FIELD: organic chemistry. SUBSTANCE: charge raw mixture containing 14-40 volume % of methane, 4-20 volume % of oxygen and 50-80 volume % of water vapor is contacted with catalyst system of formula LanMemOp, wherein Me is Mg, Ca, Sr or Ba; n= 0.6-2.0; m= 9.0-9.7; p = 10.6-12.0, provided that Me is Ca, n≠ 1, m≠ 9.5, p≠ 11. EFFECT: high selectivity and concentration of ethylene in reaction mixture. 1 tbl
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