Tunable Effect of the Calcination of the Silanol Groups of KIT-6 and SBA-15 Mesoporous Materials
Tunable Effect of the Calcination of the Silanol Groups of KIT-6 and SBA-15 Mesoporous Materials
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DOI：
10.3390/app10030970
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发表时间：
2020-02-01
影响因子：
2.7
通讯作者：
Pergher, Sibele B. C.
中科院分区：
文献类型：
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作者：
Basso, Adriano M.;Nicola, Bruna P.;Pergher, Sibele B. C.
焙烧过程是合成SBA-15和KIT-6的关键步骤。它用于完全去除有机模板和缩合硅烷醇基团，并且它允许根据所采用的条件来确定这些材料的质地和物理性质。此外，煅烧影响材料表面上可用的硅烷醇的数量。如果合成这些材料用于吸附或官能化，则硅烷醇的浓度是重要的。为了理解和优化SBA-15和KIT-6的硅烷醇基团，在本研究中，改变煅烧温度和时间参数。实验在300、400和500 ℃下进行300、400和500 min。结果表明，保持硅烷醇基团的理想温度为300 ℃，但为了优化结构性质，最好在400 ℃下对这些分子筛进行焙烧。煅烧10小时没有得到比煅烧5小时更好的结果，表明前者的持续时间对于使用来说是过度的。
The calcination process is a crucial step during SBA-15 and KIT-6 synthesis. It is used to completely remove the organic template and condense silanol groups, and it allows the determination of the textural and physical properties of these materials, depending on the adopted conditions. Moreover, calcination influences the number of silanols available on the surface of the material. The concentration of silanols is important if these materials were synthesized for use in adsorption or functionalization. To understand and optimize the silanol groups of SBA-15 and KIT-6, in this study, the temperature and time calcination parameters were varied. The experiments were performed at 300, 400, and 500 degrees C for 300, 400, and 500 min. The results show that the ideal temperature to preserve the silanol groups is 300 degrees C, but to optimize the textural properties, it is better to calcine these molecular sieves at 400 degrees C. A calcination for 10 h did not give better results than a calcination for 5 h, demonstrating that the former duration is excessive for use.