Composite oxide catalyst and preparation method thereof
A technology of catalysts and oxides, which is applied in the field of preparation of the composite metal oxide catalyst, and can solve the problems of uneven distribution of catalyst active components, loss of active components, difficulty in accurately controlling catalysts, etc.
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[0054] 2. Preparation method of composite metal oxide catalyst
[0055] a) Prefabrication of the first part of composite oxide powder
[0056] In the present invention, the term "precursor compound" refers to a water-soluble compound or oxide containing elements required for the catalyst.
[0057] The method of the invention includes the step of forming a mixed slurry of Mo element, N element and M element. In this step, the amount of Mo element used accounts for 20-80% of the total molar amount of Mo element in the catalyst, preferably accounts for 30-70%, more preferably accounts for 40-60%, preferably accounts for 45-55%.
[0058] The step of forming the mixed slurry of Mo element, N element and M element in the present invention may be to form a solution of the precursor compound of Mo element, the precursor compound of N element and / or the precursor compound of M element, and then mix them. In one example of the present invention, the Mo precursor compound and the elem...
Embodiment 1
[0111] (i) Preparation of catalyst
[0112] Weigh 83.57 grams of ferric nitrate and 244.28 grams of cobalt nitrate and dissolve them in 300 mL of distilled water to obtain solution A. Weigh 195.82 grams of ammonium heptamolybdate and 0.48 grams of potassium hydroxide and dissolve them in 400 mL of distilled water to obtain solution B. The temperature of solution B is kept at 60°C. Under vigorous stirring, drop solution A into solution B, and continue stirring until the slurry is evenly mixed after the addition is complete. After the dropwise addition, the slurry was aged with stirring at 60°C for 1 hour, and then transferred to a porcelain dish.
[0113] Place the porcelain dish in an oven at 110°C for 8 hours, then raise the temperature to 150°C and continue drying for 5 hours to obtain a solid substance whose main component is Mo-Fe-Co-K, which is crushed into a powder with a particle size of less than 200 mesh for future use.
[0114] Weigh 15.9 g of ammonium heptamolybda...
Embodiment 2
[0120] (i) Preparation of catalyst
[0121] Weigh 83.57 grams of ferric nitrate and 244.28 grams of cobalt nitrate and dissolve them in 300 mL of distilled water to obtain solution A. Weigh 201.12 grams of ammonium heptamolybdate and 0.72 grams of sodium hydroxide and dissolve them in 400 mL of distilled water to obtain solution B. The temperature of solution B is kept at 60°C. Under vigorous stirring, drop solution A into solution B, and continue stirring until the slurry is evenly mixed after the addition is complete. After the dropwise addition, the slurry was aged with stirring at 60°C for 1 hour, and then transferred to a porcelain dish.
[0122] Place the porcelain dish in an oven at 110°C for 8 hours, then raise the temperature to 150°C and continue drying for 5 hours to obtain a solid substance whose main component is Mo-Fe-Co-Na, which is crushed into a powder with a particle size of less than 200 mesh for future use.
[0123] Weigh 10.6 g of ammonium heptamolybdate...
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Abstract
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