HETERONUCLEAR HYDROXO COMPLEXES OF AL(III), REM AND SOME 3D-METALS

In a number of cases the activity of hydroxide and oxide catalysts rec eived from coprecipitation method is not equal to the total activity o f mixed hydroxides or oxides. Assumption that heteronuclear hydroxides could be formed by coprecipitation of metal hydroxides was stated. In the case of rare-earth and two charged 3d-metal ions it was shown tha t heteronuclear hydroxo complexes can be formed by interaction of thes e metal ions at initial stages of their cohydrolysis under certain con ditions. In some cases these complexes are destroyed with time. Such h eteronuclear hydroxo complexes are new compounds and can show high cat alytic activity owing to features of their structure. Highly effective oxide catalysts can be produced by thermal decomposition on the basis of these heteronuclear hydroxides. (C) 1998 Elsevier Science B.V. All rights reserved.