Bifunctional catalyst and application of bifunctional catalyst in preparation of benzil by benzoin dehydrogenation/oxidation
A dual-functional catalyst and catalyst technology, which is applied in the direction of oxidative preparation of carbonyl compounds, carbon-based compound preparation, and organic compound preparation, can solve the problems of expensive reaction solvents, difficult separation and purification, and large emissions of environmental pollutants. Recyclable process, high catalytic activity, and the effect of reducing environmental pollution
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Embodiment 1
[0024] by Co 2+ It is immobilized on a macroporous styrene-based anion exchange resin through chemical bonds and used as a catalyst for the dehydrogenation-oxidation of benzoin to generate benzil.
[0025] Take by weighing 20 grams of macroporous strong basic quaternary ammonium anion-exchange resin (D261 type) that Tianjin Nankai University Resin Co., Ltd. produces, soak with the NaOH aqueous solution of 0.5mol / L first after 30 minutes, then wash with deionized water, finish pretreatment Treatment process: put the processed resin into a three-necked flask with a reflux condenser and a stirrer, add 80mL of dimethylformamide (DMF), and 5 grams of p-aldehyde benzoic acid, start the stirrer to stir, and heat to reflux 5h, cooled to room temperature, the resin was filtered off and washed with DMF. Add the reacted resin, 80 mL of xylene and 5 g of cobalt acetylacetonate into a three-necked flask. After heating to reflux for 3 hours, the resin was filtered out, fully soaked and wa...
Embodiment 2
[0028] by Cu 2+ It is immobilized on the super-strong gel type strong acid cationic resin through chemical bonds and used as a catalyst for the dehydrogenation-oxidation of benzoin to generate benzil.
[0029] Take by weighing 20 grams of super-strong gel type strong acid cationic resin (D-61 type) produced by Tianjin Nankai University Resin Co., Ltd., first use 0.5mol / L of HCl aqueous solution to soak for 30 minutes, and then wash with deionized water to complete the pre-treatment. Processing process: put the processed resin into a three-necked flask with a reflux condenser and a stirrer, add 80mL of deionized water, and 8 grams of copper acetate, start the stirrer to stir, heat and reflux for 5h, cool to room temperature, and filter out After the resin is filtered out, it is fully soaked and washed with deionized water and absolute ethanol respectively, and dried at 80°C. The copper content of the resin was determined to be 7.5%.
[0030] Above-mentioned resin is packed in...
Embodiment 3
[0032] The vanadyl anion is immobilized on the macroporous styrenic anion exchange resin through a chemical bond and used as a catalyst for the dehydrogenation-oxidation of benzoin to generate benzil.
[0033] Take by weighing 20 grams of macroporous strong basic quaternary ammonium anion-exchange resin (D261 type) that Tianjin Nankai University Resin Co., Ltd. produces, soak with the NaOH aqueous solution of 0.5mol / L first after 30 minutes, then wash with deionized water, finish pretreatment Treatment process: put the treated resin into a three-necked flask with a reflux condenser and a stirrer, add 70mL of deionized water, 10mL of ammonia water, and 5 grams of ammonium metavanadate, start the stirrer to stir, heat and reflux for 5h, and cool to At room temperature, after filtering out the resin, fully soak and wash with dimethylformamide (DMF) and absolute ethanol respectively, and dry at 80°C. The vanadium content of the resin was determined to be 3.4%.
[0034] Above-ment...
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