以Na2SnO3和SnCl4·5H2O为前驱体水热合成Sn-magadiite的比较,Applied Clay Science

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以Na2SnO3和SnCl4·5H2O为前驱体水热合成Sn-magadiite的比较
Applied Clay Science ( IF 5.3 ) Pub Date : 2019-12-01 , DOI: 10.1016/j.clay.2019.105293
Tiago G. Santos , Antonio O.S. Silva , Simoni M.P. Meneghetti

摘要 Magadiites 是一类重要的层状硅酸盐，其负电荷可由位于层间空间的 Na+ 或 H+ 补偿，从而形成球团。在层间间距或硅酸盐层中引入阳离子，例如铝，在调节材料性能方面起着重要作用。在这项工作中，使用两种不同的 Sn 源（Na2SnO3 或 SnCl4·5H2O），通过在 magadiite 结构中 Si 被 Sn 同晶取代，水热合成硅酸锡，以研究前驱体的性质对最终产品特性的影响。材料，这可以承诺在催化。以各种 Sn/Si 摩尔比合成的样品通过多种技术进行表征，无论使用何种 Sn 源，结果证实了在 Sn-magadiite 薄片上存在四面体 SnO4 物质，从而产生具有弱到中等酸性的高度结晶材料。重要的是要强调通常使用 SnCl4·5H2O 作为锡源，据我们所知，本研究首次使用前体 Na2SnO3 作为一种有前景且廉价的锡源来合成此类硅酸锡，领先由于在薄片上形成花椰菜结构，因此具有高结晶度但形态差异很小的材料。

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Comparison of the hydrothermal syntheses of Sn-magadiite using Na2SnO3 and SnCl4·5H2O as the precursors

Abstract Magadiites constitute an important class of lamellar silicates, in which the negative charges can be compensated by either Na+ or H+ located in the interlayer spaces, resulting in a cluster of spheres. The introduction of cations, for example Al, in the interllamelar spacing or in silicate layers plays an important role in modulating the material properties. In this work, stannosilicates were hydrothermally synthesized via the isomorphic substitution of Si by Sn in the structure of magadiite using two different sources of Sn (Na2SnO3 or SnCl4·5H2O) to investigate the influence of the nature of the precursor on the characteristics of the final material, which can be promised in the catalysis are. Samples synthesized with various Sn/Si molar ratios were characterized by several techniques, and regardless of the Sn source used, the results confirm the presence of tetrahedral SnO4 species on Sn-magadiite lamellae, giving highly crystalline materials that exhibit weak to moderate acidity. It is important to highlight that usually SnCl4·5H2O is used as a source of tin, and to our knowledge, this study is the first to use the precursor Na2SnO3 as a promising and cheap Sn source for the synthesis of this type of stannosilicate, leading to materials with high crystallinity but slight morphological differences due to the formation of cauliflower structures on the lamellae.

更新日期：2019-12-01

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