Sol‐Gel Synthesized SiO ₂ Supported Ni‐Al LDH Nanocomposite Based Mixed‐Metal Oxide Catalyst for the Conversion of High GWP Gas From N ₂ O to N ₂ and O ₂

Abstract Layered Double Hydroxides (LDH) are the 2D nanomaterials having the general formula [M 1‐x 2+ M x 3+ (OH) 2 ] x+ [A x/n ] n− .mH 2 O. They become one of the most promising catalysts for various applications because of their many unique properties, which include high surface area, uniform atomic level distribution, and acid‐base bifunctionality. In this work metal acetylacetonate was used as a precursor to synthesize Ni‐Al and its SiO 2 ‐supported product by the nonaqueous sol‐gel method. PXRD, FT‐IR, TGA, BET surface area and pore volume analysis, Zeta potential, particle size analysis, SEM, TEM, and EDS analysis were used to characterize them. The mixed‐metal oxides were obtained by calcinations of the synthesized LDHs at 450 °C. The resulting mixed metal oxide was subsequently employed as a catalyst for the N 2 O decomposition process. When the SiO 2 : LDH ratio varied, these catalysts showed improved N 2 O decomposition at 450 °C with the changes of SiO 2 : LDH ratio. In the presence of SiO 2 : LDH ratios of (2:1) and (1:2), around 99.5% of N 2 O conversion was noted.