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