FIELD: catalytic chemistry. SUBSTANCE: proposed catalyst is prepared by self-propagating high temperature synthesis, exothermic mixture being used. Mentioned above mixture contains (mass %): Mg 8-15, Cr2O3 9-15; CrO3 26-30, Al2O3 18-23, MgO 25-30, active phase 33-45, magnesium oxides and aluminium oxides 55-67. Said active phase contains 80-92 mass % of spinel compound having formula MaM2O4 where M is Al or Cr. EFFECT: improves quality of desired product. 1 tbl
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