A self-supporting noble metal modified manganese-based composite oxide catalyst and its preparation method and application
A technology of composite oxides and noble metals, applied in the field of catalysis, can solve problems such as difficulty in obtaining manganese-based composite oxide catalysts with ozone decomposition performance, weak combination of catalyst layers and metal phase supports, undisclosed preparation of manganese-based catalysts and catalytic performance, etc. , to achieve excellent ozone catalytic decomposition performance, easy storage, and stable structure
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Embodiment 1
[0042] a) Weigh 2.0g aluminum fiber (diameter 80μm, length 1-10mm), and use hydrothermal method to grow Al on the aluminum fiber in situ 2 o 3 Nanosheets to prepare catalyst supports;
[0043] b) At room temperature, dissolve 0.073g ferric chloride hexahydrate and 0.32g, 50wt% manganese nitrate solution in 3mL deionized water, and then use the prepared mixed aqueous solution containing manganese nitrate and ferric chloride to prepare step a) The catalyst carrier is subjected to equal-volume impregnation treatment, then taken out, and dried, and the obtained product is infiltrated with an aqueous solution of sodium carbonate with a mass concentration of 2%, then dried, washed, and dried again to obtain a manganese-based composite oxide catalyst Precursor;
[0044] c) At room temperature, dissolve 0.0024g of silver nitrate in 3mL of deionized water, then use the prepared silver nitrate aqueous solution to impregnate the manganese-based composite oxide catalyst precursor prepar...
Embodiment 2
[0055] a) with the step a) of embodiment 1;
[0056] b) at room temperature, dissolve 0.013g lanthanum nitrate hexahydrate and 0.03g manganese sulfate monohydrate in 3mL deionized water, then use the prepared mixed aqueous solution containing manganese sulfate and lanthanum nitrate to carry out the catalyst carrier prepared in step a) Equal-volume impregnation treatment, then taking out, drying, incipient wetness of the obtained product with a sodium carbonate aqueous solution having a mass concentration of 2%, then drying, washing, and drying again to obtain a manganese-based composite oxide catalyst precursor;
[0057] c) at room temperature, dissolve 0.0013g of chloroplatinic acid hexahydrate in 3mL of deionized water, and then use the prepared aqueous solution of chloroplatinic acid to impregnate the manganese-based composite oxide catalyst precursor prepared in step b) with equal volume, Then take it out, dry it, and bake it at 600° C. for 1 hour to obtain the self-suppor...
Embodiment 3
[0060] a) Weigh 8 pieces of aluminum mesh with a diameter of 36mm and a mesh number of 30 (3g, the diameter of the aluminum fiber is 0.3mm, and the thickness is about 0.4mm), and the aluminum mesh is grown in situ by the hydrothermal method. 2 o 3 Nanosheets to prepare catalyst supports;
[0061] b) at room temperature, dissolve 0.25g nickel nitrate hexahydrate and 0.29g manganese sulfate monohydrate in 2mL deionized water, then use the prepared mixed aqueous solution containing manganese sulfate and nickel nitrate to carry out the catalyst carrier prepared in step a) Equal-volume impregnation treatment, then taking out, drying, incipient wetness of the obtained product with a sodium carbonate aqueous solution having a mass concentration of 2%, then drying, washing, and drying again to obtain a manganese-based composite oxide catalyst precursor;
[0062] c) at room temperature, 0.031g of chloroauric acid tetrahydrate was dissolved in 2mL of deionized water, and then the manga...
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