Preparation method of chromium-molybdenum-containing polyethylene catalyst
A catalyst, polyethylene technology, used in the production of bulk chemicals, etc.
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Embodiment 1
[0041] The porous inorganic carrier is prepared by modifying the inorganic carrier silica through aluminum, titanium and fluorine. The average particle size of the inorganic carrier is 47 microns, and the pore volume is 3.5 cm 3 / g, the surface area is 420m 2 / g. The modified inorganic support was immersed in an aqueous solution containing chromium trioxide, chromium nitrate and molybdenum acetate for 6 hours at a temperature of 55°C, and then dried at 120°C for 11 hours. The catalysts are prepared through specific activation procedures of active sites.
[0042] The specific activation process is: raising the temperature from 300°C to 500°C at a rate of 5min / °C, constant temperature for 2.7h, using a nitrogen atmosphere; then raising the temperature to 700°C at a rate of 9min / °C, constant temperature for 10.0h, using an oxygen atmosphere; finally The temperature was raised to 900°C at 13min / °C, and the temperature was kept constant for 9.0h, using a nitrogen atmosphere; the ...
Embodiment 2
[0046] The porous inorganic carrier is prepared by the co-modification of aluminum, titanium and fluorine on the inorganic carrier Al2O3. The average particle size of the inorganic carrier is 100 microns, and the pore volume is 7.3 cm 3 / g, the surface area is 210m 2 / g. The modified inorganic carrier was immersed in an aqueous solution containing chromium acetate, chromium chloride and ammonium metamolybdate for 9 hours at 60°C, and then dried at 150°C for 15 hours. The catalysts are prepared through specific activation procedures of active sites.
[0047] The specific activation process is as follows: raise the temperature from 300°C to 500°C at a heating rate of 4min / °C, keep the temperature for 2.5h, and use nitrogen atmosphere; then raise the temperature to 700°C at 6min / °C, keep the temperature for 4.0h, and use oxygen atmosphere; The temperature was raised to 950°C at 9min / °C, and the temperature was kept constant for 5.0h, using a nitrogen atmosphere; the cooling rat...
Embodiment 3
[0051] The porous inorganic carrier is prepared by modifying the inorganic carrier zirconia through aluminum, titanium and fluorine. The average particle size of the inorganic carrier is 62 microns, and the pore volume is 0.5 cm 3 / g, the surface area is 50m 2 / g. The modified inorganic support was immersed in an aqueous solution containing chromium sulfate, ammonium chromate and sodium molybdate for 3 hours at a temperature of 40°C, and then dried at 130°C for 9 hours. The catalysts are prepared through specific activation procedures of active sites.
[0052] The specific activation process is as follows: raise the temperature from 300°C to 500°C at a rate of 3min / °C, keep the temperature for 3h, and use nitrogen atmosphere; then raise the temperature to 700°C at 10min / °C, keep the temperature for 3.0h, and use oxygen atmosphere; / °C to 1000°C, constant temperature for 10.0h, using a nitrogen atmosphere; cooling rate of 20min / °C, using a nitrogen atmosphere to cool down to ...
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