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Nanosized platinum metal particles in zeolite NaA have been prepared by four different methods, namely, (I) γ-radiolysis of zeolite A sample exchanged with [Pt(NH 3 ) 4 ] 2+ , (II) γ-radiolysis of precursor gel containing Pt 2+ ions followed by hydrothermal crystallisation to form zeolite A, (III) hydrogen reduction of Pt 2+ ions containing precursor...
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