A kind of carbon composite nano-cobalt tetroxide-based formaldehyde normal temperature catalyst and preparation method thereof
A technology based on tricobalt tetroxide and tricobalt tetroxide, which is applied in the field of carbon-composite nano-cobalt tetraoxide-based formaldehyde catalysts at room temperature and its preparation, can solve the problems of the rarity of precious metals and high cost restrictions on large-scale applications, and achieve low loading of precious metals, good dispersion, and good The effect of applying the foreground
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[0027] A carbon-composite nanometer cobalt tetroxide-based formaldehyde catalyst at room temperature and a preparation method of the present invention comprise the following steps:
[0028] a. Add cobalt salt to deionized water containing surfactant, stir to obtain Co 2+ solution; the complexing agent is added to deionized water, stirred to obtain a complexing agent solution;
[0029] Wherein, the cobalt salt is cobalt nitrate, cobalt chloride, cobalt acetate or cobalt sulfate, the surfactant is CTAB, P123 or SDS, and the complexing agent is citric acid, tartaric acid, EDTA, DPTA, glucose or sodium alginate.
[0030] co 2+ The ratio of cobalt salt, surfactant and deionized water in the solution is (0.01~0.04) mol: (0.4~1) g: (40~100) mL; the ratio of complexing agent to deionized water in the complexing agent solution It is (0.01~0.06) mol: (10~60) mL.
[0031] b. Add complexing agent solution dropwise to Co 2+ solution, stirring and drying to obtain tricobalt tetroxide pr...
Embodiment 1
[0039] a. Add cobalt salt to deionized water containing surfactant and stir to obtain clear Co 2+ solution; the complexing agent is added to deionized water, stirred to obtain a clear complexing agent solution;
[0040] Wherein, the cobalt salt is cobalt nitrate hexahydrate, the surfactant is CTAB, and the complexing agent is citric acid. The ratio of cobalt nitrate hexahydrate, CTAB and deionized water is 0.02mol: 0.8g: 80mL. The ratio of citric acid to deionized water is 0.02mol:20mL.
[0041] b. Add complexing agent solution dropwise to Co at a rate of 8 mL / min 2+ In the solution, stir at 25°C for 30 minutes, and dry at 80°C to obtain the precursor of tricobalt tetroxide, and grind it into 200-300 mesh powder;
[0042] c. Mix the Pt precursor and tricobalt tetroxide precursor powder evenly, ball mill at a speed of 300rpm / min, and then heat up from room temperature to 250°C for 6h in an air atmosphere at a heating rate of 5°C / min;
[0043] The Pt precursor is chloroplati...
Embodiment 2
[0052] a. Add cobalt salt to deionized water containing surfactant and stir to obtain clear Co 2+ solution; the complexing agent is added to deionized water, stirred to obtain a clear complexing agent solution;
[0053] Wherein, the cobalt salt is cobalt chloride, the surfactant is SDS, and the complexing agent is tartaric acid. The ratio of cobalt chloride, SDS and deionized water is 0.02mol:0.6g:60mL. The ratio of tartaric acid to deionized water is 0.03mol:40mL.
[0054] b. Add complexing agent solution dropwise to Co at a rate of 10mL / min 2+ In the solution, stir at 25°C for 60 minutes, dry at 80°C to obtain the precursor of tricobalt tetroxide, and grind it into 200-300 mesh powder;
[0055] c. Mix the Pt precursor and tricobalt tetroxide precursor powder uniformly, ball mill at a speed of 300rpm / min, and then heat up from room temperature to 250°C for 4h in an air atmosphere at a heating rate of 10°C / min;
[0056] The Pt precursor is chloroplatinic acid hexahydrate, ...
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