01809nas a2200277 4500008004100000022001400041245013400055210006900189260007500258300001200333490000700345520077700352653002101129653002201150653002901172653001801201653003401219100002001253700002801273700002301301700002401324700002101348700002501369700001601394856012101410 2013 eng d a1022-552800aPromising stability of gold-based catalysts prepared by direct anionic exchange for DeNO (x) applications in lean burn conditions0 aPromising stability of goldbased catalysts prepared by direct an a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGER/PLENUM PUBLISHERScMAY a157-1640 v563 a

Supported gold catalysts on gamma-Al2O3 have been investigated in the catalytic reduction of NO (x) in simulated Diesel exhaust gas conditions. Different parameters have been examined essentially the mode of gold incorporation via classical deposition-precipitation and anionic exchange methods and the nature of the pre-activation thermal treatment. The resistance to thermal ageing under reactive conditions at 500 A degrees C was found completely different with a significant rate enhancement on anionic-exchange samples. Further comparisons also show that the nature of the pre-activation thermal treatment influences the extent of surface reconstructions during thermal ageing with a detrimental effect of reductive pre-treatment on the catalytic performances.

10aAnionic-exchange10aAu/Al2O3 catalyst10aDeposition-precipitation10aNOx abatement10aSelective catalytic reduction1 aNguyen, D., -L.1 aUmbarkar, Shubhangi, B.1 aDongare, Mohan, K.1 aLancelot, Christine1 aGirardon, J., S.1 aDujardin, Christophe1 aGranger, P. uhttp://library.ncl.res.in/content/promising-stability-gold-based-catalysts-prepared-direct-anionic-exchange-deno-x-002298nas a2200253 4500008004100000022001400041245011800055210006900173260000800242300001400250490000600264520143200270653001201702653002801714653001801742653002401760653001401784100002301798700002401821700002301845700002001868700002801888856012801916 2014 eng d a1867-388000aPalladium nanoparticles supported on magnesium hydroxide fluorides: a selective catalyst for olefin hydrogenation0 aPalladium nanoparticles supported on magnesium hydroxide fluorid cNOV a3182-31910 v63 a

A one-pot synthesis of palladium nanoparticles supported on magnesium hydroxide fluoride has been performed with the fluorolytic sol-gel method. The prepared catalysts were characterized by using various physicochemical techniques. The sol-gel method led to high surface area (>135 m(2)g(-1)), mesoporous catalysts (pore volume=0.19-0.23 cm(3)g(-1), pore diameter=3-5 nm) with uniformly dispersed palladium nanoparticles approximately 2 nm in diameter on the surface. The catalysts synthesized by using different concentrations of aqueous hydrofluoric acid exhibited changing surface and acidic properties. Very high dispersion of palladium on magnesium fluoride (47%) was obtained with 1 wt% palladium loading. The catalysts were used for hydrogenation of various olefins in the presence of other organic functionalities at room temperature and atmospheric hydrogen pressure. Various substituted olefins were hydrogenated with almost 100% conversion and selectivity. The catalysts were recycled efficiently over five cycles without appreciable loss in catalytic activity. There was no palladium leaching under the reaction conditions, which was confirmed by inductively coupled plasma atomic emission spectroscopy analysis. Activation of olefin on the catalyst surface could not be observed by in situ FTIR studies, indicating facile activation of hydrogen on the palladium supported on magnesium hydroxide fluoride.

10aalkenes10aheterogeneous catalysis10aHydrogenation10amagnesium fluorides10aPalladium1 aAcham, Vaibhav, R.1 aBiradar, Ankush, V.1 aDongare, Mohan, K.1 aKemnitz, Erhard1 aUmbarkar, Shubhangi, B. uhttp://library.ncl.res.in/content/palladium-nanoparticles-supported-magnesium-hydroxide-fluorides-selective-catalyst-olefin02259nas a2200193 4500008004100000245012500041210006900166260000800235300001600243490000600259520153400265100002301799700002301822700002001845700002001865700002301885700002801908856012901936 2017 eng d00aPalladium supported on fluorinated magnesium hydroxide: an efficient catalyst for hydrogenation under ambient conditions0 aPalladium supported on fluorinated magnesium hydroxide an effici cNOV a10618-106270 v23 a

