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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Influence of the Support Surface Chemistry on the Catalytic Performances of PdO/BN Catalysts
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Influence of the Support Surface Chemistry on the Catalytic Performances of PdO/BN Catalysts

机译：载体表面化学性质对PdO / BN催化剂催化性能的影响

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摘要

Two high surface areas BN powders have been prepared to be used as supports for palladium catalysts in propylene oxidation. Two different precursors originating from borazines were used for BN preparation. The BN prepared from trichloroborazine (TCB) had a surface area of 184 m~2 g~(-1) and micrometric spherical (ball-shaped) texture. When polytrimethylaminoborazine was used as a precursor, the support obtained (BN_(1-x)O_x) presented an oxi-nitride structure with a surface area of 115 m~2 g~(-1) and a glassy aspect. Palladium oxide catalysts were prepared by impregnation of these two supports. Characterization techniques, such as BET, XRD, TEM, XPS, TG, and electrical properties measurements, have been used to study the influence of the surface chemistry of the support on the catalytic performances of the prepared catalysts. The acidic and redox properties of the resulting samples were characterized by TPR and adsorption microcalorimetry. The presence of oxygen in the structure of BN_(1-x)O_x support induced different behaviors when compared with pure BN and played an important role in the catalytic activity of PdO/BN_(1-x)O_x sample.
机译：已经制备了两种高表面积的BN粉末，用作丙烯氧化中钯催化剂的载体。源自硼嗪的两种不同的前体用于制备BN。由三氯硼嗪（TCB）制备的BN的表面积为184 m〜2 g〜（-1），具有微米级球形（球形）织构。当使用聚三甲基氨基硼嗪作为前体时，所获得的载体（BN_（1-x）O_x）呈现出表面积为115m〜2g〜（-1）和玻璃态的氧氮化物结构。通过浸渍这两种载体来制备氧化钯催化剂。表征技术（例如BET，XRD，TEM，XPS，TG和电性能测量）已用于研究载体表面化学性质对制备的催化剂的催化性能的影响。通过TPR和吸附量热法对所得样品的酸性和氧化还原特性进行了表征。与纯BN相比，BN_（1-x）O_x载体结构中氧的存在引起不同的行为，并且在PdO / BN_（1-x）O_x样品的催化活性中起重要作用。

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