NEW YORK, May 28 (Reuters) - Exxon Mobil's XOM.N 250,000 barrel-per-day refinery in Joliet, Illinois brought the catalytic cracker unit back to full capacity, IIR Energy said on Thursday.

The refinery ran its 98,000-bpd catalytic cracker unit at approximately 50% capacity after experiencing unspecified mechanical issues last week.

A spokesperson at Exxon Mobil did not respond to a request for comment.

(Reporting by Nicole Jao in New York)

((Nicole.Jao@thomsonreuters.com; Twitter/X: @ByNicoleJao; +1 646 540 2216;))