Mixed metal oxidic nano sheets coated monolithic catalysts useful for the decomposition of toxic N₂O and a process for the preparation thereof

摘要

A process for the preparation of nano-oxide coated catalysts useful for the treatment of toxic gases by coating of composite materials containing LDHs over ceramic monolithic substrates. The process combines reacting oxides and salts of metals so as to prepare LDHs or mixed metal layered hydroxides possessing positive layer charge, from which a stable gel is prepared by adding swellable clay having a negative charge in different LDH:clay ratio in an aqueous medium and homogenizing the same in a high intensity ultrasonic processor. The gel is then dip-coated over cordierite/mulite honey-comb monolithic supports at various dipping and withdrawal rates. The dip-coated monoliths are then dried and calcined at different temperatures to develop the alumino-silicate supported nano-oxide coats over honey-comb ceramic substrates for carrying out decomposition of N20 gas in a He flow in various flow rates at 400 to 600° C. temperature in a cylindrical quartz tube.