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Synthesis of High Surface Area CoAl2O4 and NiAl2O4 Spinels By an Alkoxide Route

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The mixed metal oxides CoAl2O4 and NiAl2O4 were prepared in a high surface area form by using a sol-gel method which involves hydrolysis of cobalt-aluminium and nickel-aluminium isopropoxides. The resulting gels were calcined at 673 K to yield the corresponding spinel-type metal oxides. Powder X-ray diffraction was used to confirm spinel formation. Nitrogen adsorption-desorption measurements have shown the materials obtained to be highly porous. The BET surface area was found to be 240 m2g-1 for CoAl2O4 and 255 m2g-1 for NiAl2O4. Both materials showed a unimodal distribution of pore radii, where the most frequent pore radius is 5 nm for cobalt aluminate and 3 nm for nickel aluminate.

Affiliations: 1: Departamento de Quimica, Universidad de las Islas Baleares, Palma de Mallorca, Spain; 2: Instituto Nacional del Carbón, CSIC, Oviedo, Spain


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