Composite solid alkaline catalyst and application for preparing biodiesel by catalyzing ester exchange
A solid base catalyst, biodiesel technology, applied in heterogeneous catalyst chemical elements, physical/chemical process catalysts, biofuels, etc., can solve the problems of long reaction time, high reaction temperature, etc., and achieve simple processing technology and preparation technology. Simple, less saponification by-products
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Embodiment 1
[0017] Embodiment 1 uses alumina as a carrier, adopts the impregnation method, according to the loading capacity of Na 4%, the loading capacity of Ba 0.6% (both in carrier), 8.5g of alumina and 11mL of hexametaphosphoric acid with a mass fraction of 3.1% Immerse in sodium aqueous solution for 6 hours, dry at 105°C for 2 hours after impregnation, then impregnate with 10.5mL of 0.5% barium chloride aqueous solution for 8 hours, dry at 105°C for 6 hours after impregnation, and then bake at 500°C for 4 hours, A 4% Na-0.6% Ba / alumina catalyst was obtained.
Embodiment 2
[0019] Using magnesium oxide as a carrier, adopting the impregnation method, according to the loading capacity of Na 5%, the loading capacity of Ba 0.3%, and the loading capacity of Ce 0.1% (both based on the carrier), the mass fraction of 12.1g magnesium oxide and 10.6mL is 5.8%. Immerse in sodium hexametaphosphate aqueous solution for 5 hours, dry at 105°C for 2 hours after impregnation, then impregnate with 1.9mL of 2% barium chloride and 6.6mL of 0.2% cerium sulfate aqueous solution for 10 hours, and then 80°C after impregnation Drying for 10 hours, followed by calcination at 550° C. for 3 hours, yielded a 5% Na-0.3% Ba-0.1% Ce / MgO catalyst.
Embodiment 3
[0021] Using zirconium dioxide as a carrier, using the impregnation method, according to the loading of 8% of K and 0.1% of Ce (both based on the carrier), 10.6g of zirconium dioxide and 8.6mL of mass fraction of 10% potassium carbonate aqueous solution were impregnated for 10 Hours, after impregnation, dry at 105°C for 3 hours, then impregnate with 5.5mL mass fraction of 0.2% cerium sulfate aqueous solution for 10 hours, dry at 80°C for 12 hours after impregnation, and then roast at 550°C for 4 hours to obtain 8% Na- 0.1% Ce / zirconia catalyst.
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