Synthesis of Ni-Spinel/Aluminosilicate Composite Ceramics Mixed at Nanoscale Level by Using Zeolite Precursors
2000
Thermally induced phase transformation of Ni-exchanged LTA, FAU, GIS and MOR zeolites were studied in the temperature range from room to 1500°C. All investigated zeolite frameworks collapsed into amorphous intermediate products after heating between 800-900°C. Prolonged heating of the intermediate products obtained from the Ni-exchanged zeolites over 900°C, induces recrystallization of Ni-spinel phase (cubic-NiAl 2 O 4 ) in all cases whereas silicate part recrystallizes into Ni-stuffed derivative phase of cristobalite (at Ni-GIS and Ni-MOR zeolite) or stay amorphous. Phase composition of ceramic products were studied by XRPD, SEM and IR techniques.
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