Manganese-based catalyst for volatile organic compound governance, and preparation and application thereof
A technology of volatile organic compounds and manganese-based catalysts, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, heterogeneous catalyst chemical elements, etc., can solve the problem that the activity is not as good as precious metals, etc. Achieve the effects of no washing, high anti-sintering, and good catalytic activity
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[0039] The following is a detailed description of the preparation of the manganese-based catalyst in the present invention, that is, the oxalate colloidal co-precipitation method.
[0040] The specific operation of the oxalate colloidal co-precipitation method is as follows:
[0041] Manganese salt and other metal salts are dissolved in absolute ethanol and stirred at room temperature to prepare a homogeneous metal solution. Other metal salt solutions include one or two of cobalt salt, cerium salt, and chromium salt. Oxalic acid is dissolved in absolute ethanol and forms a uniform and transparent oxalic acid solution at room temperature. Slowly drip the oxalic acid solution into the metal solution and continue to stir for 4-6 h to alcoholyze the metal salt. The obtained metal solid solution solution is vacuum filtered to obtain a solid material and then dried in a 60-80° C. blast oven to obtain a solid layer. The solid layer is calcined in a muffle furnace at 300-700°C to obtain...
Example Embodiment
[0048] Example 1: Manganese-cobalt composite oxide
[0049] Weigh 1.07 g of 50% manganese nitrate aqueous solution and 5.24 g of cobalt nitrate hexahydrate and dissolve them in 200 mL of absolute ethanol, stir until they dissolve, and form a uniform and transparent metal solution. In addition, weigh 3.62 g of oxalic acid dihydrate and dissolve it in 50 mL of absolute ethanol, stir until dissolved, and form a uniform and transparent oxalic acid solution. The oxalic acid solution was slowly dropped into the metal solution, and after all was dissolved, the stirring was continued for 4 h to form a solid suspension. The suspension was vacuum filtered, dried in a 70℃ blast oven for 12 hours, and then placed in a muffle furnace for roasting. The temperature was increased to 500℃ at a heating rate of 2℃ / min, and Mn was obtained after keeping it for 4 hours. 1 Co 3 O x catalyst.
[0050] Mn 1 Co 3 The performance evaluation of Ox catalyst for catalytic combustion of benzene is as follows: ...
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[0054] Example 2: Manganese-cobalt composite oxide
[0055] Weigh 0.73 g of 50% manganese nitrate aqueous solution and 5.82 g of cobalt nitrate hexahydrate and dissolve them in 200 mL of absolute ethanol, stir until they dissolve, and form a uniform and transparent metal solution. In addition, weigh 3.62 g of oxalic acid dihydrate and dissolve it in 50 mL of absolute ethanol, stir until dissolved, and form a uniform and transparent oxalic acid solution. The oxalic acid solution was slowly dropped into the metal solution, and after all was dissolved, the stirring was continued for 4 h to form a solid suspension. The suspension was vacuum filtered and placed in a 70°C blast oven for 12 hours to dry, and then placed in a muffle furnace for roasting. The temperature was raised to 500°C at a heating rate of 2°C / min, and Mn was obtained after 4 hours. 1 Co 5 O x catalyst.
[0056] Mn 1 Co 5 The performance evaluation of Ox catalyst for catalytic combustion of benzene is as follows:
[00...
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