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首页> 外文期刊>Catalysis science & technology >Interfacial interaction driven CO oxidation: nanostructured Ce_(1-x)La_xO_(2-δ)/TiO2 solid solutions
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Interfacial interaction driven CO oxidation: nanostructured Ce_(1-x)La_xO_(2-δ)/TiO2 solid solutions

机译：界面相互作用驱动的CO氧化：纳米结构的CE_（1-X）LA_XO_（2-δ）/TIO2固体溶液

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摘要

Titania supported ceria-lanthana solid solutions (Ce_(1-x)La_xO_(2-δ)/TiO2; CLT) have been synthesized by a facile and economical route. Existence of synergism between ceria-lanthana (CL) solid solutions and titania-anatase phase, which leads to decrease in the crystallite size, retarded titania phase transformation, and improved redox properties, has been thoroughly investigated by various techniques, namely. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), UV-visible diffuse reflectance spectroscopy (UV-vis DRS), Raman spectroscopy (UV-RS and Vis-RS), BET surface area analysis, and temperature programmed reduction (TPR). Two key observations made from the whole exercise were (i) mutual interaction of Ce and Ti ions could impose typical Ce-O-Ti modes at the interfacial region and (ii) the La~(3+) ion as a dopant provokes a large number of oxygen vacancies via a charge compensation mechanism. The promising role of these factors in the CO oxidation (one of the most formidable challenges) has been comprehensively described. The observed enhanced activity for the CLT sample is primarily attributed to an apparent specific orientation of the active component over the support, which is endorsed by the interfacial interaction. This specific mode could facilitate the CO adsorption with simultaneous bulk oxygen diffusion for more consumption and in turn better activity.
机译：二氧化钛支持的谷物兰顿固体溶液（CE_（1-X）LA_XO_（2-δ）/TIO2; CLT）已通过便利和经济的途径合成。各种技术都对各种技术进行了彻底的研究，从而彻底研究了陶瓷溶液（CL）固体溶液与二氧化钛酶相之间的协同作用，从而导致结晶石尺寸减少，延迟的二氧化钛相变和改进的氧化还原性能，从而彻底研究了各种技术。 X射线衍射（XRD），X射线光电子光谱（XPS），透射电子显微镜（TEM），UV-可见的弥漫性反射光谱（UV-VIS DRS），拉曼光谱（UV-RS和VIS-RS），uv-rs和vis-rs和bet表面积分析和温度编程还原（TPR）。整个练习做出的两个关键观察结果是（i）CE和TI离子的相互作用可能在界面区域施加典型的CE-O-TI模式，并且（ii）la〜（3+）离子作为掺杂剂会引起大型的毒品通过电荷补偿机制的氧空位数量。这些因素在CO氧化（最艰巨的挑战之一）中的有希望的作用已得到全面描述。观察到的CLT样品的增强活性主要归因于活性成分在支撑上的明显特异性方向，这是由界面相互作用认可的。这种特定模式可以促进与同时散装氧扩散的同时吸附，从而获得更多的消耗和更好的活性。

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