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首页> 外文期刊>Thin Solid Films >Preparation, characterization and deposition of Langmuir-Blodgett Co, Al organic films for the catalytic applications
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Preparation, characterization and deposition of Langmuir-Blodgett Co, Al organic films for the catalytic applications

机译：用于催化应用的Langmuir-Blodgett Co，Al有机膜的制备，表征和沉积

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VOC combustion is a demanding process for both reactor and catalyst design. As we have proved in recent papers the diffusional limitation of reaction rate that occur during combustion may be overcome by designing the metallic microstructures used as reactor internals. Their application on industrial scale depends on the development of an efficient method of catalyst layering on metallic supports and optimisation of a fine catalyst structure which would not change the elaborated microstructure geometry. In this study we propose the Langmuir-Blodgett (LB) film method to deposit various metals (Al, Co) in form of catalyst organic precursors. The film forming abilities of the precursors were checked by surface pressure measurements upon film compression, Brewster Angle Microscopy and by monolayers stability measurements. The amount of deposited materials was controlled by the LB parameters and verified by TG measurements. The catalyst obtained in this way were characterized at various stages of the preparation by SEM/XFS, XPS, AFM and RM methods and tested in n-hexane combustion. Oxidation of the Al washcoat precursor led to the formation of γ-Al_2O_3 improving the properties of the Al_2O_3 layer (α phase) developed on the precalcined CrAl carrier. Oxidation of cobalt stearate deposited on the CrAl gave dispersed Co_3O_4 spinel. The cobalt catalysts were active in combustion showing resistance to sintering, Compared to standard Pt supported catalyst they had twice as low activation energy (50 kJ/mol).
机译：VOC燃烧对于反应器和催化剂设计都是要求很高的过程。正如我们在最近的论文中所证明的那样，可以通过设计用作反应堆内部构件的金属微结构来克服在燃烧过程中发生的反应速率的扩散限制。它们在工业规模上的应用取决于开发一种在金属载体上进行催化剂分层的有效方法以及优化精细催化剂结构的方法，这种方法不会改变精细的微观结构的几何形状。在这项研究中，我们提出了Langmuir-Blodgett（LB）薄膜方法，以催化剂有机前体的形式沉积各种金属（Al，Co）。通过在膜压缩时的表面压力测量，布鲁斯特角显微镜（Brewster Angle Microscopy）和通过单层稳定性测量来检查前体的膜形成能力。沉积材料的量由LB参数控制，并通过TG测量进行验证。通过SEM / XFS，XPS，AFM和RM方法在制备的各个阶段对以此方式获得的催化剂进行表征，并在正己烷燃烧中进行测试。铝修补基面涂层前体的氧化导致形成γ-Al_2O_3，从而改善了在预煅烧CrAl载体上形成的Al_2O_3层（α相）的性能。沉积在CrAl上的硬脂酸钴的氧化得到分散的Co_3O_4尖晶石。钴催化剂在燃烧中具有活性，显示出抗烧结性。与标准的Pt负载催化剂相比，它们的活化能低两倍（50 kJ / mol）。

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