Co3O4-MOx/gamma-Al2O3 supported heterogeneous catalyst as well as preparation method and application thereof
A heterogeneous catalyst, supported technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve unfavorable industrial production, unstable chemical properties, slow Corrosion and other problems, to achieve the effect of easy industrial scale-up, long service life, and improved activity
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[0043] A kind of Co 3 o 4 -MO X / γ-Al 2 o 3 The preparation method of supported heterogeneous catalyst, comprises the following steps:
[0044] 1) Add γ-Al 2 o 3 (The specific surface area is 100-150m 2 / g, the particle size is 30-50nm) is immersed in the cobalt salt solution at room temperature for 10-20h, and then washed, dried, and roasted at 450-500°C for 3-8h to obtain the catalyst precursor;
[0045] 2) Immerse the catalyst precursor in the additive metal salt solution at room temperature for 15-25 hours, and then successively wash, dry, roast at 350-400°C for 4-9 hours, and grind to obtain a particle size of 2-3mm. type heterogeneous catalyst;
[0046] Wherein, M includes Mn, Fe, Ni or Cu; and the metal promoter salt includes manganese salt, iron salt, nickel salt or copper salt.
[0047] Among them, Co 3 o 4 -MO X / γ-Al 2 o 3 Among them, Co loading is 5-7wt%, M loading is 2-3wt%; cobalt salts include cobalt acetate and cobalt nitrate; manganese salts incl...
Embodiment 1
[0059] This example is used to prepare a Co 3 o 4 -MnO 2 / γ-Al 2 o 3 Supported heterogeneous catalyst, the specific preparation method comprises the following steps:
[0060] 1) Add 24.7g of cobalt nitrate hexahydrate (or cobalt acetate with the same cobalt content as needed) into 150mL of distilled water and mix evenly to obtain a cobalt nitrate solution, then take 93.0g of γ-Al that has been repeatedly rinsed and soaked in distilled water for 5 hours 2 o 3 (The specific surface area is 140m 2 / g, particle size is 40nm), soaked in cobalt nitrate solution at room temperature for 15h and washed, removed most of the water by rotary evaporation, then dried at 110°C for 10h, and then calcined at 500°C for 5h to obtain Co 3 o 4 / γ-Al 2 o 3 ;
[0061] 2) will Co 3 o 4 / γ-Al 2 o 3 Immerse in 150mL solution containing 10.5g manganese nitrate hexahydrate (or manganese acetate and manganese chloride with the same manganese content as needed) at room temperature for 20 hour...
Embodiment 2
[0063] This example is used to prepare a Co 3 o 4 -MnO 2 / γ-Al 2 o 3 Supported heterogeneous catalyst, the specific preparation method comprises the following steps:
[0064] 1) Add 29.6g of cobalt nitrate hexahydrate to 150mL of distilled water and mix evenly to obtain a cobalt nitrate solution, then take 91.5g of γ-Al that has been repeatedly rinsed and soaked in distilled water for 5 hours 2 o 3 (The specific surface area is 140m 2 / g, particle size is 40nm), soaked in cobalt nitrate solution at room temperature for 15h and washed, removed most of the water by rotary evaporation, then dried at 110°C for 10h, and then calcined at 500°C for 5h to obtain Co 3 o 4 / γ-Al 2 o 3 ;
[0065] 2) will Co 3 o 4 / γ-Al 2 o 3 Immerse in 150mL solution containing 10.5g manganese nitrate hexahydrate for 20h at room temperature, remove most of the water by rotary evaporation, then dry at 110°C for 10h, then roast at 400°C for 6h, and then use rotational molding method to make par...
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