01646nas a2200277   4500008004100000022001400041245008400055210006900139260005700208300001200265490000800277520071600285653000601001653001801007653002401025653001301049653002901062100002101091700002101112700002501133700002801158700002301186700002101209700002901230856010901259       2010                        eng d  a1011-372X00aCu:Al Nano catalyst for selective hydrogenolysis of glycerol to 1,2-propanediol0 aCuAl Nano catalyst for selective hydrogenolysis of glycerol to 1  a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcMAR  a141-1470 v1353 a<p>Non-chromium Cu:Al nano catalyst prepared by simultaneous co-precipitation and digestion method without any template or stabilizer, showed three times higher activity than the bulk Cu-Cr catalyst for hydrogenolysis of glycerol in both isopropanol and water solvents, with the selectivity to 1,2-Propanediol (1,2-PDO) as high as 91% at 493 K and H(2) pressure of 7 MPa in 5 h. XRD pattern showed the presence of Cu(+) species in the activated Cu: Al nano catalyst. Although Cu(+) is catalytically inactive in glycerol hydrogenolysis reaction, the presence of Cu(+) helps to stabilize the particle size in a narrow range of 7-11 nm by inhibiting the sintering of copper particles under reaction conditions.</p>10a110a2-Propanediol10aCu:Al nano catalyst10aGlycerol10aSelective hydrogenolysis1 aMane, Rasika, B.1 aHengne, Amol, M.1 aGhalwadkar, Ajay, A.1 aVijayanand, Subramanian1 aMohite, Pravin, H.1 aPotdar, Hari, S.1 aRode, Chandrashekhar, V.  uhttps://library.ncl.res.in/content/cual-nano-catalyst-selective-hydrogenolysis-glycerol-12-propanediol-001649nas a2200157   4500008004100000022001400041245012600055210006900181260007100250300001400321490000700335520097300342100002101315700002901336856012601365       2012                        eng d  a1083-616000aContinuous dehydration and hydrogenolysis of glycerol over non-chromium copper catalyst: laboratory-scale process studies0 aContinuous dehydration and hydrogenolysis of glycerol over nonch  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAY  a1043-10520 v163 a<p>A non-chromium Cu:Al catalyst was developed for glycerol dehydration under N-2 atmosphere to acetol and hydrogenolysis to 1,2-propanediol (1,2-PDO). Among the various copper-based catalysts screened in this work, Cu:Al-1 catalyst showed the highest activity and acetol selectivity in water medium, whereas transfer hydrogenation in 2-propanol as the reaction medium led to the formation of 1,2-PDO (10-38%). The same catalyst was also found to catalyze the direct hydrogenolysis of glycerol to 1,2-PDO. Time on stream activity (TOS) of our Cu:Al-1 catalyst for both continuous dehydration and hydrogenolysis of glycerol was found to be 400 h with an average glycerol conversion of 90% and 65%, respectively. Maximum acetol selectivity was 55% while 1,2-PDO selectivity was 91% in dehydration and hydrogenolysis reactions separately. Effects of various reaction conditions on conversion, selectivity, and global rates of the two processes were also investigated.</p>1 aMane, Rasika, B.1 aRode, Chandrashekhar, V.  uhttps://library.ncl.res.in/content/continuous-dehydration-and-hydrogenolysis-glycerol-over-non-chromium-copper-catalyst-001610nas a2200193   4500008004100000022001400041245014000055210006900195260007100264300001600335490000700351520080300358100002101161700002301182700002801205700002501233700002901258856012901287       2012                        eng d  a0888-588500aSelectivity tuning options in hydrogenation of m-chloronitrobenzene to m-chloroaniline over mono- and bimetallic supported Pt catalysts0 aSelectivity tuning options in hydrogenation of mchloronitrobenze  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcDEC  a15564-155720 v513 a<p>Supported monometallic (Pt, Ni,) and bimetallic (Ni-Pt) catalysts were prepared for the selective liquid phase hydrogenation of m-chlronitrobenzene to m-chloroaniline (m-CAN). It was found that the use of sodium carbonate as an additive substantially reduced the extent of dehydrohalogenation in the case of monometallic, 1% Pt/C catalyst, to give the highest selectivity of 96% to m-CAN. Ni-Pt bimetallic catalyst although showed almost complete selectivity (&gt;99%) to m-chloroaniline; its activity was several fold lower than that of 1% Pt/C Na2CO3 system. However, compared with Ni monometallic catalyst, bimetallic Ni-Pt showed higher activity and selectivity due to the presence of electron rich surface metallic Pt stabilized by Ni having lower ionization potential compared with Pt.