Scholarlink

<p>High surface area mesoporous γ-Al<sub>2</sub>O<sub>3</sub> was synthesized using a robust template-free glycothermal process. The samples were prepared using inexpensive aluminium nitrate and two different precipitating agents (aqueous ammonia and urea), forming nanorods and nanosheets, respectively. The resultant material was calcined at 600&#xa0;°C for 3 and 5&#xa0;h to ensure the formation of the γ-Al<sub>2</sub>O<sub>3</sub> with penta-coordinated Al<sup>3+</sup>. The surface and morphology of the synthesized material were characterized using <sup>27</sup>Al MAS NMR, N<sub>2</sub>-physisorption, NH<sub>3</sub>-TPD, TEM, SEM, and powder-XRD. <sup>27</sup>Al MAS NMR confirmed the presence of varying amounts of penta-coordinate Al<sup>3+</sup> on the surface. The surface area of the synthesized material varied from 239 m<sup>2</sup> g<sup>−1</sup> to 492 m<sup>2</sup> g<sup>−1</sup>, depending on thermal treatment. The TEM and SEM observations highlighted the different microstructures and morphology present for the synthesized materials, with distinct 3D surfaces present for the nanorod and nanosheet samples. The described methods provide a robust, scalable synthesis for penta-coordinate Al<sup>3+</sup> γ-Al<sub>2</sub>O<sub>3,</sub> which can be used in industrial applications such as catalysis, energy storage, and nanocomposites.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Developing new strategies for template-free synthesis of penta-coordinated Al3+ γ-Al2O3 with different morphologies using glycothermal modification

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年3月6日

查看全文
  • Aaron L. Folkard,
  • Victor O. Anyanwu,
  • Holger B. Friedrich

摘要

High surface area mesoporous γ-Al2O3 was synthesized using a robust template-free glycothermal process. The samples were prepared using inexpensive aluminium nitrate and two different precipitating agents (aqueous ammonia and urea), forming nanorods and nanosheets, respectively. The resultant material was calcined at 600 °C for 3 and 5 h to ensure the formation of the γ-Al2O3 with penta-coordinated Al3+. The surface and morphology of the synthesized material were characterized using 27Al MAS NMR, N2-physisorption, NH3-TPD, TEM, SEM, and powder-XRD. 27Al MAS NMR confirmed the presence of varying amounts of penta-coordinate Al3+ on the surface. The surface area of the synthesized material varied from 239 m2 g−1 to 492 m2 g−1, depending on thermal treatment. The TEM and SEM observations highlighted the different microstructures and morphology present for the synthesized materials, with distinct 3D surfaces present for the nanorod and nanosheet samples. The described methods provide a robust, scalable synthesis for penta-coordinate Al3+ γ-Al2O3, which can be used in industrial applications such as catalysis, energy storage, and nanocomposites.