Ce-based oxide catalyst, and preparation method and application thereof
A technology of catalysts and oxides, applied in the field of nanometers, can solve the problems of low-temperature catalytic activity and selectivity that cannot meet actual requirements, and achieve the effects of improving redox ability, promoting adsorption, and high catalytic conversion rate
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[0027] Example 1 Co / CeO 2 Nanocube preparation
[0028] Add 1.736 g Ce(NO 3 ) 3 ·6H 2 O (molecular weight 434.12) and 0.034g Co(NO 3 ) 2 ·6H 2 O (molecular weight: 291.03) was dissolved in 10 mL of deionized water, and 70 mL, 6mol / L NaOH solution was added dropwise, stirred at room temperature for 1 h, then transferred to a hydrothermal kettle, reacted at 100°C for 24 h, centrifuged, The obtained product was washed 3 times with deionized water and ethanol, and then dried in vacuum at 60°C for 12 hours, then heated to 500°C at a rate of 3°C / min in a muffle furnace, and calcined for 3 hours.
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[0029] Example 2 Co / CeO 2 Preparation of nanospheres
[0030] Add 0.434 g Ce(NO 3 ) 3 ·6H 2 O (molecular weight 434.12), 0.010g Co(NO 3 ) 2 ·6H 2 O (molecular weight: 291.03) and 8 g of urea (molecular weight: 60) were added to a mixed solvent consisting of 70 mL of deionized water and 10 mL of ethanol, stirred at room temperature for 1 h, and then 0.1 mL of HCl (12M) was added at room temperature Stir vigorously for 1 h, then transfer to a hydrothermal kettle, react at 160 ℃ for 12 h, centrifuge, and wash the resulting product with deionized water and ethanol 3 times each, and then vacuum dry at 60 ℃ for 12 h, then in a muffle furnace In the process, the temperature is increased to 550°C at a rate of 3°C / min and calcined for 2 hours.
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[0031] Example 3 Co / CeO 2 Nanocone preparation
[0032] Add 1.042 g Ce(NO 3 ) 3 ·6H 2 O (molecular weight 434.12), 0.033g Co(NO 3 ) 2 ·6H 2 O (molecular weight: 291.03) and 0.384 g of urea (molecular weight: 60) were dissolved in 80 mL of deionized water, stirred at room temperature for 1 h, then transferred to a hydrothermal kettle, reacted at 120°C for 8 h, centrifuged, and the resulting product was used Ionized water and ethanol were washed 3 times each, and then vacuum dried at 60°C for 12 h, then heated to 500°C at a rate of 3°C / min in a muffle furnace, and roasted for 6 h.
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