Modified supported catalyst as well as preparation method and application thereof
A supported catalyst and modification technology, applied in the field of polyethylene polymerization catalysts, can solve the problems of titanium source polluting the environment, cumbersome steps, etc., and achieve the effects of improving the content and distribution, high activity, and sensitive hydrogen responsiveness.
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[0031] The invention provides a preparation method of a modified supported catalyst, the preparation method comprising: impregnating an inorganic carrier with a solution containing a chromium precursor, a vanadium precursor and a titanium precursor, drying and roasting to obtain a modified supported catalyst ;
[0032] Wherein, the titanium precursor is potassium titanium oxalate and / or ammonium titanium oxalate.
[0033]In the preparation process of the catalyst of the present invention, chromium and vanadium are added as active components, and titanium is added as a modified component. The catalyst of the present invention uses titanium potassium oxalate and / or titanium ammonium oxalate as the titanium source, which can overcome the various defects of other titanium sources in the prior art. Corrosive gas, pollutes the environment, and requires high equipment; tetra-n-butyl titanate is used as the titanium source, which needs to be impregnated in an organic solvent, and can...
Embodiment 1
[0073] A certain amount of potassium titanium oxalate, ammonium metavanadate and basic chromium acetate (the ratio of the amount of substances of titanium potassium oxalate, ammonium metavanadate and basic chromium acetate is 3:1:1, and the loading capacity of titanium is 1.5 wt%, the loading capacity of chromium is 0.5wt%) dissolved in water, stirred at 60°C for 6h, added 10g of silica gel (the pore volume is 1.5-1.7cm 3 / g, the surface area is 250-300m 2 / g), the solution temperature was maintained at 60°C and stirred for 4h, then heated to 120°C and dried for 5h, then transferred to a 120°C oven for 6h; the impregnated silica gel carrier was transferred to a quartz fluidized bed for roasting and activation, and firstly heated at 150°C under nitrogen Calcined under ambient conditions for 1 hour, then raised the temperature to 500°C, switched the gas phase to high-purity air for 4 hours, and then cooled and transferred naturally under the protection of nitrogen to obtain the ...
Embodiment 2
[0075] A certain amount of titanium ammonium oxalate, ammonium metavanadate and basic chromium acetate (the ratio of the amount of titanium ammonium oxalate, ammonium metavanadate and basic chromium acetate is 3:2:1, and the loading capacity of titanium is 1.5 wt%, the loading capacity of chromium is 0.5wt%) dissolved in water, stirred at 60°C for 6h, added 10g of silica gel (the pore volume is 1.5-1.7cm 3 / g, the surface area is 250-300m 2 / g), the solution temperature was maintained at 60°C and stirred for 4h, then heated to 120°C and dried for 5h, then transferred to a 120°C oven for 6h; the impregnated silica gel carrier was transferred to a quartz fluidized bed for roasting and activation, and firstly heated at 150°C under nitrogen Calcined under ambient conditions for 1 hour, then raised the temperature to 500°C, switched the gas phase to high-purity air for 4 hours, and then cooled and transferred naturally under the protection of nitrogen to obtain the catalyst for sto...
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Abstract
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