FIELD: petrochemical process catalysts. SUBSTANCE: methane conversion catalyst containing nickel oxide 3.7-16.0%, and lanthanum oxide 0.1-4.1% deposited on alumina-magnesium oxide support additionally contains zirconium dioxide 0.1-2.2%. Support is shaped as three-leaved figure with three cylindrical holes having equal wall cross-section thickness. Synthesis gas is prepared in presence of this catalyst at temperatures within 750-950 C. EFFECT: increased catalyst life time and increased degree of active component utilization. 3 cl, 1 dwg, 1 tbl, 10 ex
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