The dependency on morphology is crucial for achieving highly efficient direct decomposition of NO. Herein, a BaCoO/CeO catalyst is synthesized using CeO small particles (p), spheres (s) and rods (r) as supports. The NO conversion to N (NTN2) at 800 °C follows the order BaCoO/CeO-r (78.8 %) > BaCoO/CeO-s (75.9 %) > BaCoO/CeO-p (56.9 %) > BaCoO (8.6 %) at a space velocity 1 g s/cm. BaCoO/CeO-r exhibts high tolerance to O and stability with conversion decreasing from 78.8 % to 74.6 %, 60.0 % and 50.0 % at 800 °C with 1, 5 and 10 vol% O, respectively. The high redox activity, higher active oxygen mobility and NO adsorption capability ensures its superior performance, while the high surface area (31.29 m/g) and uniform distribution of active sites on the surface further promote the activity. The mechanism of NO direct decomposition is elucidated by Diffuse reflectance infrared Fourier transform spectroscopy, O isotopic transient exchange experiments and density functional theory (DFT) calculation.

中文翻译：

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BaCoO3/CeO2催化剂NO直接分解的独特构效关系和反应机理

对形态的依赖性对于实现 NO 的高效直接分解至关重要。在此，使用CeO小颗粒(p)、球体(s)和棒体(r)作为载体合成BaCoO/CeO催化剂。 800 °C 时，NO 转化为 N (NTN2) 的顺序为 BaCoO/CeO-r (78.8 %) > BaCoO/CeO-s (75.9 %) > BaCoO/CeO-p ​​(56.9 %) > BaCoO (8.6 %)空速为 1 gs/cm。 BaCoO/CeO-r 表现出对 O 的高耐受性和稳定性，在 800 °C、1、5 和 10 vol% O 的情况下，转化率分别从 78.8 % 降至 74.6 %、60.0 % 和 50.0 %。高氧化还原活性、较高的活性氧迁移率和NO吸附能力确保了其优越的性能，而高比表面积（31.29 m/g）和表面活性位点的均匀分布进一步促进了其活性。通过漫反射红外傅里叶变换光谱、O同位素瞬态交换实验和密度泛函理论（DFT）计算阐明了NO直接分解的机理。