Acid-proof catalyst for preparing gamma-valerolactone from levulinic acid, preparation method and application
An acid-resistant catalyst, levulinic acid technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of long reaction time, complex process and process cost. Expensive and other problems, to achieve the effect of high product yield, good safety and simple process
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Embodiment 1～3
[0025] Catalyst preparation:
[0026] The nickel nitrate and the nitrate of the co-catalyst were prepared into a mixed solution with a certain concentration according to the composition of the catalyst (see Table 1 for the composition of the catalyst), impregnated with equal volume on the carrier alumina at room temperature, and dried in an oven at 120°C for 2 hours. After the obtained catalyst was dried, it was subjected to high-temperature treatment at 1500° C. for 3 hours to obtain the catalysts of Examples 1-3.
[0027] Preparation of γ-valerolactone by hydrogenation of levulinic acid:
[0028] Take 10ml of the catalysts of Examples 1-3, evaluate in a fixed bed, and raise the temperature from room temperature to 400°C under hydrogen at a rate of 0.5°C / min. After keeping for 5h, the temperature was lowered to the reaction temperature and the reaction was carried out. The raw material used is levulinic acid, and the reaction temperature, pressure, liquid hourly space veloc...
Embodiment 4～6
[0030] Catalyst preparation:
[0031] Copper nitrate and cocatalyst nitrate were formulated into a mixed solution according to the composition of the catalyst (see Table 1 for the composition of the catalyst), impregnated with equal volumes on the carrier alumina at room temperature, and dried in an oven at 90°C for 24 hours, and the resulting dried catalyst After high-temperature treatment at 700°C for 36 hours, the catalysts of Examples 4-6 were obtained.
[0032] Preparation of γ-valerolactone by hydrogenation of levulinic acid:
[0033] Take 10ml of the catalysts of Examples 4-6, evaluate in a fixed bed, and raise the temperature from room temperature to 300°C under hydrogen at a rate of 0.5°C / min. After keeping for 5h, the temperature was lowered to the reaction temperature and the reaction was carried out. The raw material used is levulinic acid, and the reaction temperature, pressure, space velocity and hydrogen-oil volume ratio are shown in Table 1, and the obtained ...
Embodiment 7～9
[0035] Catalyst preparation:
[0036] Mix nickel nitrate and cocatalyst nitrate according to the composition of the catalyst (see Table 1 for details of the composition of the catalyst), impregnate the same volume on the carrier chromium oxide at room temperature, dry in an oven at 100 ° C for 12 hours, and dry the obtained catalyst After high-temperature treatment at 800°C for 24 hours, the catalysts of Examples 7-9 were obtained.
[0037] Preparation of γ-valerolactone by hydrogenation of levulinic acid:
[0038] Take 10ml of the catalysts of Examples 7-9, evaluate in a fixed bed, and raise it from room temperature to 500°C under hydrogen at a rate of 0.5°C / min. After keeping for 5h, the temperature was lowered to the reaction temperature and the reaction was carried out. The raw material used is levulinic acid, and the reaction temperature, pressure, space velocity and hydrogen-oil volume ratio are shown in Table 1, and the obtained results are shown in Table 1.
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