A kind of preparation method of alkaline earth metal carbonate-carbon airgel composite catalyst
A technology of composite catalysts and alkaline earth metal salts, applied in chemical instruments and methods, physical/chemical process catalysts, organic chemistry, etc., can solve the problems of polluted products, difficult post-processing, difficult recovery of homogeneous alkali catalysts, etc., and achieve easy recovery , high selectivity, and mild reaction conditions
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Embodiment 1
[0019] Dissolve 10g of glucose and 6g of polyvinylpyrrolidone (K30) in 60mL of water, add 1.17g of barium hydroxide and 1.11g of sodium carbonate, adjust the pH to 9, transfer the mixture to a closed reaction kettle, and react at 200°C for 5 hours , a columnar gel was obtained after the reaction, see figure 1 (a), the gel was freeze-dried and then calcined at 550 °C for 3 hours under nitrogen atmosphere to obtain a barium carbonate / carbon airgel composite, its XRD see figure 2 (JCPDS 05-0378) ( figure 2 I), is the barium carbonate diffraction peak.
Embodiment 2
[0021] Dissolve 5.5g sucrose and 0.5g polyacrylamide (Mw: 2000000~14000000) in 20mL water, add 1.17g calcium nitrate tetrahydrate and 1.106g sodium carbonate, add triethylamine to adjust the pH to 9, transfer the mixture to In a closed reaction kettle, react at 200°C for 5 hours. After the reaction, a cylindrical gel is obtained. See figure 1 (b), the gel was freeze-dried and calcined at 350°C for 2 hours under a nitrogen atmosphere to obtain a barium carbonate / carbon airgel composite catalyst, its XRD see image 3 , is the calcium carbonate diffraction peak.
Embodiment 3
[0023] Dissolve 5g of lactose and 0.6g of polyacrylamide (Mw: 2000000~14000000) in 15mL of water, add 1.04g of barium nitrate and 0.38g of ammonium carbonate, add triethylamine to adjust the pH to 7, and transfer the mixture to a closed reactor , reacted at 200°C for 5 hours, and a columnar gel was obtained after the reaction. The gel was freeze-dried and calcined at 700°C for 4 hours under a nitrogen atmosphere to obtain a barium carbonate / carbon airgel composite catalyst. The XRD is shown in figure 2 (JCPDS 05-0378) ( figure 2 II).
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