Structuration of LaMnO3 perovskite catalysts on ceramic and metallic monoliths: Physico-chemical characterisation and catalytic activity in methane combustion
Structuration of LaMnO3 perovskite catalysts on ceramic and metallic monoliths: Physico-chemical characterisation and catalytic activity in methane combustion
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DOI：
10.1016/j.apcata.2008.01.016
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发表时间：
2008-04
影响因子：
5.5
通讯作者：
E. Arendt;A. Maione;A. Klisińska;O. Sánz;M. Montes;S. Suárez;J. Blanco;P. Ruiz
中科院分区：
文献类型：
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作者：
E. Arendt;A. Maione;A. Klisińska;O. Sánz;M. Montes;S. Suárez;J. Blanco;P. Ruiz
采用柠檬酸盐法制备了钙钛矿型LaMnO3，并采用浸渍法和轨道搅拌法将其沉积在陶瓷和金属块体上。这两种类型的结构化催化剂的特征在于比表面积测量（BET），扫描电子显微镜（SEM），X射线衍射（XRD）和X射线光电子能谱（XPS）。考察了单块性质和涂覆技术等因素对催化剂沉积量的影响。结构化催化剂和粉末催化剂的比较表明，前者具有更高的催化活性。在较低的温度下，结构化的LaMnO3在金属单块上的催化性能较好，而在较高的温度下，结构化的LaMnO3在陶瓷单块上的催化活性较高。在结构化催化剂的反应速率的扩散限制的影响进行了观察。
LaMnO3perovskite was prepared by the citrate method and deposited on ceramic and metallic monoliths according to a dip coating or an orbital stirring procedure. Both types of structured catalysts were characterised by specific surface area measurements (BET), scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The parameters influencing the amount of deposited catalyst, such as the nature of the monolith and the coating technique, were investigated. Comparisons between structured and powdered catalysts showed a higher catalytic activity of the former. A better behaviour of structured LaMnO3on metallic monoliths was observed at a lower temperature, and higher catalytic activities were observed for structured LaMnO3on ceramic monoliths at a higher temperature. The influence of a diffusion limitation of the reaction rate in structured catalysts was observed.