Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, Yunnan, China.
College of Resources and Environment, Chengdu University of Information Technology, Chengdu, 610225, Sichuan, China.
Environ Sci Pollut Res Int. 2021 Feb;28(6):6929-6940. doi: 10.1007/s11356-020-10993-9. Epub 2020 Oct 3.
Perovskite is an efficient and emerging catalyst for NO oxidation. In this study, BaMnO and BaCoO perovskite catalysts were synthesized by the sol-gel method, and their catalytic oxidation performances of NO were studied. The catalytic performances indicated that BaMnO and BaCoO 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 BaMnO and BaCoO perovskite catalysts were related to the abundant surface adsorption oxygen (O = 76.21% and 78.57%, respectively) and the high concentration of Mn (Mn/Mn = 66.95%) and Co (Co/Co = 63.8%). Moreover, the results of FT-IR and kinetics revealed that NO and O 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 NO. 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 BaMnO and 30.081 kJ/mol for BaCoO, implying that BaMnO and BaCoO provide low-cost and efficient catalysts, which can be comparable to Pt noble metal catalysts.
钙钛矿是一种高效且新兴的 NO 氧化催化剂。本研究采用溶胶-凝胶法合成了 BaMnO 和 BaCoO 钙钛矿催化剂，并研究了它们对 NO 的催化氧化性能。催化性能表明，BaMnO 和 BaCoO 钙钛矿在 350°C 时的 NO 转化率分别高达 78.2%和 84.3%，具有最高的 NO 氧化活性。BaMnO 和 BaCoO 钙钛矿催化剂具有高活性，与丰富的表面吸附氧（O=76.21%和 78.57%）和高浓度的 Mn（Mn/Mn=66.95%）和 Co（Co/Co=63.8%）有关。此外，FT-IR 和动力学结果表明，NO 和 O 吸附在样品表面并与 B-O 带结合，形成双齿硝酸盐和桥接硝酸盐，最终转化为 NO。动力学分析表明，NO 氧化反应遵循 Eley-Rideal（E-R）和 Langmuir-Hinshelwood（L-H）机制。此外，BaMnO 的活化能为 36.453 kJ/mol，BaCoO 的活化能为 30.081 kJ/mol，这表明 BaMnO 和 BaCoO 提供了低成本、高效的催化剂，可以与 Pt 贵金属催化剂相媲美。
