01860nas a2200253   4500008004100000022001400041245012300055210006900178260007300247300001200320490000600332520095300338653001501291653001501306653001101321653002401332653002301356653002801379100001901407700001701426700001701443700001801460856012801478       2005                        eng d  a1566-736700aInfluence of alkali metal doping on selectivity behaviour of platinum catalysts for hydrogenation of 2-butyne-1,4-diol0 aInfluence of alkali metal doping on selectivity behaviour of pla  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcNOV  a725-7300 v63 a<p>Hydrogenation of 2-butyne-1,4-diol to 2-butene-1,4-diol (B(2)D) and butane-1,4-diol (B(1)D) using Pt catalysts doped with alkali metals was studied. These catalysts showed higher selectivity to the olefinic diol (B2D) compared to that with monometallic platinum catalyst. Among various alkali metals, Cs-doped catalyst showed highest selectivity (&gt;99%) to B(2)D. The selectivity to B(2)D increased (up to 99.9%) with increase in the concentration of Cs from 0.25% to 1%. The increase in the basic strength of alkali doped catalysts measured by CO(2)-TPD, would be responsible for the increase in electron density of Pt hence, faster desorption and higher selectivity to the intermediate olefinic diol (B(2)D). The reaction parameters; such as temperature, H(2) pressure and substrate concentration haye strong influence on the catalyst activity but almost no effect on the selectivity to B(2)D. (c) 2005 Elsevier B.V. All rights reserved.</p>10a2-butene-110a2-butyne-110a4-diol10aalkali metal doping10aplatinum catalysts10aSelective hydrogenation1 aTelkar, M., M.1 aRode, C., V.1 aRane, V., H.1 aChaudhari, R.  uhttps://library.ncl.res.in/content/influence-alkali-metal-doping-selectivity-behaviour-platinum-catalysts-hydrogenation-2-001482nas a2200265   4500008004100000022001400041245011200055210006900167260007300236300001000309490000800319520051300327653002400840653002800864653002100892653002300913653002800936653002100964653002600985100001901011700002001030700001701050700001801067856013101085       2005                        eng d  a0926-860X00aRole of a co-metal in bimetallic Ni-Pt catalyst for hydrogenation of m-dinitrobenzene to m-phenylenediamine0 aRole of a cometal in bimetallic NiPt catalyst for hydrogenation   aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcOCT  a23-300 v2953 a<p>Bimetallic Ni-Pt catalysts supported on carbon were found to give very high turn over frequency numbers and almost complete selectivity to m-phenylenediamine in m-dinitrobenzene hydrogenation as compared to the monometallic nickel catalysts. The XRD and XPS characterization revealed that most of the nickel remains as Ni2+ in a monometallic catalyst while, the addition of platinum leads to the stabilization of Ni-0 state, in case of bimetallic catalysts. (c) 2005 Elsevier B.V. All rights reserved.</p>10aBimetallic catalyst10aCatalytic hydrogenation10am-dinitrobenzene10am-phenylenediamine10aSelective hydrogenation10aturn over number10aXPS and XRD of nickel1 aTelkar, M., M.1 aNadgeri, J., M.1 aRode, C., V.1 aChaudhari, R.  uhttps://library.ncl.res.in/content/role-co-metal-bimetallic-ni-pt-catalyst-hydrogenation-m-dinitrobenzene-m-phenylenediamine-001579nas a2200253   4500008004100000022001400041245008900055210006900144260007300213300001200286490000600298520067400304653001500978653002800993653002301021653002801044653002101072653002201093653003101115100002001146700001901166700001701185856012301202       2008                        eng d  a1566-736700aHydrogenation activity and selectivity behavior of supported palladium nanoparticles0 aHydrogenation activity and selectivity behavior of supported pal  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAR  a441-4460 v93 a<p>Enhancement in activity and selectivity of catalytic hydrogenation using supported nanosize palladium catalyst has been investigated. Pd/C catalyst prepared in the presence of polyvinyl pyrrolidone (PVP) as a stabilizer gave Pd particle size in a narrow range of 3-5 nm. While, evaluating for hydrogenation of 2-butyne-1,4-diol, the rate enhancement was found to be 10 times higher as compared to the conventional (bulk) Pd catalysts. A proper choice of stabilizer (PVP) giving small particle size as well as highly dispersed nature of nano particles were the major factors for such a dramatic enhancement of activity. (c) 2007 Elsevier B.V. All rights reserved.</p>10abutynediol10aCatalytic hydrogenation10ananosize palladium10aSelective hydrogenation10aSEM-EDX analysis10asize distribution10asupported Pd nanoparticles1 aNadgeri, J., M.1 aTelkar, M., M.1 aRode, C., V.  uhttps://library.ncl.res.in/content/hydrogenation-activity-and-selectivity-behavior-supported-palladium-nanoparticles-0