Preparation and application of macroporous-mesoporous Cu2O/Cu3(OH)2(CO3)2 catalyst
A CO2, co-catalyst technology, applied in the field of catalysis, can solve the problems of low activity and selectivity, and achieve the effect of excellent catalytic activity and stability
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Embodiment 1
[0052] The macroporous-mesoporous Cu of the present embodiment 2 O / Cu 3 (OH) 2 (CO 3 ) 2 Composite materials are made of figure 1 The octahedral Cu shown 2 CO was introduced into the mixture of O pellets and deionized water 2 Synthetic obtained by heating.
[0053] The specific operation is as follows: at room temperature, dissolve 1 mmol of copper chloride and 1 g of sodium polystyrene sulfonate (molecular weight: 70,000) in 200 mL of ionized water, add 1 mL of 6 mol / L sodium hydroxide aqueous solution and 0.1 mL of 85 % hydrazine hydrate, stirred for 30 minutes. The product was washed several times with a small amount of water and ethanol mixture, centrifuged, and then placed in a vacuum drying oven to remove residual water and ethanol at a drying temperature of 60°C. Cu was obtained after drying for 24 hours. 2 O regular octahedral particles. 0.5mmol of Cu 2 O particles were dispersed in 10 mL of deionized water by ultrasound, transferred to a reaction kettle, and...
Embodiment 2
[0059] Cu of different compositions of this embodiment 2 O / Cu 3 (OH) 2 (CO 3 ) 2 The synthesis method of the composite material is as follows:
[0060] 0.5mmol of Cu 2 O was dispersed in 10 mL of deionized water by ultrasound, transferred to a reaction kettle, and CO was added 2 to 8.46MPa. Place the pressurized reactor in a water bath at 35°C and stir for 0.5, 1, 1.5, 3, 5 h respectively, and then the CO 2 The pressure was released, and then the product was washed several times with a small amount of water and ethanol mixture, centrifuged, and then placed in a vacuum drying oven to remove residual water and ethanol. The drying temperature was 60°C, and it was obtained after drying for 24 hours. Cu with different compositions 2 O / Cu 3 (OH) 2 (CO 3 ) 2 composite material.
[0061] different compositions of Cu 2 O / Cu 3 (OH) 2 (CO 3 ) 2 The composite material was characterized by transmission electron microscopy and X-ray diffraction patterns, and the results we...
Embodiment 3
[0065] Cu in Example 1 2 O / Cu 3 (OH) 2 (CO 3 ) 2 The conversion rate and cyclicity test of the reactants for the thermal oxidation of alcohols to aldehydes catalyzed by composite materials with reaction time.
[0066] The specific implementation steps are:
[0067] The macroporous-mesoporous Cu prepared in Example 1 2 O / Cu 3 (OH) 2 (CO 3 ) 2 The composite material is used to catalyze the thermal oxidation of alcohols to aldehydes under alkali-free conditions. Add 1 mmol of alcohol and 1 mL of N,N-dimethylformamide into a 10 mL reactor, add 10 mg of Cu 2 O / Cu 3 (OH) 2 (CO 3 ) 2 The composite material and 0.5 mmol of cocatalyst 2,2',6,6'-tetramethylpiperidinium oxide were stirred for 10 min to make it completely mixed, and then connected to a bladder filled with oxygen. Transfer the reactor to a constant temperature water bath at 75°C, react for 0.5-16 hours, and detect the product by proton nuclear magnetic resonance. And under the same experimental conditions, ...
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