02005nas a2200193   4500008004100000022001400041245007000055210006900125260011000194300001400304490000600318520126000324100002101584700002101605700003201626700001901658700003301677856010101710       2012                        eng d  a2044-475300aConversion of cellulose to polyols over promoted nickel catalysts0 aConversion of cellulose to polyols over promoted nickel catalyst  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcMAY  a1852-18580 v23 a<p>Sorbitol is one of the key platform chemicals that can be applied to several industrial applications, including bio-fuels and hydrogen production. Presently there is no commercial heterogeneous catalytic process to produce sorbitol from cellulose due to the low yield and high cost of noble metals required for the conversion. In this paper we describe an aqueous phase hydrolysis-hydrogenation process to convert cellulose to sorbitol using a cheap Ni based catalyst. Monometallic Ni catalysts showed little activity for the reaction, but with the addition of a small amount of Pt to the Ni catalyst (Ni : Pt = 22 : 1 atom ratio), the activity was greatly enhanced. Results showed that the bimetallic Ni-Pt catalysts supported on mesoporous alumina gave a hexitol (sorbitol + mannitol) yield of 32.4% compared to only 5% with a Ni catalyst. Moreover, Ni-Pt supported on a mesoporous beta zeolite support provided even higher yield of 36.6%. These results were obtained after only 6 hours of run at 200 degrees C and 50 bar H-2 pressure (at room temperature). The presence of a small amount of Pt promotes the protonation of water and hydrogen molecules, which spill over to Ni sites creating in situ acid sites to catalyse hydrolysis of cellulose.</p>1 aShrotri, Abhijit1 aTanksale, Akshat1 aBeltramini, Jorge, Norberto1 aGurav, Hanmant1 aChilukuri, Satyanarayana, V.  uhttps://library.ncl.res.in/content/conversion-cellulose-polyols-over-promoted-nickel-catalysts-002139nas a2200241   4500008004100000022001100041245012700052210007100179260000900250300001000259490000800269520128500277653001801562653001701580653003901597653002001636100001901656700001801675700001801693700001901711700003301730856013401763       2018                        eng d  a21951700aTuning the dimensionality of layered Srn+1Tin−xNixO3n+1 perovskite structures for improved activity in syngas generation0 aTuning the dimensionality of layered Srn1Tin−xNixO3n1 perovskite  cAPR   a27-390 v3603 a<p>Interest in perovskite type oxides is growing due to their versatile catalytic applications. A series of Ruddlesden-Popper (RP) type layered perovskite oxides Srn+1Tin−xNixO3n+1 were prepared and evaluated for their catalytic activity in steam reforming, CO2 reforming and bi-reforming of methane. These materials, prepared through citrate gel method were characterized to understand their structure and Ni reducibility. Substitution of Ni in RP phases was established through refinement of XRD powder pattern. During methane reforming, the catalytic activity increased with the order of RP phase of SrTi1−xNixO3−δ (n = ∞). TPR results show variation in Ni reducibility with the order of RP phase, while TPD-O2 study helped to estimate oxygen vacancies. These vacancies seem to influence catalytic activity during methane reforming. Transient pulse experiments show that CO2 dissociates over oxygen vacancies to give CO and oxygen, with later replenishing lattice oxygen in SrTi0.8Ni0.2O3−δ (n = ∞) phases. Highly labile oxygen vacancies generated in the bulk of SrTi0.8Ni0.2O3−δ must be migrating to the surface, helping in the removal of coke formed. Characterization of catalysts after reaction helped in better understanding of coke precursors.</p>10aDry reforming10aNickelSyngas10aRuddlesden-Popper (RP) perovskites10aSteam reforming1 aDama, Srikanth1 aGhodke, Seema1 aBobade, Richa1 aGurav, Hanmant1 aChilukuri, Satyanarayana, V.  uhttps://library.ncl.res.in/content/tuning-dimensionality-layered-srn1tin%E2%88%92xnixo3n1-perovskite-structures-improved-activity