Potassium fluoride,anhydrous
           Potassium fluoride,extra pure
           Potassium fluoride,Granular
           Silicon Dioxide
           Hydrofluoric acid
           Synthetic Cryolite
           Potassium Fluoaluminate
           Ammonium bifluoride
           Potassium Bifluoride
           Aluminium fluoride
           Sodium fluoride
           Potassium Fluorosilicate
           Fluorosilicic Acid
           Sodium silicofluoride
           Potassium Hydroxide Flakes
           Magnesium Fluoride
           Magnesium fluorosilicate
           Barium Fluoride
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(1) Ni-Al hydrotalcite was prepared by coprecipitation method, and nickel-aluminum composite oxide was prepared by calcination at high temperature. The potassium fluoride and nickel-aluminum composite oxide were ground together and dried to prepare potassium fluoride /nickel-aluminum composite oxide. The molar ratio of nickel to aluminum was 2, the calcination temperature was 550 ℃, the calcination time was 2h, and the mass ratio of potassium fluoride /nickel aluminum composite oxide was 1. The optimum conditions for the preparation of catalyst were obtained by orthogonal experiment.

(2) The potassium fluoride /nickel-aluminum composite oxide prepared under the optimized conditions catalyzed the transesterification reaction of castor oil with methanol. As a result, the conversion rate of castor oil was 98.9%.

(3) The Ni-Al hydrotalcite, nickel-aluminum composite oxide and potassium fluoride /nickel-aluminum composite oxide catalysts prepared under optimized conditions were characterized by TG-DTA, FTIR, BET and XRD. The results show that nickel The hydrothermal talc has three weight loss steps in the temperature range of 30 ~ 220 ℃, 220 ~ 380 ℃ and 500 ~ 520 ℃. The BET surface area of the potassium fluoride /nickel aluminum compound oxide catalyst is 34.42m2 /g, the accumulated pore volume of BJH Is 0.128cm3 /g and the average pore radius of BJH is 5.46nm. The potassium fluoride /nickel-aluminum composite oxide catalyst is composed of NiO crystal doped with aluminum atom, K3AlF6 crystal and amorphous material. It is presumed that KOH Play a major catalytic role.