In this study palladium supported on fluorinated magnesium hydroxide (Pd-MgF2-x(OH)(x)) was synthesized by fluorination of magnesium hydroxide using aqueous HF as fluorinating agent. The Mg(OH)(2) dissolves in HF and precipitates as magnesium hydroxide fluoride. The Pd precursor was added in the same pot during precipitation of MgF2-x(OH)(x). The final catalyst after drying at 250 degrees C has shown very high efficiency for hydrogenation of styrene and range of nitro aromatics at room temperature and atmospheric pressure. Hydrogenation of styrene has led to 37% conversion with 100% selectivity for hydrogenation of double bond after 3 h. The catalyst was successfully recycled for styrene hydrogenation without appreciable loss in the activity. Further hydrogenation of nitro-aromatics was achieved with 99% conversion and 100% aniline selectivity at room temperature and atmospheric pressure. The turnover number of similar to 21774 was obtained for nitrobenzene hydrogenation. The catalyst has shown mesoporous nature (pore volume 0.25 cc/g, pore diameter 4.8 nm) with very high surface area of 106 m(2)/g. The palladium particle size was found to be in the range of 10-11 nm. Acidity measurements by FTIR of adsorbed pyridine revealed presence of Lewis acidic sites with moderate acidity. Mechanistic studies using in-situ FTIR analysis for nitrobenzene hydrogenation revealed activation of nitrobenzene on the Lewis acid sites of the support whereas activation of hydrogen by heterolytic cleavage on Pd center.

1 aKokane, Reshma, S.1 aAcham, Vaibhav, R.1 aKulal, Atul, B.1 aKemnitz, Erhard1 aDongare, Mohan, K.1 aUmbarkar, Shubhangi, B. uhttp://library.ncl.res.in/content/palladium-supported-fluorinated-magnesium-hydroxide-efficient-catalyst-hydrogenation-under01766nas a2200217 4500008004100000022001400041245013400055210006900189260000900258300001600267490000700283520096400290100001901254700001601273700002001289700002301309700003401332700002301366700002801389856013101417 2021 eng d a1144-054600aPalladium supported on magnesium hydroxyl fluoride: an effective acid catalyst for the hydrogenation of imines and N-heterocycles0 aPalladium supported on magnesium hydroxyl fluoride an effective  cOCT  a19572-195830 v453 aPalladium catalysts supported on acidic fluorinated magnesium hydroxide Pd/MgF2-x(OH)(x) were prepared through precipitation or impregnation methods. Applications to the hydrogenation of various aldimines and ketimines resulted in good catalytic activities at mild temperatures using one atmosphere of hydrogen. Quinolines, pyridines and other N-heterocycles were successfully hydrogenated at higher temperature and hydrogen pressure using low palladium loadings and without the use of any acid additive. Such reactivity trend confirmed the positive effect of the Bronsted and Lewis acid sites from the fluorinated magnesium hydroxide support resulting in the effective pre-activation of N-heterocycle substrates and therefore in the good catalytic activity of the palladium nanoparticles during the hydrogenations. As demonstrated in the hydrogenation of imines, the catalyst was recycled up to 10 times without either loss of activity or palladium leaching.1 aKokane, Reshma1 aCorre, Yann1 aKemnitz, Erhard1 aDongare, Mohan, K.1 aAgbossou-Niedercorn, Francine1 aMichon, Christophe1 aUmbarkar, Shubhangi, B. uhttp://library.ncl.res.in/content/palladium-supported-magnesium-hydroxyl-fluoride-effective-acid-catalyst-hydrogenation-imines01864nas a2200229 4500008004100000022001400041245008600055210006900141260000900210490000700219520109700226653001701323653002301340653002101363653001601384653002501400100002401425700002401449700002301473700002801496856011001524 2023 eng d a1861-472800aPhenol hydrogenation to cyclohexanol catalysed by palladium supported on CuO/CeO20 aPhenol hydrogenation to cyclohexanol catalysed by palladium supp cJUN 0 v183 a

Hydrogenation of phenol to cyclohexanone/cyclohexanol is an important reaction in production of nylon-6, nylon-66 and in petroleum industry. Liquid phase phenol hydrogenation over Pd-CuO/CeO2 was carried out under mild conditions. Palladium impregnated over CuO/CeO2 synthesized by co-precipitation method showed excellent catalytic activity for phenol hydrogenation (99% conversion with 80% cyclohexanol yield) at 90 degrees C and 10 bar H-2 pressure in water. Commercial 10%Pd/C showed only 8% phenol conversion under identical conditions. The detailed characterization revealed significant improvement in surface area of ceria after addition of CuO and decrease in crystallite size with creation of defects in CeO2 lattice. XPS analysis showed Pd loading on CuO/CeO2 to cause hydrogen spillover on the surface leading to increase in the oxygen vacancies. The interaction of phenol with catalyst surface studied by detailed FTIR analysis, revealed activation of phenol on oxygen vacancy of ceria as phenoxide ion with perpendicular orientation of aromatic ring on catalyst surface.

10aCyclohexanol10aHydrogen spillover10aoxygen vacancies10aPd-CuO/CeO210aphenol hydrogenation1 aKasabe, Mirabai, M.1 aKotkar, Vaibhav, R.1 aDongare, Mohan, K.1 aUmbarkar, Shubhangi, B. uhttp://library.ncl.res.in/content/phenol-hydrogenation-cyclohexanol-catalysed-palladium-supported-cuoceo2