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基于实际运行条件下催化燃烧的用于甲烷检测的CeO:MnO催化微转换器

CeO:MnO Catalytic Micro-Converters Tuned for CH Detection Based on Catalytic Combustion under Real Operating Conditions.

作者信息

Simion Cristian E, Florea Ovidiu G, Florea Mihaela, Neaţu Florentina, Neaţu Ştefan, Trandafir Mihaela M, Stănoiu Adelina

机构信息

National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania.

出版信息

Materials (Basel). 2020 May 11;13(9):2196. doi: 10.3390/ma13092196.

DOI:10.3390/ma13092196
PMID:32403264
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7254370/
Abstract

Mesoporous CeO:MnO materials (3:7 and 7:3 molar ratio) were prepared by co-precipitation and deposited as porous thick films over alumina (AlO) planar substrate provided with Pt meander. The aim was oriented towards detecting low levels methane (CH) at moderate operating temperatures. Herein we demonstrated that the sensitivity of catalytic micro-converters (CMCs) towards a given peak of CH concentration corresponds to specific gas-surface interaction phenomena. More precisely, a transition from thermal conductivity to combustion rate is likely to occur when CMCs are operated under real atmospheric conditions (normal pressure, presence of relative humidity, and constant operating temperature). The response to CH was analyzed over different gas flows and different gas concentrations under the same operating regime. The materials were fully characterized by adsorption-desorption isotherms, H-Temperature Programmed Reduction (H-TPR), X-ray Diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Scanning Electron Microscopy (SEM), and Raman spectroscopies. Thus, the applicative aspect of using CeO:MnO as moderate temperature CMC for CH detection is brought to the fore.

摘要

通过共沉淀法制备了介孔CeO:MnO材料（摩尔比为3:7和7:3），并以多孔厚膜的形式沉积在带有铂曲折线的氧化铝（Al₂O₃）平面基板上。目的是在中等操作温度下检测低浓度的甲烷（CH₄）。在此，我们证明了催化微转换器（CMC）对给定CH₄浓度峰值的灵敏度对应于特定的气-表面相互作用现象。更确切地说，当CMC在实际大气条件下（常压、存在相对湿度和恒定操作温度）运行时，很可能会发生从热导率到燃烧速率的转变。在相同的操作条件下，分析了不同气体流量和不同气体浓度下对CH₄的响应。通过吸附-脱附等温线、H₂-程序升温还原（H₂-TPR）、X射线衍射（XRD）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）和拉曼光谱对材料进行了全面表征。因此，将CeO:MnO用作CH₄检测的中温CMC的应用方面凸显出来。

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