01798nas a2200193   4500008004100000022001400041245011500055210006900170260011000239300001600349490000600365520098200371100002101353700002301374700002501397700002101422700002901443856013201472       2013                        eng d  a2046-206900aActive sites in modified copper catalysts for selective liquid phase dehydration of aqueous glycerol to acetol0 aActive sites in modified copper catalysts for selective liquid p  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJUL  a16499-165080 v33 a<p>We report here the influence of oxides of various metals viz. Ba, Mg, Zr, Zn, Al, and Cr in modified copper catalysts, on the formation of different copper species and acid sites responsible for dehydration of aqueous glycerol to acetol. These catalysts were prepared by a co-precipitation method, among which the catalysts having higher acid strength and predominant Bronsted acidity (Cu-Mg, Cu-Zr and Cu-Al) gave the highest acetol selectivity (76-92%), while the catalysts with lower acidity such as Cu-Zn showed very poor (25%) selectivity to acetol in spite of the highest conversion of 68%. Nevertheless, catalysts exhibiting higher activity and acetol selectivity also showed the presence of metallic Cu confirmed by XRD and XANES-EXAFS characterization. Based on these results, two different catalytic pathways have been proposed highlighting the role of Lewis and Bronsted acidity along with the metal sites in individual steps of glycerol dehydration reaction.</p>1 aMane, Rasika, B.1 aYamaguchi, Aritomo1 aMalawadkar, Atul, V.1 aShirai, Masayuki1 aRode, Chandrashekhar, V.  uhttps://library.ncl.res.in/content/active-sites-modified-copper-catalysts-selective-liquid-phase-dehydration-aqueous-glycerol-002129nas a2200253   4500008004100000022001400041245012800055210006900183260007700252300001400329490000600343520121900349653001301568653001101581653001501592653001301607653001401620100002101634700002001655700002501675700001901700700002901719856012701748       2014                        eng d  a1867-388000aEffect of composition and pretreatment parameters on activity and stability of Cu-Al catalysts for water-gas shift reaction0 aEffect of composition and pretreatment parameters on activity an  aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcJUN  a1698-17060 v63 a<p>We investigated various Cu species responsible for highly efficient Cu-Al oxide catalyst for the water-gas shift reaction (WGSR). The formation of various Cu species was achieved by systematically varying the Cu-Al composition in the coprecipitated mixed Cu-Al oxides. The Cu-Al composition of 70:30 (Cu-Al-7) was the best for WGSR using the reformate gas composition. In addition, the Cu-Al-7 catalyst reduced under 100% H-2, was relatively stable with time on stream of 100 h, at higher gas hourly space velocity of 36201 h(-1). The structural investigation of our coprecipitated catalysts with varying Cu-Al compositions revealed the formation of nonzero oxidation state copper and metallic Cu to be essential for the observed WGSR activity. In addition, the highest activity and stability of Cu-Al-7 catalysts reduced under 100% H-2 at lower temperature was attributed to particle-size stabilization and a lower extent of Cu aggregation by Cu2O and boehmite phases, respectively, along with the formation of various Cu species during the activation protocol for 12 h. Complete CO2 selectivity without methanation was observed for all the Cu-Al compositions irrespective of their pretreatment conditions.</p>10aaluminum10aCopper10afuel cells10aHydrogen10areduction1 aMane, Rasika, B.1 aJeong, Dae-Woon1 aMalawadkar, Atul, V.1 aRoh, Hyun-Seog1 aRode, Chandrashekhar, V.  uhttps://library.ncl.res.in/content/effect-composition-and-pretreatment-parameters-activity-and-stability-cu-al-catalysts-001248nas a2200181   4500008004100000022001400041245012800055210006900183260011000252300001400362490000600376520045600382100002100838700002500859700002500884700002900909856012800938       2014                        eng d  a2046-206900aSurface synergism of an Ag-Ni/ZrO2 nanocomposite for the catalytic transfer hydrogenation of bio-derived platform molecules0 aSurface synergism of an AgNiZrO2 nanocomposite for the catalytic  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcFEB  a9730-97360 v43 a<p>Levulinic acid was completely and selectively converted to GVL, in the presence of formic acid over an Ag-Ni/ZrO2 catalyst. The synergism between Ag and Ni in transfer hydrogenation eliminates the need for external hydrogen, making the process safer. The magnetic nature of the catalyst offers easy recovery for efficient recycling. This approach is standardized for the hydrogenation of several C-3-C-6 platform molecules in an aqueous medium.</p>1 aHengne, Amol, M.1 aMalawadkar, Atul, V.1 aBiradar, Narayan, S.1 aRode, Chandrashekhar, V.  uhttps://library.ncl.res.in/content/surface-synergism-ag-nizro2-nanocomposite-catalytic-transfer-hydrogenation-bio-derived-0