Synthesis of aluminum-copper catalysts based on product of centrifugal thermal activation of gibbsite and their activity in selective oxidation of ammonia

Using the methods of X-ray, thermal, microscopic, adsorption and chemical analyzes, the possibility of obtaining aluminum-copper mixed oxide catalysts by preliminary hydrothermal treatment of a suspension of the product of centrifugal thermal activation of gibbsite with an aqueous solution of copper nitrate and subsequent heat treatment of the obtained precursor was studied. The heat treated in the range of 450-750 degrees C catalysts are mainly mixtures of CuO and CuAl2O4 phases in different ratio. The different ratio of active phases allows them to be used as catalysts for low-temperature purification of NH3 and high-temperature combustion of NH3 as a fuel at various power plants. Testing of catalysts in the process of selective oxidation of ammonia (NH3-SCO) showed that prepared aluminum-copper catalysts are not inferior in their catalytic properties to known catalysts, including aluminum-platinum ones, and the proposed synthesis method is resource-saving compared to known methods, including those with many options for preparing these systems by "sol-gel" technology.