Oxidative conversion of methane on structured catalysts Ni–Al2O3/cordierite

Abstract

There is presentation of results of studies of the catalytic properties Ni/Al2O3 composites deposited on the ceramic honeycomb structure of the synthetic cordierite matrix block, in the oxidative conversion of methane. The tests of the pre-reduced catalyst were carried out in the flow type reactor (composition of the reaction mixture during the oxidation of methane 2–6 % CH4, 2–9 % O2 and Ar, with carbon dioxide and oxy carbon dioxide conversion of methane 2–6 % CH4, 6–12 % CO2, 0–4 % O2 and Ar). Physicochemical studies included a control of carbon formation and the oxidation, bond strength of Ni–O, the phase composition of samples on a diffractometer HZG-4C. The authors have shown that structured Ni–Al-catalysts are significantly higher than traditional granular contacts in catalytic performance in carbon dioxide conversion of methane. Increase of the stability of their performance is achieved by regulation of acid-base properties of the surface with the introduction of alkali metal oxide (Na, K), due to the slowdown of surface cocking. Established that the oxides of rare-earth metals with a low redox potential (La2O3, CeO2) increases the activity and stability of the Ni–Al2O3/cordierite catalysts in the reactions of deep and partial oxidation of carbon dioxide and methane conversion. In the presence of a catalyst (NiO + La2O3 + Al2O3)/cordierite the carbon dioxide methane conversion process can be intensified by oxygen introducing into the reaction gas mixture, which leads to lower of temperatures to achieve high conversion and no effect on the selectivity of H2.