Cobalt-manganese composite oxide supported catalyst for removal of formaldehyde at room temperature and preparation method of cobalt-manganese composite oxide supported catalyst
A supported catalyst and composite oxide technology, which is applied in the field of cobalt-manganese composite oxide supported catalyst and its preparation, to achieve long service life, uniform dispersion and good stability
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[0027] The preparation method of the above-mentioned cobalt-manganese composite oxide supported catalyst for removing formaldehyde at room temperature comprises the following steps:
[0028] 1) Dissolving precious metal salts, cobalt salts, manganese salts and 2,5-dihydroxyterephthalic acid in a solvent, fully reacting, filtering to obtain precipitates, and drying to obtain MOFs supported by precious metal particles;
[0029] 2) Pyrolysis of MOFs supported by noble metal particles to obtain powder catalyst;
[0030] 3) placing the powdered catalyst in a reducing atmosphere for reduction to obtain a cobalt-manganese composite oxide-supported noble metal catalyst, that is, a cobalt-manganese composite oxide-supported catalyst for removing formaldehyde at room temperature.
[0031] Preferably, the noble metal salt described in step 1) is at least one of platinum salt, palladium salt and rhodium salt.
[0032] Preferably, the cobalt salt described in step 1) is at least one of co...
Embodiment 1
[0042] A preparation method for a cobalt-manganese composite oxide supported catalyst for removing formaldehyde at room temperature, comprising the following steps:
[0043] 1) Dissolve tetraammine platinum nitrate, cobalt nitrate, manganese nitrate and 2,5-dihydroxyterephthalic acid in ethanol / N,N-dimethylformamide mixed solvent, Pt 4+ , (Co 2+ +Mn 2+ ), 2,5-dihydroxyterephthalic acid, (C 2 h 5 OH+DMF) with a molar ratio of 0.001:1:0.4:600, reacted at 130°C for 24h, filtered to obtain a gray-purple precipitate, and vacuum-dried at 120°C for 12h to obtain a Pt-loaded metal-organic framework material Pt / MnCo-MOF;
[0044] 2) Pt / MnCo-MOF was placed in the air atmosphere, and was pyrolyzed at 500°C for 0.5h to obtain a powder catalyst;
[0045] 3) Place the powdered catalyst in a mixed gas of hydrogen and nitrogen (volume ratio of hydrogen and nitrogen: 1:9), and reduce at 200°C for 1 hour to obtain Pt / MnCoO χ (black powder), that is, a cobalt-manganese composite oxide support...
Embodiment 2
[0047] A preparation method for a cobalt-manganese composite oxide supported catalyst for removing formaldehyde at room temperature, comprising the following steps:
[0048] 1) Dissolve palladium nitrate, cobalt chloride, manganese chloride and 2,5-dihydroxyterephthalic acid in a mixed solvent of isopropanol / N,N-dimethylformamide, Pd 2+ , (Co 2+ +Mn 2+ ), 2,5-dihydroxyterephthalic acid, (isopropanol+DMF) in a molar ratio of 0.005:1:0.5:700, reacted at 135°C for 24h, filtered to obtain a gray-purple precipitate, dried in vacuum at 120°C for 12h, and obtained Pd-loaded metal-organic framework material Pd / MnCo-MOF;
[0049] 2) Pd / MnCo-MOF was placed in the air atmosphere, and was pyrolyzed at 400°C for 1 hour to obtain a powder catalyst;
[0050] 3) Put the powdered catalyst in the mixed gas of hydrogen and nitrogen (the volume ratio of hydrogen and nitrogen is 1:9), and reduce it at 200°C for 2 hours to obtain Pd / MnCoO χ (black powder), that is, a cobalt-manganese composite ...
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