Preparation method and application of Au and Ag loaded mesoporous beta-MnO2 catalyst
A catalyst and mesoporous technology, applied in the application field of low-temperature catalytic combustion to eliminate formaldehyde, to achieve the effects of economical benefits, low energy consumption, and mild reaction conditions
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Embodiment 1
[0025] (1) Mn(NO 3 ) 2 4H 2 O was dissolved in deionized water to form a 7mol / L solution. Add KIT-6 into n-hexane solution to form a 20g / L solution, and stir well at room temperature for 2 hours. Under the condition of stirring, slowly add the above manganese nitrate solution into the KIT-6 n-hexane solution, wherein the mass ratio of Mn to KIT-6 is 1.0:1, then stir the mixed solution system at room temperature for 10 hours, filter with suction , and dried at 25°C to obtain a black product, which was placed in a tube furnace, purged with an air flow of 200mL / min, slowly raised to 300°C at 1°C / min, and kept at this temperature for 2 hours to obtain a black Powder, wash the black powder with 0.001mol / L sodium hydroxide solution at 50°C to remove the KIT-6 template, wash with deionized water to remove residual impurities, and finally, dry the product at 120°C for 20 hours to obtain β -MnO2 .
[0026] Dissolve chloroauric acid in deionized water to prepare a 0.01mol / L chloroa...
Embodiment 2
[0031] (1) Mn(NO 3 ) 2 4H 2 O was dissolved in deionized water to form a 9mol / L solution. Add KIT-6 into n-hexane solution to form a 30g / L solution, and stir thoroughly at room temperature for 4 hours. Under the condition of stirring, slowly add the above manganese nitrate solution in the n-hexane solution of KIT-6, wherein the mass ratio of Mn to KIT-6 is 3.0:1, then stir the mixed solution system at room temperature for 14 hours, pump Filter and dry at 40°C to obtain a black product, which is placed in a tube furnace, purged with an air flow rate of 300mL / min, slowly heated to 400°C at 3°C / min, and calcined at this temperature for 4 hours to obtain Black powder, then the black powder was washed with 0.009mol / L sodium hydroxide solution at 70°C to remove the KIT-6 template, washed with deionized water to remove residual impurities, and finally, the product was dried at 120°C for 20 hours, Get β-MnO 2 .
[0032] Dissolve chloroauric acid in deionized water to prepare a c...
Embodiment 3
[0037] (1) Mn(NO 3 ) 2 4H 2 O was dissolved in deionized water to form a 7mol / L solution. Add KIT-6 into n-hexane solution to form a 20g / L solution, and stir well at room temperature for 2 hours. Under the condition of stirring, slowly add the above manganese nitrate solution into the KIT-6 n-hexane solution, wherein the mass ratio of Mn to KIT-6 is 1.0:1, then stir the mixed solution system at room temperature for 10 hours, filter with suction , and dried at 25°C to obtain a black product, which was placed in a tube furnace, purged with an air flow of 200mL / min, slowly raised to 300°C at 1°C / min, and kept at this temperature for 2 hours to obtain a black Powder, wash the black powder with 0.001mol / L sodium hydroxide solution at 50°C to remove the KIT-6 template, wash with deionized water to remove residual impurities, and finally, dry the product at 120°C for 20 hours to obtain β -MnO 2 .
[0038] Dissolve silver nitrate in deionized water to make a 0.05mol / L silver nit...
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