CATALYST, PREPARATION METHOD THEREOF AND AMMONIA OXIDATION METHOD Russian patent published in 2011 - IPC B01J23/83 B01J23/70 B01J23/78 B01J23/80 B01J37/02 C01B21/26 B01D53/56 

FIELD: chemistry.

SUBSTANCE: invention relates to catalysts and ammonia oxidation processes. Described is a catalyst for oxidation of ammonia to NO and NO₂ and decomposition of NO₂ for use as the second step of a two-step catalyst system which is formed using various methods, as well as in a set with platinioid meshes, trapping meshes and/or inert filling, under Ostwald process conditions at 800-920°C and pressure 1-9 bars, as well as under ammonia slip conditions, which is a block carrier with a cellular structure containing an aluminium, cerium, zirconium or titanium oxide with a deposited active component, where the carrier has open transport pores with size 300-2000 Å, where the volume of such pores is not less than 0.25 cm³/g, the active component has the formula La_yM¹ _1-xM² _xO_z, where: M¹ is selected from a group consisting of Fe, Mn, Co; M² - Co, Cu, Ni, Zn, Mg; x=0-0.4, y=0-0.99, z=2; M¹ is selected from a group consisting of Fe, Mn, Co; M² - Co, Cu, Ni, Zn, Mg; x=0-0.4, y=0-0.99, z=2-4. Described is a method of preparing the catalyst by mixing powder of an aluminium, cerium, zirconium or titanium oxide with particle characteristic size of 5-100 mcm with any of the commonly used inorganic binding materials based on aluminium oxide, water, acid, plasticising and high-temperature combustible additives, and the active component is deposited on the carrier via saturation with aqueous solutions containing polymerised ester precursors of the active component. The invention also describes the process of oxidising ammonia under Ostwald process conditions at 800-920°C and pressure 1-9 bars, as well as under ammonia slip conditions using the catalyst described above.

EFFECT: preparation of an active and thermally stable catalyst for oxidising ammonia and decomposing nitrogen oxide under Ostwald process conditions in the temperature range 800-1000°C and pressure 0,9-9 bars.

10 cl, 11 ex, 4 tbl, 1 dwg