Catalyst for preparing gamma-valerolactone from alpha-angelica lactone, and preparation method and application thereof
A technology of angelica lactone and catalyst, which is applied in the catalyst, preparation method and application field of preparing gamma-valerolactone from alpha-angelica lactone, can solve the problems of long reaction time, complex process, many by-products, etc., and achieve The effect of high product yield, good safety and easy operation
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Embodiment 1
[0025] Adopt the precipitation method to prepare the catalyst with zinc oxide as the carrier, according to the catalyst composition, the nitrate and zinc nitrate of the active component, the cocatalyst are made into a mixed solution (the composition of the catalyst is shown in Table 1), and the mixture is mixed with sodium carbonate lye. Precipitation, the reaction temperature is 50°C, and the pH is controlled at around 9.0. After the feeding is completed, it is aged at the reaction temperature for 1 hour, filtered and washed 5 times. The obtained filter cake was dried in an oven at 90° C. for 24 hours, and then calcined at 350° C. for 24 hours to obtain the catalyst of Example 1. The process conditions and results of hydrogenation of α-angelica lactone to prepare γ-valerolactone are shown in Table 1.
Embodiment 2
[0027] Adopt the precipitation method to prepare the catalyst with zinc oxide as the carrier, according to the catalyst composition, the nitrate and zinc nitrate of the active component, the promoter are made into a mixed solution (the composition of the catalyst is shown in Table 1), and the ammonium carbonate lye is added dropwise to In the prepared nitrate mixed solution, the reaction temperature is 90°C, and the pH is controlled at about 6.0. After the feeding is completed, it is aged at the reaction temperature for 1 hour, filtered and washed 3 times. The obtained filter cake was dried in an oven at 120° C. for 2 hours, and then calcined at 600° C. for 2 hours to obtain the catalyst of Example 2. The process conditions and results of hydrogenation of α-angelica lactone to prepare γ-valerolactone are shown in Table 1.
Embodiment 3
[0029] Adopt the precipitation method to prepare the catalyst with zinc oxide as the carrier, add the mixed solution of the active component, the nitrate of the cocatalyst and the zinc nitrate (the composition of the catalyst is shown in Table 1) dropwise in the sodium carbonate lye, react The temperature is 80°C, and the pH is controlled at about 7.0. After the feeding is completed, it is aged at the reaction temperature for 1 hour, filtered and washed 5 times. The obtained filter cake was dried in an oven at 100° C. for 12 hours, and then calcined at 500° C. for 5 hours to obtain the catalyst of Example 3. The process conditions and results of hydrogenation of α-angelica lactone to prepare γ-valerolactone are shown in Table 1.
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