Single crystalline phase catalyst
A technology of catalysts and orthorhombic crystal phases, applied in the direction of heterogeneous catalyst chemical elements, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as loss
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Embodiment 1
[0123] Ammonium heptamolybdate tetrahydrate (17.03 g), ammonium metavanadate (3.35 g) and telluric acid (5.09 g) were dissolved in 284 g of water with heating. The resulting orange solution was cooled to 40 °C. Oxalic acid dihydrate (0.97 g) was dissolved in a solution of 6.5% w / w niobium oxalate in water (99.33 g). The resulting niobium-containing solution was added to the orange solution, and then 100 mg of the material prepared in Comparative Example 1 was added to the mixed solution. The mixture was dried on a rotary evaporator and then under vacuum (6 mbar) overnight. The resulting precursor was sieved to remove >50 mesh fines and then fired in a flowing atmosphere as follows: In an air atmosphere, the precursor was heated at 10°C / min from room temperature to 275°C and held at 275°C for 1 hour ; the atmosphere was changed to argon; in the argon atmosphere, the precursor was heated at 2°C / min from 275°C to 600°C, and then held at 600°C for 2 hours. The X-ray diffraction...
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