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Research Paper | Chemistry | India | Volume 3 Issue 3, March 2014 | Rating: 6.6 / 10
Study of Characterization and Cracking of Sucrose over supported Ni, Mo, Cu/Kieselguhr Catalyst
Tanuja Srivastava | D. C. Saxena
Abstract: Sucrose hydrogenolysis is industrially important for the production of glycerol, ethylene glycol and propylene glycol. There is a need of a catalyst providing high product yields under milder reaction conditions. Ni catalyst promoted by Mo and Cu and supported on kieselguhr was synthesized with this purpose. Ni, Mo, Cu/Kieselguhr nano catalyst prepared by simultaneous Co precipitation and digestion method on dilution showed three times higher activity than the reported earlier readings. The catalyst was characterized using the techniques of electron microscopy, X-ray diffraction and magnetic measurements. The maximum yield of glycerol and simultaneously highest conversion of sucrose with water to nickel nitrate ration of 12 was obtained. Present water and nitrates solution ratio reveals that under this condition sucrose may be hydrogenolysis to yields glycerol, ethylene glycol and propylene glycol directly instead of first producing glucose and fructose. Thus the overall picture of the hydrogenolysis of sucrose is quite complex. A large number of consecutive and parallel reactions are involved. Various routes of product formation are shown in fig. The use of suitable catalyst under appropriate conditions may produce desired mixture. Magnetic moments studies have revealed a decrease in the magnetic moment of nickel when dropped with copper. This indicates some electron transfer from copper and molybdenum to 3d band of nickel. Electron microscopy studies indicated a marked change in morphology of the kieselguhr grains. Coprecipitation of the catalyst seems to change the morphology of support particles from sharp edged particles into fibrous state. Transmission electron micrograph of unreduced catalyst shows this fibrous stage. The surface area measurement of the optimum (Ni, Mo, Cu) /kieselguhr catalyst is recorded as 789m2/g.
Keywords: catalyst, nickel, copper, Response Surface Methodology, Glycerol, Hydrogenolysis
Edition: Volume 3 Issue 3, March 2014,
Pages: 150 - 156