THE STUDY OF COMPOSITION OF NOVEL HIGH-TEMPERATURE CATALYSTS FOR OXIDATIVE CONVERSION OF METHANE

The products of lignite and coal combustion were tested as the catalys ts in two reactions of the oxidative conversion of methane: deep oxida tion and oxidative coupling of methane (OCM). It has been observed tha t these products may display a good performance in either deep oxidati on and OCM depending on reaction conditions - temperature and oxygen p artial pressure. The detailed study of the composition of products obt ained was carried out. It was established that the products are the gl ass-crystal microspheres with the content of crystal phase of 86-90 wt % and glass phase of 10-14%. The crystal phase consists of the complex solid solution with spinel structure based on magnetite (FeFe2O4) wit h Mg and Mn spinels (MgFe2O4, MnFe2O4) and small concentration of hema tite Fe2O3. The basis of glass phase is calcium aluminosilicates. The active components which are responsible for the reaction proceeding ov er both routes are considered, (C) 1998 Elsevier Science B.V. AU right s reserved.