Method for preparing perovskite oxide LaMnO3 hollow spheres
A perovskite type, oxide technology, applied in the direction of manganate/permanganate, etc., to achieve the effect of easy availability of raw materials, simple preparation process and cheap raw materials
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Embodiment 1
[0014] Embodiment 1: take by weighing 6.5g La(NO 3 ) 3 ·6H 2 O and 4.15 mL of 50% Mn(NO 3 ) 2 Put the aqueous solution in a beaker, add 3mL of polyethylene glycol 400, and stir magnetically for 4 hours to form a homogeneous solution, then add 18mL of methanol. This solution is the precursor solution. The above mixed solution was poured into a beaker equipped with 1.0 g polymethyl methacrylate (PMMA) microsphere hard template. In order to keep the original orderly arrangement of PMMA, do not stir during the pouring process of this mixed solution. After the mixed solution was impregnated with PMMA for about 5 hours, the solid obtained by suction filtration was dried at room temperature for 12 hours, and then the solid was loaded into a magnetic boat and placed in a tube furnace. 2 Under the atmosphere (20mL / min), the temperature was raised from room temperature to 300°C at a rate of 1°C / min and kept at this temperature for 3 hours. The rate of min rises to 750°C and is ke...
Embodiment 2
[0015] Embodiment 2: take by weighing 6.5g La(NO 3 ) 3 ·6H 2 O and 4.15 mL of 50% Mn(NO 3 ) 2 Put the aqueous solution in a beaker, add 5mL of polyethylene glycol 400, and stir magnetically for 4 hours to form a homogeneous solution, then add 16mL of methanol. This solution is the precursor solution. The above mixture was poured into a beaker containing 1.0 g of PMMA. In order to maintain the original orderly arrangement of PMMA, no stirring is performed during the pouring of the mixed solution. After the mixed solution was impregnated with PMMA for about 5 hours, the solid obtained by suction filtration was dried at room temperature for 12 hours, and then the solid was loaded into a magnetic boat and placed in a tube furnace. 2 Under the atmosphere (20mL / min), the temperature was raised from room temperature to 300°C at a rate of 1°C / min and kept at this temperature for 3 hours. The rate of min rises to 750°C and is kept at this temperature for 4h to obtain the perovsk...
Embodiment 3
[0016] Embodiment 3: take by weighing 6.5g La(NO 3 ) 3 ·6H 2 O and 4.15 mL of 50% Mn(NO 3 ) 2 Put the aqueous solution in a beaker, add 7mL of polyethylene glycol 400, and stir magnetically for 4 hours to form a homogeneous solution, then add 14mL of methanol. This solution is the precursor solution. The above mixture was poured into a beaker equipped with 1.0 g of PMMA hard template. In order to maintain the original orderly arrangement of PMMA, no stirring is performed during the pouring of the mixed solution. The mixed solution was impregnated with PMMA for about 5 hours, and the solid obtained by suction filtration was dried at room temperature for 24 hours, and then the solid was loaded into a magnetic boat and placed in a tube furnace. 2 Under the atmosphere (20mL / min), the temperature was raised from room temperature to 300°C at a rate of 1°C / min and kept at this temperature for 3 hours. The rate of min rises to 750°C and is kept at this temperature for 4h to obt...
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