Abstract
The surface properties of pure alumina and its calcination products and of alumina-chromia mixed gels calcined in the temperature range 300–750 °C were studied by the adsorption of nitrogen at -195 °C. The surface areas, micropore volumes and the pore volume distributions were evaluated for the calcination products. With the rise of calcination temperature above 500 °C, the surface areas decreased considerably while the mean pore radius increased. Sintering at temperatures higher than 500 °C resulted in pore widening. Chromia inhibited the sintering of alumina when present in amounts of 5 or 15 mol.%.
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