Using the catalyst preparation procedures set forth in U.S. Pat Nos. 3,957,689 and 4,458,023, {HEAD ~ catalysts} of the present invention are obtained which are attrition resistant and particularly suited for use in {TAIL ~ commercial FCC operations} 
Using the catalyst preparation procedures set forth in U.S. Pat Nos . 3,957,689 and 4,458,023 , { HEAD ~ catalysts } of the present invention are obtained which are attrition resistant and particularly suited for use in { TAIL ~ commercial FCC operations }
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