Hydrogenation catalyst suitable for producing biodiesel, preparation method and application thereof
A hydrogenation catalyst, biodiesel technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve low selectivity, high reaction temperature, low heterogeneity To achieve the effect of improving surface acidity, uniform temperature distribution and lowering the freezing point
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[0054] 1, the preparation method of graphite oxide, concrete steps are as follows:
[0055] 101) Weighing 1g of natural graphite, 1g of anhydrous sodium nitrate and 50ml of concentrated sulfuric acid with a mass fraction ≥ 75%;
[0056] 102) Slowly put natural graphite and anhydrous sodium nitrate into concentrated sulfuric acid placed in an ice bath, slowly add 6 g of potassium permanganate for oxidation treatment, and stir for 0.5-2 hours to obtain a mixed solution;
[0057] 103) Place the mixed solution in a water bath at a temperature of 35° C., stir for 2 hours, and slowly add 200 ml of deionized water to the mixed solution during the stirring process;
[0058] 104) Then place the mixed solution in an oil bath with a temperature of 98° C., continue to stir and react for 0.5 h, then dilute the mixed solution with deionized water to 400 ml to obtain a diluted solution;
[0059] 105) Slowly add 30ml of hydrogen peroxide with a mass fraction of 30% to the diluted solution, a...
Embodiment 1
[0073] The preparation method of the carrier ①, the specific steps are as follows:
[0074] 1) Take by weighing 0.7g of molecular sieve graphene composite material, 4.8g of amorphous silicon aluminum, 2.5g of macroporous alumina and 0.1g of kale powder;
[0075] 2) macroporous alumina, amorphous silica-alumina, molecular sieve graphene composite material and squat powder were mixed in a kneader for 15 minutes to obtain a mixture;
[0076] 3) Weighing 2g of small-pore alumina and 6g of nitric acid solution with a mass fraction of 4% and mixing them uniformly as a binder;
[0077] 4) Add 8g of adhesive to the obtained mixture, knead for 30min, transfer to extruder for extrusion molding, then freeze-dry it for 20h, and cut into pellets;
[0078] 5) Place the freeze-dried mixture of molded pellets in an air atmosphere, then bake at 500°C for 4 hours and then cool to room temperature to make a carrier ①;
[0079] The preparation method of selective hydrogenation catalyst ①, concr...
Embodiment 2
[0083] The preparation method of carrier ②, concrete steps are as follows:
[0084] 1) Take by weighing 1.0g of molecular sieve graphene composite material, 5.0g of amorphous silica-alumina, 2.0g of macroporous alumina and 0.1g of squash powder;
[0085] 2) macroporous alumina, amorphous silica-alumina, molecular sieve graphene composite material and squat powder were mixed in a kneader for 15 minutes to obtain a mixture;
[0086] 3) Weighing 2g of small-pore alumina and 6g of nitric acid solution with a mass fraction of 4% and mixing them uniformly as a binder;
[0087] 4) Add 8g of adhesive to the obtained mixture, knead for 30min, transfer to extruder for extrusion molding, then freeze-dry it for 20h, and cut into pellets;
[0088]5) Place the freeze-dried mixture of molded pellets in an air atmosphere, then bake at 500°C for 4 hours and then cool to room temperature to make a carrier ②;
[0089] The preparation method of selective hydrogenation catalyst ②, concrete steps...
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