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-0