01371nas a2200181   4500008004100000022001400041245010200055210006900157260007100226300001400297490000700311520065000318100002900968700002200997700001701019700002101036856013201057       2009                        eng d  a0888-588500aActivity and selectivity behavior of 1,2-epoxyethylbenzne hydrogenation in carbon dioxide solvent0 aActivity and selectivity behavior of 12epoxyethylbenzne hydrogen  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcNOV  a9457-94600 v483 a<p>Catalytic hydrogenation of 1,2-epoxyethylbenzene to 2-phenylethanol over charcoal-supported noble metal in carbon dioxide was studied, and the results were compared with those in heptane and methanol. Charcoal-supported palladium and platinum (Pd/C and Pt/C) catalysts were active metal species for the hydrogenation in solvents. The order of activities over palladium and platinum was heptane &lt; carbon dioxide &lt; methanol; however, the formation of dehydroxylated byproduct was suppressed in carbon dioxide solvent. Negative carbon dioxide pressure effect was observed over the Pd/C and Pt/C catalysts in the carbon dioxide solvent.</p>1 aRode, Chandrashekhar, V.1 aHiyoshi, Norihito1 aMine, Eiichi1 aShirai, Masayuki  uhttps://library.ncl.res.in/content/activity-and-selectivity-behavior-12-epoxyethylbenzne-hydrogenation-carbon-dioxide-solvent-001798nas 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-0