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-000930nas a2200193   4500008004100000022001400041245010000055210006900155260008400224300001200308490000700320520019700327100002200524700001400546700001700560700001300577700001500590856013100605       2005                        eng d  a0366-702200aEnhanced selectivity to decalin in naphthalene hydrogenation under supercritical carbon dioxide0 aEnhanced selectivity to decalin in naphthalene hydrogenation und  a1-5 KANDA-SURUGADAI CHIYODA-KU, TOKYO, 101-8307, JAPANbCHEMICAL SOC JAPANcMAR  a424-4250 v343 a<p>A charcoal-supported rhodium catalyst was highly active and selective to decalin for the hydrogenation of naphthalene at very low temperature (333 K) under supercritical carbon dioxide.</p>1 aHiyoshi, Norihito1 aMiura, R.1 aRode, C., V.1 aSato, O.1 aShirai, M.  uhttps://library.ncl.res.in/content/enhanced-selectivity-decalin-naphthalene-hydrogenation-under-supercritical-carbon-dioxide-001005nas a2200229   4500008004100000022001400041245011500055210006900170260008400239300001200323490000700335520018600342100001700528700001400545700001300559700001300572700001300585700001500598700001700613700001500630856013000645       2005                        eng d  a0366-702200aPartial ring hydrogenation of naphthols over supported metal catalysts in supercritical carbon dioxide solvent0 aPartial ring hydrogenation of naphthols over supported metal cat  a1-5 KANDA-SURUGADAI CHIYODA-KU, TOKYO, 101-8307, JAPANbCHEMICAL SOC JAPANcJUN  a782-7830 v343 a<p>Selective ring hydrogenation of naphthols to tetrahydronaphthols and tetralones proceeded at 323 K over a charcoal supported rhodium catalyst in supercritical carbon dioxide.</p>1 aMine, Eiichi1 aHaryu, E.1 aArai, K.1 aSato, T.1 aSato, O.1 aSasaki, A.1 aRode, C., V.1 aShirai, M.  uhttps://library.ncl.res.in/content/partial-ring-hydrogenation-naphthols-over-supported-metal-catalysts-supercritical-carbon-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-002396nas a2200301   4500008004100000022001400041245009500055210006900150260007300219300001000292490000800302520135400310653002301664653001701687653004501704653001801749653001901767653002001786653004101806100002301847700002101870700001701891700001801908700001801926700001501944700001701959856011801976       2009                        eng d  a0926-860X00aCharacterization of clay intercalated cobalt-salen catalysts for the oxidation of p-cresol0 aCharacterization of clay intercalated cobaltsalen catalysts for   aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcNOV  a16-230 v3703 a<p>The intercalation of cobalt-salen complexes into the interlamelar spaces of montmorillonite clay was investigated by various characterization studies. The ``neat'' cobalt-salen complex showed a weight loss at 368 degrees C while the weight loss for the corresponding intercalated complex was observed at much higher temperature of 492 degrees C due to decomposition of the complex. The thermal stabilization observed was due to the host-guest interaction of clay and metal complex and thus confirmed the intercalation. The XANES spectrum of Co(salen)-mont sample revealed the change of symmetry from the tetrahedral in plane to the octahedral structure having an axial bonding of oxygen to the cobalt, indicating that cobalt atoms in Co(salen)-mont were coordinated axially with the lattice oxygen of montmorillonite. Both XANES and EXAFS results indicated that cobalt atoms in Co(salen)-mont form two additional Co-O bonds with a bond length of 0.199 nm by the intercalation while retaining the Co-salen structure. Co-salen intercalated into the montmorillonite clay showed the highest activity for the air oxidation of p-cresol, giving 88% selectivity to the oxidation products. Effects of NaOH concentration and various solvents on the conversion and selectivity patterns also have been studied. (C) 2009 Elsevier B.V. All rights reserved.</p>10aCobalt-oxygen bond10aCobalt-salen10aExtended X-ray absorption fine structure10aIntercalation10aLattice oxygen10aMontmorillonite10aX-ray absorption near edge structure1 aKshirsagar, V., S.1 aGarade, Ajit, C.1 aMane, R., B.1 aPatil, K., R.1 aYamaguchi, A.1 aShirai, M.1 aRode, C., V.  uhttps://library.ncl.res.in/content/characterization-clay-intercalated-cobalt-salen-catalysts-oxidation-p-cresol-001946nas a2200229   4500008004100000022001400041245009200055210006900147260007300216300001200289490000700301520114400308653002701452653002001479653001201499653001601511100001401527700002101541700001501562700001701577856012201594       2013                        eng d  a0169-131700aMetal cation-exchanged montmorillonite clay as catalysts for hydroxyalkylation