Novel supported heteropolyacid catalyst and application thereof in preparation of levulinate
An acid catalyst, supported technology, applied in the preparation of carboxylate, molecular sieve catalyst, preparation of organic compounds, etc., can solve the problem of unsatisfactory effect, no technical solution report of levulinate catalyst, unfavorable product separation and catalyst recovery, etc. problems, to achieve the effect of easy recovery and recycling, improved acidity and recyclability, and stable properties
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Embodiment 1
[0031] Weigh molecular sieve Sapo-18 and polyacid compound H respectively by mass ratio 10:1 3 PW 12 o 40 It is 20ml water that the adsorption saturation of molecular sieve is measured by equal volume impregnation method, and polyacid compound H 3 PW 12 o 40 Pour it into the reactor, add 20ml of water, stir to dissolve, then add the polyacid solution dropwise to the Sapo-18 powder, stir while adding, stir for 60min after dissolving, let the reaction system stand for 24h, and precipitate light Gray solid, filtered and dried, put the solid in a muffle furnace, and calcined at 550 ° C for 4 hours to obtain 10% H 3 PW 12 o 40 / Sapo-18 catalyst.
[0032]Corn stalk powder 0.1g, 0.4g 10% H 3 PW 12 o 40 Put the catalyst of Sapo-18 into a high-pressure reactor, add 15ml of methanol solution, and heat and stir. The reaction temperature is 190°C, and the reaction time is 6h. After the reaction is finished, the reaction mixture is filtered after cooling, the clear liquid conta...
Embodiment 2
[0034] Weigh molecular sieve Sapo-18 and polyacid compound H respectively by mass ratio 10:2 3 PW 12 o 40 It is 20ml water that the adsorption saturation of molecular sieve is measured by equal volume impregnation method, and polyacid compound H 3 PW 12 o 40 Pour into the reactor, add 20ml of water, stir to dissolve, then add the polyacid solution dropwise to the Sapo-18 powder, stir while adding, stir for 60min after dissolving, let the reaction system stand for 24h, precipitate out Gray solid, filtered and dried, put the solid in a muffle furnace, and calcined at 550 ° C for 4 hours to obtain 20% H 3 PW 12 o 40 / Sapo-18 catalyst.
[0035] Corn stalk powder 0.1g, 0.3g 20% H 3 PW 12 o 40 Put the catalyst of Sapo-18 into a high-pressure reactor, add 15ml of methanol solution, and heat and stir. The reaction temperature is 190°C, and the reaction time is 6h. After the reaction is finished, the reaction mixture is filtered after cooling, the clear liquid contains me...
Embodiment 3
[0037] Weigh molecular sieve Sapo-18 and polyacid compound H respectively by mass ratio 10:3 3 PW 12 o 40 ; Count more as compound H 3 PW 12 o 40 Pour it into the reactor, add 20ml of water according to the equal volume impregnation method, stir to dissolve, then add the polyacid solution dropwise to the Sapo-18 powder, stir while adding, stir for 60min after dissolving, and let the reaction system stand Set aside for 24 hours, a light gray solid is precipitated, filtered and dried, the solid is placed in a muffle furnace, and calcined at 550 ° C for 4 hours to obtain 30% H 3 PW 12 o 40 / Sapo-18 catalyst.
[0038] Corn stalk powder 0.1g, 0.4g 20% H 3 PW 12 o 40 Put the catalyst of Sapo-18 into a high-pressure reactor, add 15ml of methanol solution, and heat and stir. The reaction temperature is 190°C, and the reaction time is 6h. After the reaction is finished, the reaction mixture is filtered after cooling, the clear liquid contains methyl levulinate, and the pr...
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