Abstract
Catalysts based on Mn-substituted cordierite 2MnO · 2Al2O3 · 5SiO2 have been synthesized using different manganese oxides (MnO, Mn2O3, and MnO2) at a calcination temperature of 1100°C. The catalysts differ in their physicochemical properties, namely, phase composition (cordierite content and crystallinity), manganese oxide distribution and dispersion, texture, and activity in high-temperature ammonia oxidation. The synthesis involving MnO yields Mn-substituted cordierite with a defective structure, because greater part of the manganese cations is not incorporated in this structure and is encapsulated and the surface contains a small amount of manganese oxides. This catalyst shows the lowest ammonia oxidation activity. The catalysts prepared using Mn2O3 or MnO2 are well-crystallized Mn-substituted cordierite whose surface contains different amounts of manganese oxides differing in their particle size. They ensure a high nitrogen oxides yield in a wide temperature range. The product yield increases with an increasing surface concentration of Mn3+ cations. The highest NO x yield (about 76% at 800–850°C) is observed for the MnO2-based catalyst, whose surface contains the largest amount of manganese oxides.
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Original Russian Text © E.F. Sutormina, L.A. Isupova, L.M. Plyasova, L.S. Dovlitova, N.A. Rudina, V.A. Rogov, 2016, published in Kinetika i Kataliz, 2016, Vol. 57, No. 2, pp. 250–258.
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Sutormina, E.F., Isupova, L.A., Plyasova, L.M. et al. Effect of the oxidation state of manganese in the manganese oxides used in the synthesis of Mn-substituted cordierite on the properties of the product. Kinet Catal 57, 255–262 (2016). https://doi.org/10.1134/S0023158416020142
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DOI: https://doi.org/10.1134/S0023158416020142