Antimony-containing low-carbon alkane ammoxidation catalyst
An oxidation catalyst, carbon alkane ammonia technology, applied in the direction of hydrocarbon ammoxidation preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve poor stability, poor selectivity, low catalyst yield and other issues to achieve good technical results
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Embodiment 1
[0051] 19.2 grams of ammonium metavanadate were dissolved in 600.0 grams of water at 80°C to obtain solution (I); 100.0 grams of ammonium heptamolybdate (containing four crystal waters, referred to as four waters, the same below) were dissolved in 600.0 grams of 30°C 10.8 grams of niobium oxalate hydrate was dissolved in 100.0 grams of water to form a solution (III), and a 0.1 mol / liter nitric acid solution (IV) was prepared; 25.0 grams of oxalic acid (dihydrate) was dissolved in 50.0 A solution (V) is formed in gram of water; wherein the molar ratio of oxalic acid molecules to molybdenum atoms is 0.35.
[0052] During the stirring process of solution (I) at 80°C, gradually add nitric acid solution (IV), so that the pH value of solution (I) is finally 3.0; then add 11.6 grams of antimony trioxide powder, stir at 90°C for 5 hours, and then Add solution (II) and solution (III) to solution (I), and finally add oxalic acid solution (V) to obtain a mixture slurry. After the slurry...
Embodiment 2
[0056] Weigh 10.0 g of the catalyst precursor in Example 1 and load it into a calcination furnace for calcination. First, at an oxygen space velocity of 300h -1 In the atmosphere of , the catalyst precursor was kept at 300 °C for 2 hours for pre-calcination; -1 Maintain 630°C in the atmosphere and bake for 2 hours.
[0057] After the catalyst was calcined, it was pressed into tablets and sieved, and the 60-80 mesh powder was used for the ammoxidation of propane. The reaction conditions were the same as in Example 1, and the results are shown in Table 1.
Embodiment 3
[0059] Weigh 10.0 g of the catalyst precursor in Example 1 and load it into a calcination furnace for calcination. First, when the ammonia air velocity is 200h -1 In the atmosphere of , the catalyst precursor was pre-calcined at 300 ° C for 2 hours; -1 Maintain 630°C in the atmosphere and bake for 2 hours.
[0060] After the catalyst was calcined, it was pressed into tablets and sieved, and the 60-80 mesh powder was used for the ammoxidation of propane. The reaction conditions were the same as in Example 1, and the results are shown in Table 1.
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