Co@NC high-dispersion core-shell structure catalyst, and preparation method and application of catalyst
A core-shell structure and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, structural parts, etc., can solve the problems that the preparation process needs to be further simplified, the size range of metal particles is large, and it is unfavorable for large-scale preparation. Achieve the effects of low raw material prices, inhibit growth and agglomeration, and facilitate large-scale production
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[0041] Example 1: Co@NC 1:104 -C-800(Co refers to Co(NO 3 )·6H 2 O, NC is dicyandiamide, 1:104 is Co(NO 3 )·6H 2 The molar ratio of O to dicyandiamine, C is glucose, the mass ratio of NC to C is 15:1, 800 means the pyrolysis temperature is 800℃)
[0042] Add 0.05g Co(NO 3 )·6H 2 O, 1.5g dicyandiamide and 0.1g glucose are dissolved in 20ml deionized water to obtain solution A; stir for 3h at 80℃ in an oil bath to fully dissolve and mix uniformly to obtain solution B; place the evenly mixed solution in an air drying oven Dry at 80℃ for 12h to obtain the catalyst precursor; place the dried precursor in a mortar, grind evenly and place it in a quartz boat, under the protection of nitrogen for 30℃ min -1 Program the temperature to 800℃, calcinate for 2h, and get Co@NC after natural cooling 1:104 -C-800 catalyst.
Example Embodiment
[0043] Example 2: Co@NC 1:104 -C-700(Co refers to Co(NO 3 )·6H 2 O, NC is dicyandiamide, 1:104 is Co(NO 3 )·6H 2 The molar ratio of O to dicyandiamide, C is glucose, the mass ratio of NC to C is 15:1, 700 means the pyrolysis temperature is 700℃)
[0044] Add 0.05g Co(NO 3 )·6H 2 O, 1.5g dicyandiamine and 0.1g glucose are dissolved in 20ml deionized water to obtain solution A; stir for 0.5h in an oil bath at 100°C to fully dissolve and mix uniformly to obtain solution B; dry the evenly mixed solution in the air Dry in a box at 80℃ for 12 hours to obtain a catalyst precursor; place the dried precursor in a mortar, grind evenly and place it in a quartz boat, under nitrogen protection at 15℃ min -1 The temperature is increased to 700℃ and calcined for 45h, and Co@NC is obtained after natural cooling 1:104 -C-700 catalyst.
Example Embodiment
[0045] Example 3: Co@NC 200:7 -C-900(Co refers to Co(NO 3 )·6H 2 O, NC is dicyandiamide, 200:7 is Co(NO 3 )·6H 2 The molar ratio of O to dicyandiamine, C is glucose, the mass ratio of NC to C is 1:30, 900 means the pyrolysis temperature is 900℃)
[0046] Add 0.05g Co(NO 3 )·6H 2 O, 1.5g dicyandiamine and 0.1g glucose are dissolved in 20ml deionized water to obtain solution A; stir for 25h at 80°C in an oil bath to fully dissolve and mix uniformly to obtain solution B; dry the uniformly mixed solution in an inert atmosphere Dry in a box at 80℃ for 12 hours to obtain a catalyst precursor; place the dried precursor in a mortar, grind evenly and place it in a quartz boat, under nitrogen protection at 15℃ min -1 Program the temperature to 900℃, calcinate for 0.5h, and get Co@NC after natural cooling 1:104 -C-900 catalyst.
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