STUDY OF THE CATALYSTS OF FUEL COMBUSTION .17. EFFECT OF LANTHANUM AND CERIUM ON STRUCTURAL AND MECHANICAL-PROPERTIES OF ALUMINA

The structural and mechanical properties of alumina modified with La a nd Ce ions were studied at different temperatures (873-1573 K) and con tents of additives. The maximum stabilization effect on the specific s urface area (S-sp) was observed at 1173-1473 K with the addition of 5 wt % La2O3. The stabilization of the porous structure of modified samp les takes place at T > 1173 K. The mechanical strength of granules inc orporating lanthanum and cerium ions increased with temperature. The r esults obtained allow one to determine the relationships between previ ous data on the influence of lanthanum and cerium ions on the polymorp hous transformations in alumina dependent on the conditions of thermal treatment, the structure, and mechanical properties of modified alumi na.