</p>1 aMane, Rasika, B.1 aPotdar, Aparna, S.1 aNadgeri, Jayprakash, M.1 aBiradar, Narayan, S.1 aRode, Chandrashekhar, V.  uhttps://library.ncl.res.in/content/selectivity-tuning-options-hydrogenation-m-chloronitrobenzene-m-chloroaniline-over-mono-001667nas a2200157   4500008004100000022001400041245010800055210006900163260011000232300001400342490000700356520096800363100002101331700002901352856012801381       2012                        eng d  a1463-926200aSimultaneous glycerol dehydration and in situ hydrogenolysis over Cu-Al oxide under an inert atmosphere0 aSimultaneous glycerol dehydration and in situ hydrogenolysis ove  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJUL  a2780-27890 v143 a<p>Among various catalysts screened, the Cu-Al oxide catalyst, prepared by a co-precipitation method, exhibited excellent activity for simultaneous glycerol dehydration and its hydrogenolysis without external hydrogen. Detailed characterization by XRD, XPS, HR-TEM, TPR, etc., showed evidence of Cu2+ in the form of CuO and CuAl2O4, along with Cu-0 and Cu1+ species, which are responsible for their multifunctional roles in glycerol APR, dehydration and hydrogenolysis reactions under inert conditions. This catalyst also presented consistent activity for a duration of 400 h for autogeneous hydrogenolysis of refined glycerol with 36% selectivity to 1,2-propanediol (1,2-PDO). Manipulating the temperature and feed flow rate conditions, meant that the selectivity to acetol and 1,2-PDO could be tailored as desired. Substantial enhancement in 1,2-PDO selectivity (75%) was achieved for an aqueous bio-glycerol feed over the same catalyst for 50 h of testing.</p>1 aMane, Rasika, B.1 aRode, Chandrashekhar, V.  uhttps://library.ncl.res.in/content/simultaneous-glycerol-dehydration-and-situ-hydrogenolysis-over-cu-al-oxide-under-inert-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-002129nas a2200253   4500008004100000022001400041245012800055210006900183260007700252300001400329490000600343520121900349653001301568653001101581653001501592653001301607653001401620100002101634700002001655700002501675700001901700700002901719856012701748       2014                        eng d  a1867-388000aEffect of composition and pretreatment parameters on activity and stability of Cu-Al catalysts for water-gas shift reaction0 aEffect of composition and pretreatment parameters on activity an  aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcJUN  a1698-17060 v63 a<p>We investigated various Cu species responsible for highly efficient Cu-Al oxide catalyst for the water-gas shift reaction (WGSR). The formation of various Cu species was achieved by systematically varying the Cu-Al composition in the coprecipitated mixed Cu-Al oxides. The Cu-Al composition of 70:30 (Cu-Al-7) was the best for WGSR using the reformate gas composition. In addition, the Cu-Al-7 catalyst reduced under 100% H-2, was relatively stable with time on stream of 100 h, at higher gas hourly space velocity of 36201 h(-1). The structural investigation of our coprecipitated catalysts with varying Cu-Al compositions revealed the formation of nonzero oxidation state copper and metallic Cu to be essential for the observed WGSR activity. In addition, the highest activity and stability of Cu-Al-7 catalysts reduced under 100% H-2 at lower temperature was attributed to particle-size stabilization and a lower extent of Cu aggregation by Cu2O and boehmite phases, respectively, along with the formation of various Cu species during the activation protocol for 12 h. Complete CO2 selectivity without methanation was observed for all the Cu-Al compositions irrespective of their pretreatment conditions.