Processes for producing fluorided solid oxides and uses thereof in metallocene-based catalyst systems
Disclosed herein are methods for preparing fluorided solid oxides by contacting an acidic fluorine-containing compound with an inorganic base to form an aqueous mixture having a pH of at least 4, followed by contacting a solid oxide with the aqueous mixture to produce the fluorided solid oxide. Also disclosed are methods for preparing fluorided solid oxides by contacting an acidic fluorine-containing compound with a solid oxide to produce a mixture, followed by contacting the mixture with a inorganic base to produce the fluorided solid oxide at a pH of at least about 4. The fluorided solid oxide can be used as an activator component in a catalyst system for the polymerization of olefins.
1 . A fluorided solid oxide comprising:
a solid oxide comprising an alumina, a silica-alumina, a silica-coated alumina, an alumina-boria, or any combination thereof,
from about 0.5 to about 15 wt. % F,
from about 0.5 to about 15 wt. % Zn, and
from about 0.2 to about 1.2 wt. % B.
2 . The fluorided solid oxide of claim 1 , wherein the fluorided solid oxide has:
a total pore volume from about 0.5 to about 2.5 mL/g;
a BET surface area from about 150 to about 700 m 2 /g; and
an average (d50) particle size from about 10 to about 100 microns.
3 . The fluorided solid oxide of claim 2 , wherein the fluorided solid oxide comprises from about 2 to about 9 wt. % F.
4 . The fluorided solid oxide of claim 3 , wherein the solid oxide comprises the alumina.
5 . The fluorided solid oxide of claim 2 , wherein the fluorided solid oxide comprises from about 0.5 to about 5 wt. % Zn.
6 . The fluorided solid oxide of claim 5 , wherein the solid oxide comprises the silica-alumina.
7 . The fluorided solid oxide of claim 1 , wherein the solid oxide comprises the silica-alumina.
8 . The fluorided solid oxide of claim 1 , wherein the fluorided solid oxide comprises:
from about 3 to about 7 wt. % F;
from about 1 to about 5 wt. % Zn; and
from about 0.3 to about 1 wt. % B.
9 . The fluorided solid oxide of claim 8 , wherein the fluorided solid oxide has:
a total pore volume from about 0.5 to about 2.5 mL/g;
a BET surface area from about 150 to about 700 m 2 /g; and
an average (d50) particle size from about 10 to about 100 microns.
10 . The fluorided solid oxide of claim 9 , wherein the solid oxide comprises the alumina.
11 . The fluorided solid oxide of claim 9 , wherein the solid oxide comprises the silica-alumina.
12 . The fluorided solid oxide of claim 8 , wherein:
the fluorided solid oxide comprises Zn(BF 4 ) 2 .
13 . The fluorided solid oxide of claim 12 , wherein the fluorided solid oxide has:
a total pore volume from about 0.5 to about 2.5 mL/g;
a BET surface area from about 150 to about 700 m 2 /g; and
an average (d50) particle size from about 10 to about 100 microns.
14 . The fluorided solid oxide of claim 1 , wherein the fluorided solid oxide comprises ZnSiF 6 .
15 . The fluorided solid oxide of claim 1 , wherein the fluorided solid oxide comprises Zn(BF 4 ) 2 .
16 . The fluorided solid oxide of claim 1 , wherein the fluorided solid oxide comprises from about 4 to about 10 wt. % Zn(BF 4 ) 2 .
17 . A fluorided solid oxide comprising:
a solid oxide;
from about 0.5 to about 15 wt. % F,
from about 0.5 to about 15 wt. % Zn, and
from about 0.2 to about 1.2 wt. % B,
wherein the fluorided solid oxide comprises Zn(BF 4 ).