Al2O3 particles synergistically modified by rare earth metal and phosphorus and preparation method of Al2O3 particles
A rare earth metal and synergistic modification technology, which is applied in chemical instruments and methods, separation methods, and dispersed particle separation, etc., can solve the problems of inability to control surface acidity and alkalinity, decrease of specific surface area and porosity, single surface acidity and alkalinity, etc. problems, to achieve the effect of facilitating catalyst performance adjustment, inhibiting high-temperature phase transition, and enhancing surface alkalinity
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Embodiment 1-4
[0048] The γ-type alumina C1 with synergistic surface modification of rare earth elements and phosphorus was prepared by the following steps:
[0049] A. Al(NO 3 ) 3 9H 2 O is formulated into 0.1-1.5mol / L Al(NO 3 ) 3 Solution, add 1:1-1:6 (volume ratio) ammonia water dropwise to the solution, keep stirring, the solution viscosity gradually increases, and continue to drop ammonia water after reaching the thickest point (gel formation point) to adjust the pH of the gel to 5.5-7.5, stir, stand at room temperature, dry to constant weight, and calcine in a muffle furnace at 450-600°C for 6 hours to obtain pure γ-Al 2 o 3 .
[0050] B. Measure the saturated water absorption of the alumina. Prepare different concentrations of (NH 4 ) 2 HPO 4 Solution and rare earth metal soluble salt (nitrate, acetate, chloride) aqueous solution, mix the two evenly, add to γ-A1 2 o 3 , the resulting sample loadings ranged from 0.1 to 10 wt%.
[0051] C. Stand still at room temperature fo...
Embodiment 5-8
[0056] The γ-type alumina C2 with synergistic surface modification of rare earth elements and phosphorus was prepared by the following steps:
[0057] A. Al(NO 3 ) 3 9H 2 O is formulated into 0.1-1.5mol / L Al(NO 3 ) 3 Solution, add 1:1-1:6 (volume ratio) ammonia water dropwise to the solution, keep stirring, the solution viscosity gradually increases, and continue to drop ammonia water after reaching the thickest point (gel formation point) to adjust the pH of the gel to 5.5-7.5, after stirring for 0.5-3h, stand at room temperature for 10-30h, dry at 60-100°C to constant weight, and calcinate at 450-600°C for 2-6h in a muffle furnace to obtain pure γ-Al 2 o 3 .
[0058] B. Measure the saturated water absorption of the alumina. Prepare different concentrations of (NH 4 ) 2 HPO 4 Solution added to γ-A1 2 o 3 , the resulting sample loadings ranged from 0.1 to 10 wt%.
[0059] C. After standing at room temperature for 10-30 hours and drying overnight at 80-120° C., a p...
Embodiment 9-12
[0067] The γ-type alumina C3 with synergistic surface modification of rare earth elements and phosphorus was prepared by the following steps:
[0068] A. Al(NO 3 ) 3 9H 2 O is formulated into 0.1-1.5mol / L Al(NO 3 ) 3 Solution, add 1:1-1:6 (volume ratio) ammonia water dropwise to the solution, keep stirring, the solution viscosity gradually increases, and continue to drop ammonia water after reaching the thickest point (gel formation point) to adjust the pH of the gel to 5.5-7.5, after stirring for 0.5-3h, stand at room temperature for 10-30h, dry at 60-100°C to constant weight, and calcinate at 450-600°C for 2-6h in a muffle furnace to obtain pure γ-Al 2 o 3 .
[0069] B. Measure the saturated water absorption of the alumina. Prepare different concentrations of (NH 4 ) 2 HPO 4 Solution added to γ-A1 2 o 3 , the phosphorus loading of the obtained samples ranged from 0.1 to 10 wt%.
[0070] C. After standing at room temperature for 10-30 hours and drying overnight a...
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