介孔材料
纳米囊
化学工程
材料科学
催化作用
介孔有机硅
介孔二氧化硅
比表面积
煅烧
模板方法模式
纳米颗粒
纳米技术
有机化学
化学
工程类
作者
Tommy Haynes,Ouijdane Bougnouch,Vincent Dubois,Sophie Hermans
标识
DOI:10.1016/j.micromeso.2020.110400
摘要
Mesoporous silica nanocapsules were prepared by a soft and hard dual templating approach. Carbon black and carbon nanofibers, used as sacrificial templates (hard template) have been coated by a mesoporous silica layer. Pluronics (P123/F127) and cetrimonium bromide were selected as surfactants (soft template) to produce mesoporous layers with different morphologies and pore sizes. The coated samples were then calcined at high temperature to remove the hard template and produce silica nanocapsules with mesopores in their walls. The so-obtained materials have been characterized by XPS, elemental analyses (ICP), TEM, N2 physisorption and XRD. The results have shown that the obtained materials exhibit a high specific surface area and a short diffusional pathway within the porous structure, which represents a significant advantage for catalysis applications. Finally, mesoporous acidic nanocapsules were prepared by sulfonic acid moieties grafting, and were tested as a catalyst in a biomass valorization reaction, the hydrolysis of cellobiose. The catalysts have shown high catalytic performances underlining the high potential of the present synthetic approach to produce versatile mesoporous materials.
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