The method 1 further comprising regenerating {TAIL ~ the cerium promoted zeolite catalyst} to a predetermined level to form {HEAD ~ a regenerated cerium promoted catalyst} 
The method 1 further comprising regenerating { TAIL ~ the cerium promoted zeolite catalyst } to a predetermined level to form { HEAD ~ a regenerated cerium promoted catalyst }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD