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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Preparation of Potassium Fluoride /Ni - Al Composite Oxide Catalyst: 0.02 mol of aluminum nitrate and the corresponding amount of nickel nitrate were weighed according to the nickel /aluminum molar ratio (2: 1, 3: 1, 4: 1) determined by orthogonal experiment, Bottle, add 50mL of distilled water dissolved solution A; weighed 0.16mol sodium hydroxide, 0.04mol sodium carbonate, into another 250mL Erlenmeyer flask, add 75mL of distilled water dissolved solution B. The solution A and the solution B were respectively charged into two constant pressure dropping funnel, the stirrer was opened, the constant precipitation reaction temperature was 65 ℃, the dropping rate of the control solution A was 2 to 3 drops / s, and the two constant pressure. The dropping rate of the dropping funnel stabilized the pH at 7 to 9, and the mixture was stirred for 6 hours. The precipitate mixture was transferred to a conical flask and placed in a constant temperature water bath at 90 ° C for 12 h, then filtered and washed until the pH of the filtrate was about 7. The filter cake into a vacuum oven, dried at 80 ℃ for 10h, that was nickel-aluminum hydrotalcite. The nickel-aluminum hydrotalcite is calcined at a certain temperature (450,500, 550 ℃) for a certain time (2,4,6h) to obtain nickel-aluminum composite oxide. According to a certain potassium fluoride /nickel-aluminum composite oxide mass ratio (0.5,1.0,1.5), weighed potassium fluoride and nickel-aluminum composite oxide mixed in the mortar grinding, into a vacuum oven at 100 ℃ Drying 10h, that was potassium fluoride / nickel-aluminum composite oxide catalyst.