</p>10aaluminum10aCopper10afuel cells10aHydrogen10areduction1 aMane, Rasika, B.1 aJeong, Dae-Woon1 aMalawadkar, Atul, V.1 aRoh, Hyun-Seog1 aRode, Chandrashekhar, V.  uhttps://library.ncl.res.in/content/effect-composition-and-pretreatment-parameters-activity-and-stability-cu-al-catalysts-002623nas a2200409   4500008004100000022001400041245012500055210006900180260000800249490000800257520131500265653002101580653002101601653001401622653001301636653002501649653002801674653002401702653002201726653001901748653001501767653002301782653001801805653002601823653001701849653001301866653002501879653003101904653002201935653002301957100002101980700001402001700002102015700002402036700002902060856012402089       2017                        eng d  a0926-337300aInfluence of carbon based supports on selectivity behavior of diols and propanol in Ru catalyzed glycerol hydrogenolysis0 aInfluence of carbon based supports on selectivity behavior of di  cMAY0 v2043 a<p>Activated carbon (AC) and three graphite materials were studied as supports for Ru catalyzed glycerol hydrogenolysis to propanediols and 1-propanol. Structural characteristics of AC and graphite materials were found to greatly affect the reducibility and particle size of supported Ru and hence, the activity and product distribution in glycerol hydrogenolysis. XRD of graphite materials showed distinctly (002) plane having highly organized layered structure and the peak intensity decreased in the order of Ru/KS150 &gt; Ru/HSAG100 &gt; Ru/KS6 due to decrease in the graphite sheet thickness. In Raman, the intense D band in HSAG100 compared to that in KS6 and KS150 samples indicated its highly amorphous nature or mixed carbon hybridization. Glycerol conversion for Ru on AC was higher than that on graphite and among different graphites, it showed a descending activity order of Ru/KS6 &gt; Ru/HSAG100 &gt; Ru/KS150. The product distribution for AC and HSAG100 supported Ru was similar, giving 1-propanol (45%) alongwith 1,2-propanediol (1,2-PDO) (37%) and 1,3-propanediol (1,3-PDO) (9–11%). For graphite supports, availability of Ru although bigger in size (4–5 nm), would be higher on the surface than in case of AC which formed deep hydrogenolysis products like 1-, 2- propanol, ethanol etc.</p>10aactivated carbon10aAmorphous carbon10acatalysis10aGlycerol10aGlycerol conversions10aGlycerol hydrogenolysis10agraphite composites10aGraphite supports10aHydrogenolysis10aHydrolysis10alayered structures10aParticle size10aProduct distributions10aPropanediols10aPropanol10aSelectivity behavior10aStructural characteristics10aStructural effect10aStructural effects1 aMane, Rasika, B.1 aPatil, S.1 aShirai, Masayuki1 aRayalu, Sadhana, S.1 aRode, Chandrashekhar, V.  uhttps://library.ncl.res.in/content/influence-carbon-based-supports-selectivity-behavior-diols-and-propanol-ru-catalyzed01578nas a2200193   4500008004100000245018700041210006900228260000800297300001400305490000700319520079000326100002201116700002101138700002501159700002701184700001601211700002501227856013201252       2017                        eng d00aMicrowave-assisted synthesis of 5-substituted 1H-tetrazoles via [3+2] cycloaddition over a heterogeneous Cu-based catalyst: application to the preparation of N-13-labelled tetrazoles0 aMicrowaveassisted synthesis of 5substituted 1Htetrazoles via 32   cAUG  a8084-80910 v413 aThe [3+2] cycloaddition between various nitriles and sodium azide proceeds smoothly in the presence of a new Cu-II catalyst in N-methyl-2-pyrrolidone (NMP) to give the corresponding 5-substituted 1H-tetrazoles. The desired tetrazoles were obtained in high yields within 3-30 min by employing controlled microwave heating. The reaction most probably proceeds through the activation of the nitrile groups by the Cu-II species, followed by a successive [3+2] cycloaddition with the sodium azide. The good performance of the catalyst enabled the preparation of selected tetrazoles labelled with the positron emitter nitrogen-13 even under conventional heating. The short reaction time, simple work-up procedure, and recyclability of the catalyst are advantages of the method reported here.1 aJoshi, Sameer, M.1 aMane, Rasika, B.1 aPulagam, Krishna, R.1 aGomez-Vallejo, Vanessa1 aLlop, Jordi1 aRode, Chandrashekhar  uhttps://library.ncl.res.in/content/microwave-assisted-synthesis-5-substituted-1h-tetrazoles-32-cycloaddition-over-heterogeneous