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Porous materials prepared by ultrasonic spray pyrolysis.

机译：通过超声喷雾热解制备的多孔材料。

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摘要

Powders produced by ultrasonic spray pyrolysis (USP) are typically comprised of submicron, dense particles; however, depending on a material's applications, porous particles are more desirable. Here, porous particles are prepared using two newly developed templated aerosol methods. In the first approach, a sacrificial template is added to the precursor solution, allowing for composite formation via USP. Post-collection chemical treatment removes the template and introduces pores into the product particles. In the second approach, a temporary salt template is generated in situ which is then removed via aqueous workup.;The first approach was used to prepare porous MoS2 powders. These powders were extensively characterized by scanning and transmission electron microscopy (SEM and TEM), powder X-ray diffraction (XRD), BET analysis of N2 isotherms, O2 chemisorption, and other analytical techniques. A Co-promoted MoS2 porous powder also was prepared. Both the unpromoted and Co-promoted samples were found to be highly active thiophene hydrodesulfurization catalysts.;The second approach was used to prepare meso- and macroporous carbons. A variety of carbon morphologies were observed (as indicated by SEM and TEM). Analysis of the carbon precursors using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) suggests that the decomposition behavior of each precursor is responsible for the observed morphology differences. These carbon materials often have high surface areas and are thermally stable, making them potentially useful in electrochemical, catalytic, adsorbent, and gas-storage applications.
机译：通过超声喷雾热解（USP）生产的粉末通常由亚微米，致密的颗粒组成。然而，取决于材料的应用，更期望多孔颗粒。在此，使用两种新开发的模板化气雾法制备多孔颗粒。在第一种方法中，将牺牲模板添加到前体溶液中，以允许通过USP形成复合材料。收集后的化学处理会除去模板，并在产品颗粒中引入孔。在第二种方法中，原位生成一个临时的盐模板，然后通过水性处理将其除去。;第一种方法用于制备多孔MoS2粉末。这些粉末通过扫描和透射电子显微镜（SEM和TEM），粉末X射线衍射（XRD），N2等温线的BET分析，O2化学吸附和其他分析技术进行了广泛表征。还制备了共促进的MoS 2多孔粉末。发现未促进和共同促进的样品均为高活性噻吩加氢脱硫催化剂。第二种方法用于制备中孔和大孔碳。观察到多种碳形态（如SEM和TEM所示）。使用差示扫描量热法（DSC）和热重分析（TGA）分析碳前体表明，每种前体的分解行为是所观察到的形态差异的原因。这些碳材料通常具有较高的表面积并且是热稳定的，从而使其潜在地可用于电化学，催化，吸附剂和气体存储应用。

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  • 作者

    Skrabalak, Sara.;

  • 作者单位

    University of Illinois at Urbana-Champaign.;

  • 授予单位 University of Illinois at Urbana-Champaign.;
  • 学科 Chemistry Inorganic.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 245 p.
  • 总页数 245
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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