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首页> 外文会议>2003 Nanotechnology Conference and Trade Show Nanotech 2003 Vol.3 Feb 23-27, 2003 California, USA >Preparation and Microstructural Characterization of Pt-Pd Bimetallic Catalysts Supported on TiO_2
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Preparation and Microstructural Characterization of Pt-Pd Bimetallic Catalysts Supported on TiO_2

机译：TiO_2负载Pt-Pd双金属催化剂的制备及其微观结构表征。

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Nanoparticles, specially metallic nanoparticles finely dispersed onto high surface area supports, play an important role in heterogeneous catalysis because the performance of a supported metal catalyst can be related to design, which is most crucial for the development of novel catalytic processes. It requires some understanding of the mechanism of the catalytic reaction, and knowledge of the crucial properties that determine the activity, selectivity and lifetime of the catalyst. Studies of the interrelationship between structural and chemical properties of solid materials and their catalytic properties. These studies are frequently carried out using specially prepared model catalysts, which are amenable to analysis with modern surface analytical methods providing structural and chemical information on molecular scale, as TEM attach with X-EDS. Various techniques and concepts of solid state and surface chemistry are applied for modifying and synthesizing catalyst materials with the required structural and chemical properties. In this work, we prepared Pt-Pd bi metallic catalysts by impregnation with chloroplatinic acid and palladium chloride supported on TiO_2. The structural and physic characterization of these samples were carried out by BET Surface Area, X-Rays Diffraction (X-RD), Transmission Electron Microscopy (TEM), attach with X-Ray and Energy Dispersive Spectroscopy (XEDS). Our interest in Pt-Pd catalysts in skeletal reactions of hydrocarbons has been initiated by both practical and theoretical reasons. Both catalysts, in supported or unsupported forms, are active in skeletal isomerization, C5-cyclization, aromatization, and, to a lesser extent, hydrogenolysis. Of the two metal blacks, Pd was more selective toward C6 product formation from various hexane isomers than Pt[6]. It is well known that supported metal catalyst can exhibit drastically different performances depending on conditions of preparation and treatment. Catalytic properties of Pt-Pd/TiO_2 for Metilciclopentene conversion (skeletal isomerization and hydrogen transfer) have been studied. It has been shown that catalytic activity are increased on samples, but at the same time products of the hydrogen transfer reaction seem to be increased too, lowering the selectivity of the reaction: isomerization always predominates.
机译：纳米颗粒，特别是精细地分散在高表面积载体上的金属纳米颗粒，在非均相催化中起着重要作用，因为负载的金属催化剂的性能可能与设计有关，这对开发新型催化方法至关重要。它需要对催化反应的机理有一定的了解，并需要了解决定催化剂活性，选择性和寿命的关键性能。研究固体材料的结构和化学性质与其催化性质之间的相互关系。这些研究通常使用专门制备的模型催化剂进行，这些催化剂适合用现代表面分析方法进行分析，因为TEM与X-EDS相连，因此可以提供分子级的结构和化学信息。固态和表面化学的各种技术和概念被用于改性和合成具有所需结构和化学性质的催化剂材料。在这项工作中，我们通过用负载在TiO_2上的氯铂酸和氯化钯浸渍制备了Pt-Pd双金属催化剂。这些样品的结构和物理特征通过BET表面积，X射线衍射（X-RD），透射电子显微镜（TEM），X射线和能量色散光谱（XEDS）进行。我们对烃骨架反应中的Pt-Pd催化剂的兴趣是由实践和理论原因引起的。负载或未负载形式的两种催化剂在骨架异构化，C5-环化，芳构化以及较小程度上的氢解中均具有活性。在两种金属黑中，Pd对各种己烷异构体形成C6产物的选择性要比Pt [6]高。众所周知，取决于制备和处理条件，负载型金属催化剂可表现出截然不同的性能。研究了Pt-Pd / TiO_2对茂金属环戊烯转化的催化性能（骨架异构化和氢转移）。已经表明，样品上的催化活性增加，但同时氢转移反应的产物似乎也增加，降低了反应的选择性：异构化总是占主导地位。

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