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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Lamellar zirconium phosphates to host metals for catalytic purposes
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Lamellar zirconium phosphates to host metals for catalytic purposes

机译：层状磷酸锆至宿主用于催化目的的金属

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In the present study a porous lamellar zirconium phosphate heterostructure (PPH) formed from zirconium(IV) phosphate expanded with silica galleries (P/Zr molar ratio equal to 2 and (Si + Zr)/P equal to 3) was prepared to host noble metals. Textural and structural characterization of PPH-noble metal materials was carried out in order to elucidate the location and dispersion of the metallic particles and the properties of the resulting material to be used in catalytic processes. In the present paper, their activity in the catalytic hydrodeoxygenation (HDO) reaction of dibenzofuran (DBF) was evaluated. X-ray diffraction (XRD), solid state nuclear magnetic resonance (NMR) and X-ray photoelectron spectroscopy (XPS) evidenced that the structure of the pillared zirconium phosphate material was not modified by the incorporation of Pt and Pd. Moreover, transmission electron microscopy (TEM) showed a different dispersion of the noble metal. The acidity of the resulting PPH-noble metal materials also changed, although in all cases the acidity was of weak nature, and the incorporation of noble metals affected Bronsted acid sites as observed from P-31 NMR spectra. In general, the textural, structural and acidic properties of the resulting materials suggest that PPH can be considered a good candidate to be used as a catalytic support. Thus, the catalytic results of the PPH-noble metal samples indicated that the Pd sample showed a stable behavior probably ascribed to a high dispersion of the active phase. However, the Pt sample suffered from fast deactivation. The selectivity to the reaction products was strongly dependent on the noble metal employed.
机译：在从锆（IV）形成的本研究的多孔层状磷酸锆异质结构（PPH）磷酸盐与二氧化硅画廊膨胀（P / Zr的摩尔比等于2且（SI +的Zr）/ P等于3）制备，以主机贵金属金属。进行PPH-贵金属材料的纹理和结构表征，以阐明金属颗粒的位置和分散和所得材料的性质以用于催化方法。在本文中，评估其在二苯并呋喃（DBF）的催化加法氧基（HDO）反应中的活性。 X射线衍射（XRD），固态核磁共振（NMR）和X射线光电子能谱（XPS）证明了通过掺入Pt和Pd的掺入柱磷酸锆材料的结构。此外，透射电子显微镜（TEM）显示出贵金属的不同分散体。所得的PPH-贵金属材料的酸度也改变，尽管在所有情况下，酸度是弱的性质，并且掺入从P-31 NMR光谱观察到的贵金属受影响的伪脂酸部位。通常，所得材料的纹理，结构和酸性特性表明，PPH可以被认为是用作催化载体的良好候选者。因此，PPH-贵金属样品的催化结果表明PD样品显示出稳定的行为可能归因于活性相的高分散体。然而，PT样品遭受快速停用。对反应产物的选择性强烈依赖于所用的贵金属。

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