Catalytic properties of cesium salts of 12-molybdophosphoric acid supported on SBA-15 mesoporous silica

The Cs salt of molybdophosphoric acid CS2.5H0.5PM012O40 (CsHPM) was supported on SBA15 in the concentration of 20, 30 and 40 wt. % loadings. The structure and texture of these CsHPM/SBA-15 composites were studied by XRD, FT-IR and micro-Raman spectroscopy, BET and pore size distribution, SEM-EDS. Thermal stability was investigated by thermo gravimetric analysis (TGA), differential thermal analysis (DTA) and differential scanning calorimetry (DSC). The dehydration of ethanol was used to probe the catalytic properties of the CsHPM samples incorporated on the silica matrix. The main reaction products obtained on acid (dehydration) catalytic centres were ethylene and diethyl ether, and respectively acetaldehyde which was obtained on redox (dehydrogenation) catalytic centres

Temperature effect on CO2 adsorption-desorption process of different functionalized mesoporous materials

In this paper was studied the adsorption-desorption of CO2 and the effect of temperature on amino-functionalized mesoporous materials by using temperature programmed desorption – TPD method. The adsorption of CO2 and its TPD method was investigated using thermogravimetric analysis coupled with a Pfeiffer-Vacuum-Thermo Star mass spectrometer. For this purpose MCM-41, SBA-15 and SSBA-15 functionalized mesoporous materials were prepared and investigated at different adsorption-desorption temperatures: 50, 60, 70 and 80°C. These composites were also characterized from the structural point of view: FT-IR spectroscopy and nitrogen physisorption at 77K

Amine functionalized KIT-6 for CO2 adsorption at different temperatures

In this paper, pure KIT-6 was synthesized and functionalized with 3-aminopropyl triethoxysilane (APTES) by grafting in aqueous solvent at 80°C. The as-prepared composites were characterized by X-ray diffraction at low angles, FT-IR spectroscopy, TGA-DTA coupled with mass-spectrometry, SEM and N2 physisorption techniques followed by testing for CO2 adsorption at different temperatures. The CO2 adsorption/desorption performance was investigated by TGA-DTA coupled with mass-spectrometry using TPD method. The results showed that the CO2 adsorption capacity decreases with increasing temperature from 40 to 70 °C