reaction0 aMetal cationexchanged montmorillonite clay as catalysts for hydr  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR  a141-1460 v743 a<p>Several solid acid catalysts were prepared by exchanging metal cations such as Zn2+, Fe3+ and Al3+ with montmorillonite clay. Among these, Al-montmorillonite showed the highest acidity determined by the pyridine-IR as well as NH3-TPD methods. A systematic comparison of the performance of these catalysts along with parent montmorillonite was carried out for the hydroxyalkylation of p-cresol with formaldehyde to give 2, 2'-methylenebis (4-methyl phenol) (DAM). It was found that the activity of these catalysts was in accordance with the increase in acidity of parent montmorillonite after the exchange of cations in the order of Zn2+, Fe3+ and Al3+. The selectivity pattern was also influenced by the exchanged cations. Since Al-montmorillonite showed the highest conversion of 51% with 98% selectivity to DAM, the effects of various reaction parameters, namely, mole ratio, catalyst concentration, temperature, reaction time on conversion and selectivity pattern were also studied using the same catalyst This catalyst also showed an excellent stability as evidenced by its eight times reuse. (C) 2012 Published by Elsevier B.V.</p>10aCations-exchanged clay10aMontmorillonite10aNH3-TPD10aPyridine-IR1 aJha, Ajay1 aGarade, Ajit, C.1 aShirai, M.1 aRode, C., V.  uhttps://library.ncl.res.in/content/metal-cation-exchanged-montmorillonite-clay-catalysts-hydroxyalkylation-reaction-002066nas a2200265   4500008004100000022001400041245014100055210006900196260007300265300001200338490000800350520112500358653002201483653001501505653002001520653000801540653002101548100002001569700001401589700001801603700001801621700001501639700001701654856012901671       2014                        eng d  a0926-860X00aEffect of preparation parameters on characterization and activity of Co3O4 catalyst in liquid phase oxidation of lignin model substrates0 aEffect of preparation parameters on characterization and activit  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcOCT  a130-1380 v4873 a<p>The nano structured spinel cobalt oxide (Co3O4) was prepared via simple co-precipitation method and its catalytic activity was evaluated for the liquid phase aerobic oxidation of lignin sub structure compounds such as veratryl alcohol. Catalyst preparation parameters influenced its morphology eventually affecting its oxidation activity. Thus, nano rod shaped CO3O4 catalyst showed 75% and 38% conversion of veratryl alcohol with complete selectivity to veratryl aldehyde in toluene and water, respectively, under base free condition. The influence of reaction conditions, such as temperature, oxygen pressure and catalyst loading was studied to obtain the optimum product yield and selectivity to the desired product. Furthermore, oxidation of various sub-structures of lignin model compounds was also studied over the same catalyst which was found to be in the following order: secondary alcohol &gt;di-substituted &gt; tri-substituted &gt; monosubstituted &gt; non-substitution. The stability of the catalyst was confirmed by its successful recycle for three times. (c) 2014 Elsevier B.V. All rights reserved.</p>10aConiferyl alcohol10aNano Co3O410aSinapyl alcohol10aTPR10aVeratryl alcohol1 aMate, Vivek, R.1 aJha, Ajay1 aJoshi, U., D.1 aPatil, K., R.1 aShirai, M.1 aRode, C., V.  uhttps://library.ncl.res.in/content/effect-preparation-parameters-characterization-and-activity-co3o4-catalyst-liquid-phase-001139nas a2200133   4500008004100000245012100041210006900162260000800231520058800239100001500827700001600842700001700858856013000875       2019                        eng d00aStereoselective aromatic ring hydrogenation over supported rhodium catalysts in supercritical carbon dioxide solvent0 aStereoselective aromatic ring hydrogenation over supported rhodi  cJAN3 aThe combination of supported rhodium metal catalysts and supercritical carbon dioxide solvent was effective for the stereoselective ring hydrogenations of aromatic compounds at low temperature. Higher solubility of hydrogen in supercritical carbon dioxide provides higher concentration of hydrogen on the rhodium surface, but lower that of the intermediate on rhodium surface, which suppresses the flipping of surface intermediate, leading to higher catalyst activities and cis selectivities to the corresponding ring-hydrogenated products as compared with those in organic solvents.1 aShirai, M.1 aHiyoshi, N.1 aRode, C., V.  uhttps://library.ncl.res.in/content/stereoselective-aromatic-ring-hydrogenation-over-supported-rhodium-catalysts-supercritical