Synthesis of an Innovative Framework of Mesoporous Catalyst (Kangolite) by Simple Approach to Promote the Catalytic Activity for CO₂ Decomposition

The level of carbon dioxide in the atmosphere is rapidly increasing, resulting in a rise in the atmospheric temperature. To mitigate the impact of global warming, we have implemented the method of catalytic carbon dioxide decomposition to liberate oxygen. In this view, AlSiO₄ and AlO₆FeSiO₄ are utilized, and these catalysts are prepared through the sol-gel technique at room temperature using iminodiacetic acid (IDA) as a template. The synthesized materials are characterized by FT-IR, XRD, BET, TGA and SEM. The above results prove the synthesized materials are crystalline, thermally stable (above 800 °C), mesoporous of AlSiO₄ (5 nm) and AlO₆FeSiO₄ (4 & 8 nm), and have a crystalline morphology. The crystal structures are drawn by XRD data. The crystal structure is revealed as the tetrahedral framework of AlSiO₄. However, the iron substitution produced a new framework of AlO₆FeSiO₄ instead of FeAlSiO₄. The AlO₆FeSiO₄ has octahedral aluminium, trigonal iron and tetrahedral silicate. The octahedral aluminium and trigonal iron are the active sites for CO₂ decomposition. AlO₆FeSiO₄ achieved a maximal conversion of 99% with an oxygen selectivity of 83% at 1 h, and AlSiO₄ has a conversion of 56% with an oxygen selectivity of 74% at 3 h. When the time is increased, the conversion and oxygen selectivity are decreased drastically on AlSiO₄, but it is maintained over AlO₆FeSiO₄. So, AlO₆FeSiO₄ is the best catalyst for global warming reduction when compared with AlSiO₄.