Thermogravimetry applied to characterization of SBA-15 nanostructured material

Preparation, characterization and catalytic activity of mesoporous Ag2HPW12O40/SBA-15 and Ag2HPW12O40/TiO2 composites

“…An exothermic peak over 500 C corresponds to the collapse of the Keggin anion and structural transformation, producing a phosphorusetungsten bronze without mass loss [17,42]. Thermal analysis of SBA-15 provides information about processes which are in the following temperature ranges: i) from room temperature to about 100 C as desorption of physically adsorbed water, ii) from 100 to 450 C as the polymeric template decomposition and from iii) 450e600 C as residual template decomposition and water from silanol condensation [43]. Due to the very high specific area of both composites, AgWPA/SBA-15 and WPA/SBA-15, their DTA and TGA profiles are quite similar and mass losses are more expressed compared to the pure active phases.…”

SBA-15 silicas containing sucrose

“…First, thermodesorption of water takes place first from the mesopores, then from the micropores [22]. In the range from 150 to 600°C, decomposition of incorporated template (Pluronic P123) and partially carbonized sucrose takes place [23,24]. In the case of pure silica N0-100, the mass change corresponding to the removal of organics is around 9% indicating that it is hardly possible to remove P123 completely by the extraction procedure [25].…”

Thermogravimetry applied to characterization of fly ash-based MCM-41 mesoporous materials

“…As indicated by the conducted research [12][13][14][15][16][17], thermogravimetric analysis (TGA) provides a lot of valuable information both on the thermal behaviour of samples of mesoporous materials and on the course of their synthesis process itself. Thermal analysis is used [12][13][14][15][16][17] for the TG monitoring of the synthesis of MCM-41 mesoporous materials being obtained from silicon sources, such as regular silica-gel or colloidal fumed silica, which allows the evaluation of the effect of adjusting pH during the hydrothermal synthesis on the quality of the obtained material.…”

“…Thermal analysis is used [12][13][14][15][16][17] for the TG monitoring of the synthesis of MCM-41 mesoporous materials being obtained from silicon sources, such as regular silica-gel or colloidal fumed silica, which allows the evaluation of the effect of adjusting pH during the hydrothermal synthesis on the quality of the obtained material. The monitoring encompasses also the process of removing the surfactant from the MCM-41 materials, serving for the determination of the appropriate time and temperature of calcination to obtain a good-quality mesoporous material.…”

“…The monitoring encompasses also the process of removing the surfactant from the MCM-41 materials, serving for the determination of the appropriate time and temperature of calcination to obtain a good-quality mesoporous material. Thanks to the TG method, it is also possible to determine the kinetics of surfactant decomposition [15,16].…”