US 12,304,975 B2
Chromium-on-silica catalysts and methods of making the same
Yatao Rachel Hu, Malvern, PA (US); Parag Rasiklal Shah, Lafayette Hill, PA (US); David George Collopy, Cheshire (GB); Robert Joseph Parker, Cheshire (GB); and Myoung Kie Lee, King of Prussia, PA (US)
Assigned to ECOVYST CATALYST TECHNOLOGIES LLC, Malvern, PA (US)
Filed by Yatao Rachel Hu, Malvern, PA (US); Parag Rasiklal Shah, Lafayette Hill, PA (US); David George Collopy, Cheshire (GB); Robert Joseph Parker, Cheshire (GB); and Myoung Kie Lee, King of Prussia, PA (US)
Filed on Jul. 21, 2023, as Appl. No. 18/356,285.
Application 18/356,285 is a division of application No. 16/804,610, filed on Feb. 28, 2020, granted, now 11,732,065.
Prior Publication US 2023/0365725 A1, Nov. 16, 2023
Int. Cl. C08F 10/02 (2006.01)
CPC C08F 10/02 (2013.01) 23 Claims
OG exemplary drawing
 
1. An ethylene polymerization catalyst composition comprising:
a silica-containing substrate derived from a base-set gel, the silica-containing substrate comprising:
a catalytically active metal comprising Cr;
Al in an amount of less than 50 ppm of said catalyst composition; and
Na in an amount of less than 800 ppm of said catalyst composition.