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Consecutive Surfactant-Templating Opens up New Possibilities for Hierarchical Zeolites

机译:连续的表面活性剂 - 模板对等级沸石开辟了新的可能性

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摘要

Intracrystalline mesoporosity can be conveniently introduced in zeolites using cationic surfactants in a mild basic solution -a process known as surfactant-templating. However, this technique is limited to small-headed and single-chain surfactants because they need to diffuse through the narrow micropores of the zeolite, which limits the potential of this approach. Herein, we show that the mesoporosity generated in zeolites with small-headed and single-chain surfactants, such as CTAB, provides enough accessibility to allow the use of bulky surfactants that otherwise cannot enter the structure of the zeolite. Moreover, in this contribution, a USY zeolite has been successively treated with cationic surfactants of different chain lengths (C12 to C22) proving that the mesopores introduced in the zeolite can be efficiently widened and narrowed by consecutive treatments with surfactants of the suitable size. Finally, the use of consecutive surfactant-templating opens up the possibility of using surfactants of different packing parameters to produce new hierarchical architectures in zeolites.
机译:使用称为表面活性剂 - 模板的温和碱性溶液中的阳离子表面活性剂可以方便地在沸石中方便地在沸石中引入沸晶的中渗。然而,该技术仅限于小头和单链表面活性剂,因为它们需要通过沸石的窄微孔来扩散,这限制了这种方法的潜力。在此,我们表明,在具有小头和单链表面活性剂的沸石中产生的中孔差,例如CTAB,提供足够的可达性,以允许使用庞大的表面活性剂,否则否则不能进入沸石的结构。此外,在这种贡献中,通过不同链长的阳离子表面活性剂(C12至C22)依次依次处理磷酸盐沸石(C12至C22),证明在沸石中引入的中孔可以通过连续处理有效地加宽和变窄,具有合适尺寸的表面活性剂。最后,使用连续表面活性剂 - 模板的使用开辟了使用不同包装参数的表面活性剂在沸石中产生新的分层架构的可能性。

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  • 来源
    《Crystal growth & design》 |2020年第2期|共6页
  • 作者单位

    Univ Alicante Dept Quim Inorgan Lab Nanotecnol Mol Ctra San Vicente Alicante S-N E-03690 Alicante Spain;

    Univ Alicante Dept Quim Inorgan Lab Nanotecnol Mol Ctra San Vicente Alicante S-N E-03690 Alicante Spain;

    ALBA Light Source Barcelona 08290 Spain;

    Univ Alicante Dept Quim Inorgan Lab Nanotecnol Mol Ctra San Vicente Alicante S-N E-03690 Alicante Spain;

    Univ Alicante Dept Quim Inorgan Lab Nanotecnol Mol Ctra San Vicente Alicante S-N E-03690 Alicante Spain;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 晶体学;
  • 关键词

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