Single-atom noble metal catalysts prepared by ultrasonic-assisted displacement reaction and method thereof
A noble metal catalyst and replacement reaction technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as high cost, poor activity, unstable catalyst, etc., and achieve easy operation and good conditions Gentle, powerful effect
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Embodiment 1
[0044] Zn(NO 3 ) 2 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 O was dissolved in 50 ml of anhydrous methanol at a molar ratio of 97:3 (4.4 mmol in total) as solution A; 1.46 g of dimethylimidazole was weighed and dissolved in 50 ml of anhydrous methanol as solution B. Then ultrasonically disperse evenly, and in the state of stirring, add liquid B to liquid A drop by drop, and continue to stir for 12 h. Centrifuge and wash with anhydrous methanol. The sample obtained by centrifugation was dried at 60 °C, ground and dried in vacuum to obtain Zn with clean pores. 97 co 3 -ZIF.
[0045] The prepared Zn 97 co 3 - ZIF is evenly spread in the quartz porcelain boat, put into the tube furnace and calcined under high-purity Ar (flow rate 40ml / min). The calcination procedure was as follows: first, keep at 30 °C for 60 min, then raise the temperature to 950 °C at 2 °C / min, keep for 2 h, and finally lower the temperature to room temperature at a cooling rate of 5 °C / min. The obtained Co SAs...
Embodiment 2
[0049] Zn(NO 3 ) 2 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 O was dissolved in 50 ml of anhydrous methanol at a molar ratio of 98:2 (4.4 mmol in total) as solution A; 2.92 g of dimethylimidazole was weighed and dissolved in 50 ml of anhydrous methanol as solution B. Then ultrasonically disperse evenly, and in the state of stirring, add liquid B to liquid A drop by drop, and continue to stir for 6 h. Centrifuge and wash with anhydrous methanol. The sample obtained by centrifugation was dried at 60 °C, ground and dried in vacuum, and Zn with clean pores could be obtained. 98 co 2 -ZIF.
[0050] The prepared Zn 98 co 2 - ZIF is evenly spread in the quartz porcelain boat, put into the tube furnace in high-purity N 2 (flow rate 40ml / min) for calcination. The calcination procedure is as follows: first, keep at 30 °C for 60 min, then raise the temperature to 1000 °C at 2 °C / min, keep for 2 h, and finally cool down to room temperature at a cooling rate of 10 °C / min. The obtained Co...
Embodiment 3
[0054] Zn(NO 3 ) 2 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 O was dissolved in 50 ml of anhydrous methanol at a molar ratio of 98:2 (4.4 mmol in total) as solution A; 2.92 g of dimethylimidazole was weighed and dissolved in 50 ml of anhydrous methanol as solution B. Then ultrasonically disperse evenly, and in the state of stirring, add liquid B to liquid A drop by drop, and continue to stir for 24 h. Centrifuge and wash with anhydrous methanol. The sample obtained by centrifugation was dried at 60 °C, ground and dried in vacuum, and Zn with clean pores could be obtained. 98 co 2 -ZIF.
[0055] The prepared Zn 98 co 2 - ZIF is evenly spread in the quartz porcelain boat, put into the tube furnace and calcined under high-purity Ar (flow rate 40ml / min). The calcination procedure was as follows: first, keep at 30 °C for 60 min, then raise the temperature to 1000 °C at 2 °C / min, keep for 2.5 h, and finally cool down to room temperature at a cooling rate of 5 °C / min. The obtained Co...
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