Catalyst for preparing formaldehyde through methanol oxidation

[0023] [Example 1]

[0024] 14.4 g of molybdenum oxide was added to 110ml of 10% hydrogen peroxide, and after stirring for 8 hours at a reaction temperature of 80°C, 55ml of 1M nitric acid solution was added and stirring was continued for 16 hours to obtain a peroxymolybdic acid solution. The solution was put into an autoclave and reacted at 150°C for 72 hours to obtain nanorod molybdenum oxide.

[0025] Take 23.04 grams of the above molybdenum oxide and add it to the mixed solution containing 24.4 ferric nitrate and 0.9 grams of manganese nitrate, Mo / Fe molar ratio = 1.6:1, add 10 grams of hydroxyapatite, stir for 4 hours, and place at 100°C Dry in an oven for 24 hours, and then calcinate at 400°C for 10 hours to obtain a nanometer iron molybdate catalyst named NMF-1.

[0026] [Example 2]

[0027] 14.4 g of molybdenum oxide was added to 110ml of 10% hydrogen peroxide, and after stirring for 8 hours at a reaction temperature of 80°C, 55ml of 1M citric acid solution was added, and stirring was continued for 16 hours to obtain a peroxymolybdic acid solution. The solution was put into an autoclave and reacted at 160°C for 72 hours to obtain nanorod molybdenum oxide.

[0028] Take 31.68 grams of the above molybdenum oxide and add it to a solution containing 24.4 grams of ferric nitrate, Mo / Fe molar ratio=2.2:1, add 20 grams of hydroxyapatite, stir for 4 hours, and place it in an oven at 100°C for 24 hours. Then calcined at 500°C for 6 hours to obtain nanometer iron molybdate catalyst, and named NMF-2.

[0029] [Example 3]

[0030] 14.4 g of molybdenum oxide was added to 110 ml of 10% hydrogen peroxide, and after stirring for 8 hours at a reaction temperature of 80°C, 55 ml of 1M oxalic acid solution was added, and stirring was continued for 16 hours to obtain a peroxymolybdic acid solution. The solution was put into an autoclave and reacted at 180°C for 48 hours to obtain nanorod molybdenum oxide.

[0031] Take 51.84 grams of the above molybdenum oxide and add it to the mixed solution containing 24.4 grams of ferric nitrate and 0.74 grams of tin nitrate, Mo / Fe molar ratio = 3.6:1, add 30 grams of hydroxyapatite, stir for 4 hours, and put it to 100 It was dried in an oven at ℃ for 24 hours and then calcined at 550 ℃ for 6 hours to obtain a nano-iron molybdate catalyst, which was named NMF-3.