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Catalytic performance of texturally improved Al-Mg mixed oxides derived from emulsion-synthesized hydrotalcites

机译：衍生自乳化合成水滑石术的典型改良Al-Mg混合氧化物的催化性能

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摘要

Mixed oxides of aluminum and magnesium derived from hydrotalcites were prepared by means of a sol-gel method mediated by an emulsified sol as pore template. The emulsion consisted of ethanol as the continuous phase and n-dodecane droplets as the dispersed phase, which was stabilized by the presence of the surfactant Pluronic P123. The use of such an emulsion was essential for obtaining materials with a porous structure that were assessed by mercury intrusion porosimetry and nitrogen physisorption. Additional characterization by NH3 and CO2 temperature programmed desorption confirmed that despite the enhancement of their textural properties, the number of acid and base sites was reduced in comparison to a reference and conventionally prepared Al-Mg mixed oxide, as a consequence of the depletion of surface hydroxyls during condensation of the precursors around the nonpolar droplets of the emulsion. Catalytic conversion of 2-propanol under conditions of controlled mass and heat diffusion on the texturally improved Al-Mg mixed oxides evidenced the preparation of a more effective catalyst than the poorly porous reference.
机译：通过乳化溶胶作为孔模板介导的溶胶 - 凝胶方法制备铝和镁的混合氧化物。乳液由乙醇作为连续相和N-十二烷液滴作为分散相，通过表面活性剂Pluronic P123的存在稳定。这种乳液的使用对于获得具有通过汞侵入孔隙瘤和氮原料评估的多孔结构的材料是必不可少的。 NH3和CO 2温度的额外表征被编程解吸证实，尽管其造纹性能提高，但与参考和常规制备的Al-Mg混合的氧化物相比，酸和基因位点的数量减少，因此是表面的耗尽在乳液的非极性液滴周围的前体凝结期间的羟基。在受控质量和热扩散条件下催化转化2-丙醇对典型的Al-Mg混合氧化物的热扩散，证明了比多孔差的参考更有效的催化剂的制备。

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  • 来源
    《RSC Advances》 |2018年第11期|共8页
  • 作者

    Petrolini Davi D.; da Silva Neto Alano V.; Urquieta-Gonzalez Ernesto A.; Pulcinelli Sandra H.; Santilli Celso V.; Martins Leandro;

  • 作者单位

    Univ Estadual Paulista UNESP Inst Quim Rua Prof Francisco Degni 55 BR-14800900 Araraquara SP Brazil;

    Univ Fed Sao Carlos Ctr Pesquisas Mat Avancados &

    Energia Rodovia Washington Luis Km 235 BR-13565905 Sao Carlos SP Brazil;

    Univ Fed Sao Carlos Ctr Pesquisas Mat Avancados &

    Energia Rodovia Washington Luis Km 235 BR-13565905 Sao Carlos SP Brazil;

    Univ Estadual Paulista UNESP Inst Quim Rua Prof Francisco Degni 55 BR-14800900 Araraquara SP Brazil;

    Univ Estadual Paulista UNESP Inst Quim Rua Prof Francisco Degni 55 BR-14800900 Araraquara SP Brazil;

    Univ Estadual Paulista UNESP Inst Quim Rua Prof Francisco Degni 55 BR-14800900 Araraquara SP Brazil;

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  • 正文语种 eng
  • 中图分类 化学;
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