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