Highly efficient and stable Ru/K-OMS-2 catalyst for NO oxidation

Publication date: 15 December 2017
Source:Applied Catalysis B: Environmental, Volume 219
Author(s): S. Adjimi, J.M. García-Vargas, J.A. Díaz, L. Retailleau, S. Gil, M. Pera-Titus, Y. Guo, A. Giroir-Fendler
The influence of addition of a series of non noble and noble metals to a manganese oxide octahedral molecular sieve (OMS) with a cryptomelane structure (K-OMS-2) has been studied for NO oxidation in view of fast selective catalytic reduction applications. Fe, Cu, Zn, Pt, Pd, Ru and Ag were selected as dopant metals with a metal loading around 2wt.%. The catalysts were characterized in detail by ICP-OES, N2 adsorption/desorption at 77K, XRD, H2-TPR and HR-TEM. The highest NO conversion was obtained for a K-OMS-2 catalyst modified with ruthenium, showing a reaction rate up to 5.3μmolg⁻¹s⁻¹ at 584K. A markedly higher catalyst reducibility upon incorporation of ruthenium can be proposed as an underlying reason for the enhanced catalytic performance.

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