A modified dolomite solid base catalyst for biodiesel and its preparation method and application
A solid base catalyst, biodiesel technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of waste of resources, high cost, etc., and achieve mechanical properties Good, improved pore structure, excellent catalytic performance
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[0022] In view of this, in a specific embodiment of the present invention, a kind of preparation method of the modified dolomite solid base catalyst of biodiesel is provided, comprising:
[0023] 1) heating and calcining the dolomite after drying;
[0024] 2) immersing the calcined dolomite powder (i.e. the calcined product) in the manganese nitrate solution in step 1), stirring and drying for later use;
[0025] 3) The white solid in step 2) is pulverized, heated and calcined again, and obtained after cooling.
[0026] In yet another specific embodiment of the present invention, in step 1), the drying temperature is 105-110° C., and the drying time is 20-30 h (preferably 24 h).
[0027] In yet another specific embodiment of the present invention, in the step 1), the calcination temperature is controlled at 750-850°C (preferably 800°C), and the calcination time is 4-6h (preferably 5h).
[0028] In yet another specific embodiment of the present invention, in the step 1), the ...
Embodiment 1
[0041] Take 100g of dolomite powder and place it in a blast drying oven, and dry it at 105°C for 24 hours for later use; take the dried dolomite powder and calcinate it in a muffle furnace at 800°C for 5 hours, and obtain the calcined product after cooling for later use; weigh 0.292g of mass concentration as 50% manganese nitrate (Mn(NO 3 ) 2 4H 2 (2) solution mixes with 99.708g deionized water, stirs and configures manganese nitrate dilute solution; Take by weighing 10g calcined back dolomite mixes with above-mentioned manganese nitrate solution, after stirring (350rpm) immersion 4h, evaporate to dryness under 65 ℃ of water bath conditions, Dry at 105°C for later use; grind the impregnated product through a 200-mesh sieve, and then calcinate in a muffle furnace at 900°C for 5 hours to obtain a modified solid base catalyst with a molar ratio of Mn / Ca of 0.5:100, which is designated as sample 1.
[0042] 0.6g of catalyst, 6.263g of methanol, and 20g of palm oil were successiv...
Embodiment 2
[0044] Take 100g of dolomite powder and place it in a blast drying oven, and dry it at 105°C for 24 hours for later use; take the dried dolomite powder and calcinate it in a muffle furnace at 800°C for 5 hours, and obtain the calcined product after cooling for later use; weigh 0.583g of mass concentration as 50% manganese nitrate (Mn(NO 3 ) 2 4H 2 (2) solution mixes with 99.417g deionized water, stirs and configures manganese nitrate dilute solution; Take by weighing 10g calcined back dolomite and above-mentioned manganese nitrate solution mix, stir (350rpm) after impregnating 4h, evaporate to dryness under 65 ℃ of water-bath conditions, solvent, Dry at 105°C for later use; grind the impregnated product through a 200-mesh sieve, and then calcinate in a muffle furnace at 800°C for 5 hours to obtain a modified solid base catalyst with a Mn / Ca molar ratio of 1:100, designated as sample 2.
[0045] 0.6g of catalyst, 6.263g of methanol, and 20g of palm oil were successively added...
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