The Effect of the Nature of the Support on Catalytic Properties of Ruthenium Supported Catalysts in Partial Oxidation of Methane to Syn-Gas

摘要

The effect of the carrier on catalytic properties of ruthenium supported catalysts in partial oxida-tion of methane (POM) was investigated. A variety of supports differed in texture and reducibility (Al_2O_3, SiO_2, TiO_2, Cr_2O_3, CeO_2 and Fe_2O_3) were used. The catalyst activity is governed by ruthenium phase forma-tion (RuO_2 → Ru_0), and it depends on redox properties of the support as well as support–ruthenium phase inter-action. The activity of Ru supported catalysts decreases in the order Al_2O_3 ≈ SiO_2 > Cr_2O_3 > TiO_2 > CeO_2 > Fe_2O_3. No significant effects of the specific surface area and porosity of catalysts on the methane conversion and selectivity of CO formation were found. The selectivity of CO_2 formation (total oxidation of CH4) under con-ditions of POM (a ratio of CH_4/O_2 = 2) is associated with the contribution of reducible support oxides into the catalytic performance.