Three-hole silica gel carrier and supported polyethylene catalyst and its preparation method and application
A technology of catalyst and silica gel, which is applied in the field of catalyst and catalyst, can solve the problems of low ethylene polymerization activity, poor thermal stability and hydrothermal stability, and affect catalytic activity, and achieve high catalyst activity and high loading rate.
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[0031]In a second aspect, the present invention provides a method for preparing a three-porous silica gel carrier, the method comprising: contacting water glass, a template agent and n-butanol in an inorganic acid solution, and filtering the mixture obtained after the contact reaction Then, the obtained silica gel is ball-milled to obtain a solid powder; the solid powder is prepared into a slurry in an aqueous solution and then spray-dried and calcined in sequence; wherein, the method makes the average particle size of the prepared three-porous silica gel carrier Diameter is 20-60μm, specific surface area is 150-600m 2 / g, the pore volume is 0.1-2.5mL / g, the pore size is distributed in three peaks, and the three peaks correspond to the first most probable pore size with a pore size of 1-4.5nm, and the second most probable pore size with a pore size of 5-15nm. and the third most probable pore size with a pore size of 20-50 nm.
[0032] In the preparation method of the three-po...
Embodiment 1
[0072] This example is used to illustrate the three-porous silica gel carrier, the supported polyethylene catalyst and the preparation method thereof of the present invention.
[0073] (1) Preparation of three-porous silica carrier
[0074] Water glass with a concentration of 15% by weight, sulfuric acid solution with a concentration of 12% by weight, cetyltrimethylammonium bromide and n-butanol were mixed in a weight ratio of 5:1:1:1 and heated at 20°C The contact reaction was carried out for 1.5 h, then the pH value was adjusted to 3 with sulfuric acid with a concentration of 98 wt %, and then the obtained reaction material was subjected to suction filtration and washed with distilled water until the sodium ion content was 0.02 wt % to obtain a silica gel filter cake.
[0075] Put 10g of the above-prepared silica gel filter cakes together into a 100mL ball mill jar, wherein the ball mill jar is made of polytetrafluoroethylene, the material of the grinding balls is agate, the...
Embodiment 2
[0092] This example is used to illustrate the three-porous silica gel carrier, the supported polyethylene catalyst and the preparation method thereof of the present invention.
[0093] (1) Preparation of three-porous silica carrier
[0094] Water glass with a concentration of 13% by weight, sulfuric acid solution with a concentration of 15% by weight, cetyltrimethylammonium bromide and n-butanol were mixed in a weight ratio of 4:1.2:0.9:1 and heated at 25°C The contact reaction was carried out for 1.6 h, and then the pH value was adjusted to 3.5 with sulfuric acid with a concentration of 98% by weight, and then the obtained reaction mass was suction filtered and washed with distilled water until the sodium ion content was 0.02% by weight to obtain a silica gel filter cake.
[0095] Put 10g of the above-prepared silica gel filter cakes together into a 100mL ball mill jar, wherein the ball mill jar is made of polytetrafluoroethylene, the material of the grinding balls is agate, ...
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