NO oxidation performance and kinetics analysis of BaMO 3 (M=Mn, Co) perovskite catalysts
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RESEARCH ARTICLE
NO oxidation performance and kinetics analysis of BaMO3 (M=Mn, Co) perovskite catalysts Ran Ao 1 & Liping Ma 1 & Zhiying Guo 1 & Jing Yang 1 & Liusen Mu 1 & Jie Yang 2 & Yi Wei 1 Received: 23 June 2020 / Accepted: 25 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Perovskite is an efficient and emerging catalyst for NO oxidation. In this study, BaMnO3 and BaCoO3 perovskite catalysts were synthesized by the sol-gel method, and their catalytic oxidation performances of NO were studied. The catalytic performances indicated that BaMnO3 and BaCoO3 perovskites had the highest NO oxidation activities with the NO conversions of 78.2% at 350 °C and 84.3% at 310 °C, respectively. The high activities of BaMnO3 and BaCoO3 perovskite catalysts were related to the abundant surface adsorption oxygen (OA = 76.21% and 78.57%, respectively) and the high concentration of Mn4+ (Mn4+/Mn = 66.95%) and Co3+ (Co3+/Co = 63.8%). Moreover, the results of FT-IR and kinetics revealed that NO and O2 adsorbed on the surface of samples and combined with the B-O band to form bidentate nitrate and bridging nitrate, which eventually was converted into NO2. The kinetics analysis revealed that the NO oxidation reaction followed the Eley-Rideal (E-R) and Langmuir-Hinshelwood (L-H) mechanisms. In addition, the activation energies were 36.453 kJ/mol for BaMnO3 and 30.081 kJ/mol for BaCoO3, implying that BaMnO3 and BaCoO3 provide low-cost and efficient catalysts, which can be comparable to Pt noble metal catalysts. Keywords NO oxidation . BaMnO3 . BaCoO3 . Kinetics
Introduction Nitrogen oxides (NOx) are one of the primary pollutants that cause the air pollution. Nitric oxide (NO) is one of the main NOx and accounts for 90–95% of NOx (Wang et al. 2016). The production of NOx has led to numerous environmental hazards, such as photochemical smog, acid rain, and the greenhouse effect, that have harmed the environment and human health (Fu et al. 2016; Xiong et al. 2015). Therefore, Responsible Editor: Santiago V. Luis Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-10993-9) contains supplementary material, which is available to authorized users. * Liping Ma [email protected] 1
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, Yunnan, China
2
College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, Sichuan, China
various technologies, such as selective catalytic reduction (SCR) (Hauff et al. 2013; Wang et al. 2019b), NOx storage/ reduction (NSR) (Skalska et al. 2010), lean NOx trap (LNT) (Zhong et al. 2015), and catalytic oxidation (Li et al. 2019), have been used to control NOx emissions. Previous studies have shown that the oxidation of NO to NO2 is the key step in the NSR, LNT, and catalytic oxidation reactions (Forzatti et al. 2009; Olsson and Karlsson 2009). The reduction of NOx reached its highest efficiency in the SCR process when
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