A kind of method of synthesizing gamma-valerolactone by catalytic hydrogenation
A technology of valerolactone and cobalt catalysts, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxides/metal hydroxide catalysts, etc., and can solve the problems of expensive and high production costs of noble metal catalysts, Achieve low cost, high activity and stability, and good selectivity
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Embodiment 1
[0033] Preparation of catalyst by impregnation method:
[0034] 1) Pretreatment of the carrier, 1gSiO 2 The carrier is calcined at 500°C for 3 hours;
[0035] 2) Load the active components, set the cobalt load to 15%, and calculate the required Co(NO 3 ) 2 ·6H 2 The theoretical amount of O is 0.74g, and 0.74g of Co(NO 3 ) 2 ·6H 2 O was dissolved in 5 mL of water to obtain an aqueous solution of cobalt nitrate. The carrier pretreated in step 1) was completely immersed in the aqueous solution of cobalt nitrate and immersed at 20°C for 12 hours, then all the solution and SiO 2 Dry at 110°C for 12 hours, calcinate at 500°C for 4 hours, and finally reduce in hydrogen atmosphere at 500°C for 3 hours to obtain Co / SiO with 15% loading 2 Catalyst 1.15g.
[0036] 3) Add 0.3 grams of Co / SiO 2 The catalyst, 1.7 g of levulinic acid, and 40 mL of solvent methanol were added to the autoclave. The reaction temperature was 140°C. The air in the autoclave was replaced by hydrogen and the hydrogen press...
Embodiment 2
[0038] Other operations are the same as in Example 1, except that the solvent in step 3) is 40 mL of water, the reaction time is 6 hours, the conversion rate of levulinic acid detected by gas chromatography is 100%, and the yield of γ-valerolactone is 99.9% .
Embodiment 3
[0040] The catalyst preparation process 1) and 2) are the same as in Example 1, except that the catalyst uses γ-Al 2 O 3 As a carrier, Co / γ-Al with a loading amount of 15% was prepared 2 O 3 catalyst.
[0041] 3) Add 0.3 g Co / γ-Al 2 O 3 The catalyst was added to a 100 ml autoclave, other conditions were the same as in Example 1, the reaction time was 6 hours, the conversion rate of levulinic acid detected by gas chromatography was 100%, and the yield of γ-valerolactone was 80.4%.
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