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(a) XRD patterns of the oyster shell catalyst before and after calcination at 1000 °C for 5 h. (b) SEM image of oyster shell after calcination. (c) EDS spectrum of calcined oyster shell showing the presence of C, O, Na, Mg, Al, Si, Pt, and Ca. Note that the inset of (c) displays the magnified region in (b).
