ConocoPhillips will restart on Friday an unspecified unit at its 247,000-barrel-per-day refinery in Sweeny, Texas, it said in a filing late Thursday with state regulators.

Unit 11 will be starting up following a recent scheduled catalyst change-out, the company said in a notice to the Texas Commission on Environmental Quality which only identified the unit by its number.

Company officials were not immediately available for comment. (Reporting by Haitham Haddadin; Editing by John Picinich)