01797nas a2200265   4500008004100000022001400041245011200055210006900167260007300236300001000309490000800319520082700327653001701154653001301171653004001184653004201224653002101266653001801287653003301305100002201338700001701360700001301377700001501390856012601405       2005                        eng d  a0926-860X00aBiphenyl hydrogenation over supported transition metal catalysts under supercritical carbon dioxide solvent0 aBiphenyl hydrogenation over supported transition metal catalysts  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUL  a43-470 v2883 a<p>Catalytic hydrogenation of biphenyl to bicyclohexyl, an organic hydrogen storage medium, was examined over supported transition metal catalysts in supercritical carbon dioxide solvent. The yield of bicyclohexyl was almost 100% over the charcoal-supported rhodium (Rh/C) and ruthenium (Ru/C) catalysts at the temperature of 323 K, which was much lower than that required for biphenyl hydrogenation in organic solvents (573 K). The initial activity was higher over the Rh/C catalyst, while the initial selectivity to bicyclohexyl was higher over the Ru/C catalyst. The conversion of biphenyl increased with increase in hydrogen and carbon dioxide pressures, while the selectivity to bicyclohexyl was independent of hydrogen and carbon dioxide pressures over both catalysts. (c) 2005 Elsevier B.V. All rights reserved.</p>10abicyclohexyl10abiphenyl10acharcoal-supported rhodium catalyst10acharcoal-supported ruthenium catalyst10aHydrogen storage10aHydrogenation10aSupercritical carbon dioxide1 aHiyoshi, Norihito1 aRode, C., V.1 aSato, O.1 aShirai, M.  uhttps://library.ncl.res.in/content/biphenyl-hydrogenation-over-supported-transition-metal-catalysts-under-supercritical-001600nas a2200265   4500008004100000022001400041245011900055210006900174260007300243300001200316490000800328520063300336653001600969653002100985653001801006653003301024653003201057653001301089100002201102700001701124700002901141700001601170700002101186856012701207       2006                        eng d  a0926-860X00aLow temperature hydrogenation of tetralin over supported rhodium catalysts in supercritical carbon dioxide solvent0 aLow temperature hydrogenation of tetralin over supported rhodium  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAUG  a194-1980 v3103 a<p>Hydrogenation of tetralin was studied over supported rhodium catalysts in supercritical carbon dioxide solvent at 333 K. The results were compared with those in an organic solvent and under neat conditions. Higher cis-decalin yield was obtained in supercritical carbon dioxide solvent than under non-supercritical conditions. It was observed that higher hydrogen concentration at the surface in supercritical carbon dioxide solvent led to fast direct hydrogenation of tetralin to cis-decalin; the flipping of the intermediate, octalin, to give trans-decalin could be prevented. (C) 2006 Elsevier B.V. All rights reserved.</p>10acis-decalin10aHydrogen storage10aHydrogenation10aSupercritical carbon dioxide10asupported rhodium catalysts10atetralin1 aHiyoshi, Norihito1 aMine, Eiichi1 aRode, Chandrashekhar, V.1 aSato, Osamu1 aShirai, Masayuki  uhttps://library.ncl.res.in/content/low-temperature-hydrogenation-tetralin-over-supported-rhodium-catalysts-supercritical-001460nas a2200265   4500008004100000022001400041245012400055210006900179260007300248300001200321490000800333520051100341653001500852653001800867653001600885653003300901653002900934100001500963700001700978700001700995700001501012700001301027700002201040856013201062       2006                        eng d  a0920-586100aRing hydrogenation of naphthalene and 1-naphthol over supported metal catalysts in supercritical carbon dioxide solvent0 aRing hydrogenation of naphthalene and 1naphthol over supported m  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUN  a248-2530 v1153 a<p>Catalytic ring hydrogenations of naphthalene and 1-naphthol were studied over several supported metal catalysts in supercritical carbon dioxide solvent at low temperature. Higher concentration of hydrogen in supercritical carbon dioxide and lower reaction temperature were responsible for higher catalyst activity and selectivities to the desired partial ring hydrogenated products as compared with those observed in organic solvent for the same catalyst. (c) 2006 Elsevier B.V. All rights reserved.</p>10a1-naphthol10aHydrogenation10aNaphthalene10aSupercritical carbon dioxide10asupported metal catalyst1 aShirai, M.1 aRode, C., V.1 aMine, Eiichi1 aSasaki, A.1 aSato, O.1 aHiyoshi, Norihito  uhttps://library.ncl.res.in/content/ring-hydrogenation-naphthalene-and-1-naphthol-over-supported-metal-catalysts-supercritical-0