Silva Francisco Emanuel da, Rigoti Eduardo, Mello Mariele Iara Soares de, Pergher Sibele B C
Laboratorio de Peneiras Moleculares, Instituto de Química, Universidade Federal do Rio Grande do Norte, Av. Senador Salgado Filho, 3000. Bairro Lagoa Nova, Natal 59072-970, RN, Brazil.
Materials (Basel). 2024 Jun 10;17(12):2827. doi: 10.3390/ma17122827.
Changing the morphology is an excellent option for altering the textural parameters of SBA-15 materials. This study provides a guide on how the properties of mesoporous structures behave according to their morphology and their contribution to thermal stability. The objective of this work was to synthesize different morphologies (spherical, hexagonal prisms, rice-like grains, rods, and fibers) of SBA-15 materials and evaluate the existing textural changes. The materials were synthesized by varying the temperature of the synthesis gel from 25 °C to 55 °C, with stirring at 300 or 500 rpm. The results of X-ray diffraction, Fourier transform infrared spectroscopy, N adsorption and desorption, and scanning electron microscopy were evaluated. Thermal stability tests were also conducted in an inert atmosphere. The materials were successfully synthesized, and it was observed that they all exhibited different characteristics, such as their ordering, interplanar distance, mesoporous parameter, specific surface area, micropore and mesopore volumes, external mesoporous area, and wall thickness. They also presented different thermal stabilities. The rice grain morphology had the highest specific surface area (908.8 cm/g) and the best thermal stability, while the rod morphology had the best pore diameter (7.7 nm) and microporous volume (0.078 cm/g).
改变形态是改变SBA - 15材料结构参数的一个极佳选择。本研究提供了一份关于介孔结构的性质如何根据其形态表现以及它们对热稳定性贡献的指南。这项工作的目的是合成不同形态（球形、六方棱柱形、米粒状、棒状和纤维状）的SBA - 15材料，并评估现有的结构变化。通过将合成凝胶的温度从25℃变化到55℃，并在300或500转/分钟的转速下搅拌来合成材料。对X射线衍射、傅里叶变换红外光谱、N吸附和解吸以及扫描电子显微镜的结果进行了评估。还在惰性气氛中进行了热稳定性测试。材料成功合成，并且观察到它们都表现出不同的特性，例如它们的有序性、晶面间距、介孔参数、比表面积、微孔和介孔体积、外部介孔面积以及壁厚。它们还呈现出不同的热稳定性。米粒形态具有最高的比表面积（908.8平方厘米/克）和最佳的热稳定性，而棒状形态具有最佳的孔径（7.7纳米）和微孔体积（0.078立方厘米/克）。
