wt.% was achieved over Au(1 wt.%)/BaTNT using TBHP. Au particles (5.0-7.4 nm) were dispersed and decorated on the walls of BaTNT. They exhibited superior performance to the known Au catalysts in styrene oxidation. Reactive oxygen species formed during oxidation reactions were followed with in situ spectral characterizations (diffuse reflectance UV-vis and FT -Raman). Au/BaTNT was reusable in four recycles with little loss in catalytic activity. (C) 2016 Elsevier B.V. All rights reserved.</p>10aAu Nanoparticles10areactive oxygen species10aspectroscopy10aStyrene Oxidation10aTitanate nanotubes1 aNepak, Devadutta1 aSrinivas, Darbha  uhttps://library.ncl.res.in/content/spectroscopy-and-catalytic-activity-study-gold-supported-barium-titanate-nanotubes-styrene02074nas a2200229   4500008004100000022001400041245017700055210006900232260000900301300001400310490000700324520117400331653002101505653002801526653001801554653003701572653003001609100002201639700001901661700003301680856013101713       2021                        eng d  a1861-472800aActive and recyclable gold metal nanoparticles catalyst supported on nitrogen-doped mesoporous carbon for chemoselective hydrogenation of cinnamaldehyde to cinnamyl alcohol0 aActive and recyclable gold metal nanoparticles catalyst supporte  cSEP   a2702-27220 v163 aSeveral supported gold metal catalysts with different Au nanoparticles sizes were prepared and evaluated for the chemoselective hydrogenation of cinnamaldehyde (CA) to cinnamyl alcohol (CAL). To investigate the structure-activity relationship, stability of catalyst, heterogeneity and recyclability, the structural characteristics of materials and Au catalysts (fresh and spent catalysts) were studied by employing variety of physico-chemical techniques. The interrelationship among Au nanoparticles size (nm) with turnover frequency (h(-1)) of Au catalysts has also been explored. Among the various Au catalysts tested, nitrogen-doped mesoporous carbon (NMC) supported Au catalyst having homogeneously dispersed (78.8%) Au nanoparticles (1.6 nm) synthesized by sol-immobilization method (Au-NMC-SI) demonstrated improved catalytic activity affording 78% CAL selectivity and 94.2% CA conversion without using any promoter. Moreover, Au-NMC-SI catalyst exhibited good recyclability and stability. The catalyst synthesis approach described in this investigation opens up a novel strategy for the design of highly efficient metal nano-catalysts supported on NMC materials.10aAu Nanoparticles10aheterogeneous catalysis10aHydrogenation10aNitrogen-doped mesoporous carbon10aSupport-Metal interaction1 aNagpure, Atul, S.1 aGogoi, Pranjal1 aChilukuri, Satyanarayana, V.  uhttps://library.ncl.res.in/content/active-and-recyclable-gold-metal-nanoparticles-catalyst-supported-nitrogen-doped-mesoporous