Catalytic activity of Ru/La1.6Ba0.4NiO4 perovskite-like catalyst for NO plus CO reaction: Interaction between Ru and La1.6Ba0.4NiO4

In this paper, the activity of La1.6Ba0.4NiO4 (LBN) and Ru/La1.6Ba0.4NiO4 (Ru/LBN) perovskite-like catalysts was investigated for NO + CO reaction. Meanwhile, Ru/LBN exhibited much higher activity than LBN. The catalysts were fully characterized by means of XRD, elemental analysis, N-2-physisorption, H-2-TPR, XPS, O-2-TPD, NO-TPD and CO-TPD. These results demonstrated that the excellent catalytic performance of Ru/LBN catalyst was associated with the strong interaction between Ru and LBN, leading to enhancing reducibility and mobility of oxygen species and increasing the amount of the surface adsorbed oxygen. In addition, the amount of adsorbed CO and NO increased largely for Ru/LBN. And Ru3+ species on the surface of Ru/LBN was considered as an effective active site for NO + CO reaction. In-situ DRIFTS was used for studying the relationship between catalytic activity and NO, CO adsorption ability, species and sites. The results indicated that the new active species were formed on the surface of Ru/LBN compared with LBN including inorganic carboxylate, monodentate carbonate, Ru-NO, bridged nitrate and nitrite. (C) 2017 Elsevier B.V. All rights reserved.