A kind of composite metal oxide catalyst for preparing biodiesel
A composite metal, biodiesel technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, biofuels, etc., can solve the problems of large amount of catalyst and difficult separation of products, etc. Short, good reuse effect, and the effect of many catalytic active sites
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Embodiment 1
[0014] Weigh 25mmol (2.78g) of CaCl respectively 2 , 50 mmol (11.95 g) MgCl 2 ·7H 2 O and 25 mmol (6.0375 g) of AlCl 3 ·6H 2 O, dissolved in 50 mL without CO 2 Prepare a mixed salt solution in water, and at the same time weigh 187.50mmol (7.5g) NaOH and dissolve it in 100mL tap water to prepare a mixed alkali solution. Under the action of magnetic stirring, slowly add the mixed salt solution to the NaOH solution at a rate of 15mL per minute , sealed at room temperature and magnetically stirred for 6 hours, and after standing for 4 hours, a white precipitate was formed. After taking it out, the mixed solution and the precipitate were filtered with suction, and washed repeatedly with distilled water for 2 to 3 times. The solid sample was dried at 105°C to obtain the ternary species Hydrotalcite, its structural formula is: Ca 0.24 Mg 0.46 al 0.30 (OH) 2 (Cl) 0.30 0.3H 2 O The obtained ternary hydrotalcites were calcined at 700°C for 3 hours to obtain composite metal oxi...
Embodiment 2
[0017] Weigh 25mmol (5.90g) of Ca(NO 3 ) 2 4H 2 O, 50mmol (12.82g) of Mg(NO 3 ) 2 ·6H 2 O and 25mmol (9.38g) of Al(NO 33 9H 2 O, dissolved in 50mL deionized water to prepare a mixed salt solution, at the same time weigh 187.50mmol (7.5g) NaOH and dissolve it in 100mL tap water to prepare a mixed alkali solution, and slowly add the mixed salt solution to the NaOH solution under the action of magnetic stirring , the drop rate is 15mL per minute, sealed with magnetic stirring at room temperature for 6 hours, and after standing for 4 hours, a white precipitate is formed. After taking it out, the mixed solution and precipitate are filtered with suction, washed 2~3 times with distilled water, and the solid sample is kept at 105 ° C. Drying at the bottom to obtain ternary hydrotalcite, its structural formula is: Ca 0.24 Mg 0.48 al 0.28 (OH) 2 (NO 3 ) 0.28 0.4H 2 O, the obtained ternary hydrotalcite was calcined at 700°C for 3 hours to obtain the final calcium-based solid...
Embodiment 3
[0020] Weigh 25mmol (4.30g) of CaSO 4 2H 2 O, 50 mmol (12.32 g) of MgSO 47H2O and 25mmol (16.66g) of Al 2 (SO 4 ) 3 18H 2 O, dissolved in 50mL deionized water to prepare a mixed salt solution, and at the same time weigh 187.50mmol (7.5g) NaOH and dissolve it in 100mL tap water to prepare a mixed alkali solution; under the action of magnetic stirring, slowly add the mixed salt solution to the NaOH solution , the dropping rate is controlled at 15mL per minute, sealed with magnetic stirring at room temperature for 6 hours, and a white precipitate is formed after standing for 4 hours. After taking it out, the mixed solution and precipitate are filtered with suction, and washed repeatedly with distilled water for 2 to 3 times. The solid sample is kept at 105°C Drying at the bottom to obtain the ternary hydrotalcite, the structural formula is: Ca 0.24 Mg 0.44 al 0.32 (OH) 2 (SO 4 ) 0.16 0.6H 2 O, the obtained ternary hydrotalcite was calcined at 700°C for 3 hours to obta...
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