Nano catalyst lanthanum strontium manganese oxide material and its preparation method and application
A nano-catalyst and nano-technology, applied in the direction of chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of large-scale industrial production, grain growth, High cost and other issues, achieve the effect of simple and controllable manufacturing process, prevent crystal growth, prevent attenuation and passivation
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[0031]The preparation method of the present invention is to adopt nano-template and low-temperature synthetic calcination technology, take nano-carbon black matrix as the core, gather the reaction precursor, and remove the carbon black matrix through drying and calcination to prevent La 0.7 Sr 0.3 MnO 3 The crystal of the material grows up, and the nano-La with better electrochemical performance is obtained. 0.7 Sr 0.3 MnO 3 Material.
[0032] In a preferred embodiment of the present invention, the specific manufacturing process of the method is:
[0033] 1. Distribute acetylene black with a particle size of about 30nm in water, and the acetylene black accounts for 1-5% of the total weight. At the same time, add 0.1-5% absolute ethanol by weight of the aforementioned liquid as a wetting agent;
[0034] 2. In the above aqueous solution, add manganese nitrate, strontium nitrate, and lanthanum nitrate solids respectively according to the stoichiometric ratio, and stir to di...
Embodiment 1
[0043] Fabricate nano La by the following steps 0.7 Sr 0.3 MnO 3 Catalyst material:
[0044] 1. Take 1g of acetylene black with a particle size of about 30nm and distribute it in 99g of water, and add 0.1g of absolute ethanol as a wetting agent;
[0045] 2. Add 3.43g of manganese nitrate, 4.36g of lanthanum nitrate, and 1.22g of strontium nitrate solid (9g in total) into the above aqueous solution, and stir to dissolve. Now in the solution, the concentration of nitrate plus acetylene black in water is 10%;
[0046] 3. Dilute the above solution into a thin liquid layer of 1mm, place it in a vacuum oven at 60°C, evacuate to a vacuum degree of 0.001MPa, and dry slowly for 48 hours;
[0047] 4. Dry the dried article at 150°C for 24 hours, then raise the temperature to 650°C in an air atmosphere, and keep the temperature constant for 12 hours to obtain La 0.7 Sr 0.3 MnO 3 ;
[0048] 5. Cool down to room temperature, take out the calcined powder, and pass through a 200-mesh ...
Embodiment 2
[0055] Fabricate nano La by the following steps 0.7 Sr 0.3 MnO 3 Catalyst material:
[0056] 1. Take 5g of acetylene black with a particle size of about 30nm and distribute it in 95g of water, and add 5g of absolute ethanol as a wetting agent;
[0057] 2. In the above aqueous solution, add 9.52g of manganese nitrate, 12.10g of lanthanum nitrate, and 3.38g of strontium nitrate solid (25g of nitrate in total) according to the stoichiometric ratio, and stir to dissolve. The concentration of nitrate plus acetylene black in water in the solution is 30%;
[0058] 3. Dilute the above solution into a thin liquid layer of 5mm, place it in a vacuum oven at 80°C, evacuate to a vacuum degree of 0.01MPa, and dry for 100 hours;
[0059] 4. Dry the dried item at 150°C for 72 hours, then raise the temperature to 700°C in an air atmosphere, and keep the temperature constant for 6 hours to obtain La 0.7 Sr 0.3 MnO 3 Complex;
[0060] 5. Cool down to room temperature, take out the calcin...
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