Catalyst for decarboxylation of levulinic acid, preparation method of catalyst, and method for preparing butanone through selective decarboxylation of levulinic acid
A technology of levulinic acid and catalyst, which is applied in the direction of catalyst activation/preparation, molecular sieve catalyst, and carbon-based compound preparation. It can solve the problems of low product yield and difficult recovery, and achieve high yield, high catalytic efficiency, and simple treatment. Effect
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Embodiment 1
[0047] Catalyst preparation: the carrier (SAPO-11 molecular sieve, SAPO-34 molecular sieve, HY molecular sieve, H-β molecular sieve, H-USY molecular sieve, MCM-22 molecular sieve, MCM-41 molecular sieve, SBA-15 molecular sieve, H-ZSM-5 molecular sieve and silica gel) placed in a muffle furnace, heated from room temperature at 8-15°C / min to 350-500°C, kept for 1-5 hours for thermal activation treatment, taken out after cooling down, and passed through a 100-mesh sieve Sieve, and take by weighing the porous material carrier after the above-mentioned activation treatment of 1g in the 25ml beaker for subsequent use; According to the ratio of CuO and PbO in the embodiment and the loading capacity calculation on the carrier and weigh the precursor salt Cu(NO 3 ) 2 ·3H 2 O and PbCl 2 Place in a 25ml round bottom flask, add 4-20ml of ultra-pure water, and stir evenly in an oil bath at 90-150°C. After it is completely dissolved, pour the metal precursor salt solution drop by drop int...
Embodiment 2
[0049] Weigh 0.15g of levulinic acid into a 50mL beaker, dissolve it with ultrapure water, adjust its pH value to 5-6 with NaOH solution, and prepare 25ml of levulinic acid reaction solution. Weigh 0.03g of supported copper-based composite catalyst CuO-PbO(28:12) / H-β into a 50ml autoclave, and then add the above-mentioned levulinic acid reaction solution. Afterwards, the reactor was sealed, and the N 2 Replace the air in the reactor with air, set the stirring speed to 400r / min, turn on the condensed water, the heating program is to raise the temperature from room temperature to 280°C after 40min, and keep it for 1h. Condensate, sampled and pretreated. Using Waters high performance liquid chromatography (model Waters Alliance 2695 HPLC, HPX-87H chromatographic column) for quantitative analysis of raw materials and products, the conversion rate of levulinic acid was 93.56%, and the yield of butanone was 76.48%.
[0050] Catalyst preparation parameters: carrier activation tempe...
Embodiment 3
[0053] Weigh 0.25g of levulinic acid into a 50mL beaker, dissolve it with ultrapure water, adjust its pH value to 5-6 with NaOH solution, and prepare 25ml of levulinic acid reaction solution. Weigh 0.075g of supported copper-based composite catalyst CuO-PbO(30:15) / H-ZSM-5 into a 50ml autoclave, and then add the above-mentioned levulinic acid reaction solution. Afterwards, the reactor was sealed, and the N 2 Replace the air in the reactor with air, set the stirring speed to 400r / min, turn on the condensed water, the heating program is to raise the temperature from room temperature to 260°C after 40min, and keep it for 3.5h. and condensate, sampled and pretreated. Using Waters high performance liquid chromatography (model Waters Alliance 2695 HPLC, HPX-87H chromatographic column) for quantitative analysis of raw materials and products, the conversion rate of levulinic acid was 91.45%, and the yield of butanone was 69.23%.
[0054] Catalyst preparation parameters: carrier activ...
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