Preparation method of manganese-based composite metal oxide ozonolysis catalyst

[0032] Dissolve manganese nitrate and cerium nitrate in water respectively, configure a solution with a Mn / Ce molar ratio of 19:1 and mix evenly, mix 50mL NaOH solution and 20mL 30% H 2 o 2 The solution is added to the mixed solution at the same time, the metal ion M n+ with OH - The molar ratio of the solution is 1:2, and the solution changes from a colorless transparent solution to a dark brown turbid solution. After stirring for 20 minutes, it is heated to 60°C in a water bath, refluxed for 12 hours, filtered with suction, washed with deionized water and absolute ethanol, and finally in Dry in a vacuum oven at 60°C for 12 hours, and then bake the vacuum-dried product at 350°C in an air atmosphere to obtain a nanofibrous catalyst CeMn 19 o x -NO 3 ( figure 1 ). The catalyst was pressed into tablets and sieved into 40-60 mesh particles, and 0.1 g of the catalyst was taken and placed in a tubular fixed-bed reactor for evaluation of the catalyst. The results are shown in...

[0034] Dissolve manganese acetate and copper acetate in water respectively, configure a solution with a Mn / Cu molar ratio of 9:1 and mix evenly, mix 50mL NaOH solution and 20mL 30% H 2 o 2 The solution is added to the mixed solution at the same time, the metal ion M n+ with OH - The molar ratio of the solution is 1:2, and the solution changes from a blue transparent solution to a black turbid solution. After stirring for 20 minutes, it is heated to 60°C in a water bath, refluxed for 12 hours, filtered with suction, washed with deionized water and absolute ethanol, and finally in a vacuum Dry in an oven at 60°C for 12h. The vacuum-dried product was calcined at 350°C in an air atmosphere to obtain the catalyst CuMn 9 o x -Ac, the XRD pattern of the catalyst obtained is shown in figure 2 . XRD characterization shows that there is no obvious CuO peak, and CuMn is formed 2 o 4 composite metal oxides. The catalyst was pressed into tablets and sieved into 40-60 mesh particl...

[0036] Dissolve manganese nitrate and copper nitrate in water respectively, configure a solution with a molar ratio of Mn / Cu of 9:1 and mix evenly, mix 100mL NaOH solution and 30mL 30% H 2 o 2 The solution is added to the mixed solution at the same time, and the metal ion M n+ with OH - The molar ratio of the solution is 1:2, and the solution changes from a blue transparent solution to a black turbid solution. After stirring for 20 minutes, it is heated to 60°C in a water bath, refluxed for 12 hours, filtered with suction, washed with deionized water and absolute ethanol, and finally in a vacuum Dry in an oven at 60°C for 12h. The vacuum-dried product was calcined at 350°C in an air atmosphere to obtain a nanofibrous catalyst MnCu 9 o x -NO 3 ( image 3 ). The catalyst was pressed into tablets and sieved into 40-60 mesh particles, and 0.1 g of the catalyst was taken and placed in a tubular fixed-bed reactor for evaluation of the catalyst. The results are shown in Table...