INVESTIGATION OF THE CATALYSTS OF FUEL COMBUSTION REACTIONS .16. THERMAL-STABILITY OF CU-CR LA2O3-AL2O3 AND CU-CR/CEO2-AL2O3 SYSTEMS/

The thermal stability of an alumina support, which is promoted by lant hanum and cerium ions, in supported systems containing copper oxide, c hromium oxide, and mixed copper-chromium oxide is studied by the x-ray diffraction method. Both lanthanum and cerium decrease the mineralizi ng influence of supported active components. In order to improve the t hermal stability of the alumina support, a stabilizing ion introduced into Al2O3 should not only impede dissolution of an active component i n the support (thus lowering the mineralization effect), but also form stable high-temperature compounds with the support, which give no alp ha-Al2O3 upon their destruction.