The catalyst 1, wherein CR2 O3 and {HEAD ~ Al2 O3} are directly deposited on {TAIL ~ the Zn ZSM 5 zeolite} or the Zn ZSM 5 zeolite/asbestos 
The catalyst 1 , wherein CR2 O3 and { HEAD ~ Al2 O3 } are directly deposited on { TAIL ~ the Zn ZSM 5 zeolite } or the Zn ZSM 5 zeolite / asbestos
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH