FIELD: redox reaction catalysts. SUBSTANCE: selective decomposition of N2O in nitrose gas mixture is effected in presence of catalyst consisting of porous ceramic support and catalytically active phase, said support consisting at least to 95% of one or more alkali-earth metal compounds. Proposed catalyst is preferably applicable in nitric acid production process. EFFECT: increased catalytic activity and enabled use of catalyst within temperature range 700 to 1000 C without loss in catalytic properties. 9 cl, 6 dwg, 9 ex
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