A PROCESS FOR PREPARING A HIGH SURFACE AREA (NI, W, CU)/KIESELGUHR CATALYST

摘要

This invention relates to a process of preparing a high surface area (Ni, W, Cu) / kieselguhr catalyst for hydrogenolysis and hydrogenation reaction for the production of polyols at low temperatures and pressures comprising: step 1- making a slurry of kieselguhr, nickel nitrate and cupric nitrate in water in the ratio 1:0.8 - 5.2: 0.05-0.2: 25 - 35, step 2- heating the said slurry at 60-90°C for diffusing nitrates of nickel and copper into the pores of silica in kieselguhr, step 3- preparing ammonium para & meta - tungstates by mixing 0.4 ml/gm to 17 ml/gm of tungstic acid and concentrated ammonium hydroxide and heating them at 90-110°C, step 4- adding the said ammonium para & meta tungstates to the slurry prepared in step 2 at 60-90 °C for a period of 15-90 minutes, step 5- digesting the resulting mixture of step 4 at 60-90°C for 30-90 minutes for diffusing ammonium para & meta tungstates into the pores of silica in kieselguhr, step 6- adding aqueous solution of sodium carbonate to step 5 and digesting the resulting slurry for 60-120 minutes at 70-110°C to precipitate carbonates and hydroxides of nickel and copper as well as oxides of tungsten, step 7- filtering, washing and drying the said precipitate under vacuum to form the catalyst, and step 8- reducing the said catalyst with hydrogen at temperature 500-700°C to convert carbonates and hydroxides of nickel and copper into nickel and copper and oxides of tungsten into tungsten which partly dissolves in nickel thereby altering its electronic configuration