Structural Study of Gamma Alumina (?-Al2O3) and ? Co-Crystalline Zeolite

Abstract

The effect of preparation by ion exchange method and impregnation aqueous Hexachloroplatine acid (40 wt. % Pt) on structural changes were studied. Two synthetic zeolites of different compositions were prepared by ion exchange using (NH4CL) and calcinations at 350? for 2hr. Then subsequently loaded with 0.5 wt. % Pt by impregnations with aqueous hexachloroplatine acid (H2PtCl6.6H2O) and calcinations and reduced with hydrogen. The compositions analyzed before preparation by X-ray Florence (XRF) and X-ray Diffraction (XRD) and then analyzed after preparation via Scanning Electronic Microscopy (SEM). The morphology and average crystallite size of ?-Al2O3 was 7�m, while for ? Co-Crystalline Zeolite was 8.5�m. Platinum particles were found to be homogeneously distributed and the crystallite faujasite size range (5-10) �m. When analyzed via Energy Dispersive X-ray (EDAX) they agree well with (XRD) and zeolite composition, and analyzed via Brunauer Emmett Teller (BET) the results of Surface Area m2/mg giving the highest values equivalent 288.86m2/mg and 427.98m2/mg for Pt/H-?-Al2O3 and Pt/ H-? Co-Crystalline Zeolite respectively and Pore Volume cm3/gm equivalent 0.3199cm3/gm and 0.6603cm3/gm respectively