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-002179nas a2200229   4500008004100000022001400041245013600055210006900191260007300260300001200333490000800345520133700353653001301690653001701703653001101720653003201731653001301763100001501776700001501791700001401806856012901820       2005                        eng d  a0926-860X00aVanadium-containing ordered mesoporous silicas: synthesis, characterization and catalytic activity in the hydroxylation of biphenyl0 aVanadiumcontaining ordered mesoporous silicas synthesis characte  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAUG  a148-1580 v2903 a<p>A series of vanadium-containing ordered mesoporous MCM-41 materials (V-OMS) have been synthesized by direct hydrothermal (VMCM-41) and grafting (V/MCM-41) methods using hexadecyl trimethyl ammonium bromide (HDTMABr) as the structure-directing agent. The physico-chemical properties of the vanadium-containing materials were characterized in detail by ICP-OES, XRD, Fr-IR, N-2 adsorption-desorption, DRUV-VIS, TPR, XPS and SEM techniques. The redox performances of the vanadium-modified mesoporous materials were tested in the hydroxylation of biphenyl using aqueous H2O2 (30 wt.%) as oxidant. For a better exploitation of the catalytic activity, the reaction parameters are optimized in terms of temperature, solvent, oxidant, etc. A comparison between the catalytic activity values of the vanadium-containing mesoporous materials prepared by the two routes shows that vanadium-substituted (V-MCM-41) materials had increased activity and improved selectivity for mono hydroxyl products in the hydroxylation reaction of biphenyl compared to the V/MCM-41 catalysts. The heterogenity of the catalysts was verified by a series of leaching studies. Both the catalysts enhance the leaching of active vanadia species during the reaction; among them, V/MCM-41 shows the least heterogenity. (c) 2005 Elsevier B.V. All rights reserved.</p>10abiphenyl10aheterogenity10aMCM-4110aMesoporous molecular sieves10aVanadium1 aGeorge, J.1 aShylesh, S1 aSingh, AP  uhttps://library.ncl.res.in/content/vanadium-containing-ordered-mesoporous-silicas-synthesis-characterization-and-catalytic-002286nas a2200277   4500008004100000022001400041245015000055210006900205260008700274300001200361490000700373520120900380653001301589653001401602653001301616653003701629653003001666653002101696653002301717100002901740700002601769700002601795700002701821700002801848856013201876       2013                        eng d  a0954-008300aSynthesis and characterization of poly(ether ether ketone)s and poly(ether ether ketone ketone) s containing pendant biphenyl and naphthyl groups0 aSynthesis and characterization of polyether ether ketones and po  a1 OLIVERS YARD, 55 CITY ROAD, LONDON EC1Y 1SP, ENGLANDbSAGE PUBLICATIONS LTDcMAY  a260-2670 v253 a<p>New poly(ether ether ketone)s (PEEKs) and poly(ether ether ketone ketone)s (PEEKKs) containing pendant biphenyl and naphthyl groups were synthesized by nucleophilic substitution reaction of each of the four bisphenols viz., 1-(4- biphenylyl)- 1,1- bis(4- hydroxyphenyl) ethane, 1-(4- biphenylyl)- 1,1- bis(3- methyl, 4- hydroxyphenyl) ethane, 4,4'-[1-(2- naphthalenyl) ethylidene] bis-phenol and 4,4'-[1-(2- naphthalenyl) ethylidene] bis-3-methylphenol with 4,4'- difluorobenzophenone and 1,3- bis(4- fluorobenzoyl) benzene in a solvent mixture of N,N-dimethylacetamide and toluene in the presence of anhydrous potassium carbonate. Inherent viscosities and number-average molecular weights of polymers were in the range of 0.42-0.86 dl/g and 2.40-7.55 x 10(4), respectively. PEEKs and PEEKKs were amorphous in nature and were readily soluble in a wide range of organic solvents and could be cast into flexible and tough films from chloroform solution. Glass transition temperature of PEEKs and PEEKKs were in the range of 180 degrees C -200 degrees C. T-10 values of PEEKs and PEEKKs were in the range of 424 degrees C-512 degrees C in nitrogen atmosphere, indicating their good thermal stability.</p>10abiphenyl10abisphenol10anaphthyl10apoly(ether ether ketone ketone)s10apoly(ether ether ketone)s10aPolycondensation10aThermal properties1 aHonkhambe, Pandurang, N.1 aDhamdhere, Neelam, A.1 aTawade, Bhausaheb, V.1 aSalunkhe, Manikrao, M.1 aWadgaonkar, Prakash, P.  uhttps://library.ncl.res.in/content/synthesis-and-characterization-polyether-ether-ketones-and-polyether-ether-ketone-ketone-s-0