Mesoporous ceria hollow sphere or mesoporous ceria/carbon composite hollow sphere and preparation method thereof
A technology of carbon composite materials and cerium oxide, applied in the direction of rare earth metal oxide/hydroxide, metal/metal oxide/metal hydroxide catalyst, chemical instruments and methods, etc., can solve complex operation and long reaction time , pollute the environment and other problems, to achieve the effect of solving complex raw materials, short reaction time and large specific surface area
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Embodiment 1
[0032] 1) Using cerium nitrate hexahydrate and citric acid monohydrate as raw materials, according to the ratio of the amount of substances of 1:0.1, make an aqueous solution with a concentration of 0.5mol / L, and stir magnetically for 3 hours at room temperature, and fully mix;
[0033] 2) Put the mixed solution into a microwave reaction bottle, react at 200°C for 2 minutes, after the reaction is completed, cool down to room temperature, perform suction filtration, wash with distilled water for 3 times, and then put the washed sample in a drying oven at 80°C for 8 hours , to obtain a hollow spherical ceria precursor;
[0034] 3) Place the dried hollow spherical ceria precursor in a tube furnace. Under an air atmosphere, start from room temperature and raise the temperature to 280°C at a rate of 2°C / min. The furnace was cooled to room temperature to obtain mesoporous ceria hollow sphere powder.
[0035] The CeO prepared by microwave hydrothermal in this example 2 The appearan...
Embodiment 2
[0037] 1) Using cerium nitrate hexahydrate and citric acid monohydrate as raw materials, according to the ratio of the amount of substances of 1:0.5, make an aqueous solution with a concentration of 0.1mol / L, stir magnetically for 4 hours at room temperature, and fully mix;
[0038] 2) Put the mixed solution into a microwave reaction bottle, react at 170°C for 2min, after the reaction is completed, cool down to room temperature, perform suction filtration, wash with distilled water for 3 times, and then put the washed sample in a drying oven at 80°C for 20h , to obtain a hollow spherical ceria precursor;
[0039] 3) Place the dried hollow spherical ceria precursor in a tube furnace, raise the temperature up to 300°C at a rate of 0.5°C / min in an air atmosphere, keep it warm for 1 hour, and cool it down to room temperature with the furnace after the heat preservation is over. The mesoporous ceria hollow sphere powder is obtained.
[0040] The CeO prepared by microwave hydrother...
Embodiment 3
[0042] 1) Using cerium nitrate hexahydrate and citric acid monohydrate as raw materials, according to the ratio of the amount of substances of 1:0.7, make an aqueous solution with a concentration of 0.1mol / L, and stir magnetically for 2 hours at room temperature, and fully mix;
[0043] 2) Put the mixed solution into a microwave reaction bottle, react at 150°C for 2 minutes, after the reaction is completed, cool down to room temperature, perform suction filtration, wash with distilled water for 3 times, and then put the washed sample in a drying oven at 80°C for 12 hours , to obtain a hollow spherical ceria precursor;
[0044] 3) Place the dried hollow spherical ceria precursor in a tube furnace, raise the temperature up to 600°C at a rate of 2°C / min in an Ar atmosphere, keep it for 1 hour, and cool it down to room temperature with the furnace after the hold. Obtain mesoporous ceria / carbon composite hollow spheres.
[0045] The CeO prepared by microwave hydrothermal in this e...
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