Where the materials of {TAIL ~ the invention} are silicoaluminophosphates, they typically have {HEAD ~ a silica} to alumina molar ratio from about 0.10 to about 0.60, preferably from about 0.15 to about 0.50 
Where the materials of { TAIL ~ the invention } are silicoaluminophosphates , they typically have { HEAD ~ a silica } to alumina molar ratio from about 0.10 to about 0.60 , preferably from about 0.15 to about 0.50
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH