For this particular reason, the expression {TAIL ~ “Si/Al elemental ratio} of {HEAD ~ the zeolitic phase}” is being used throughout 
For this particular reason , the expression { TAIL ~ “ Si / Al elemental ratio } of { HEAD ~ the zeolitic phase } ” is being used throughout
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH