Co-Ni supported yttrium oxide material as a catalyst for ammonia decomposition to COx-free hydrogen

The preparation of CO2-free hydrogen by decomposing ammonia using non-precious metal catalysts has received widespread attention. Co-based catalysts have good catalytic activity and low synthesis costs. Therefore, we prepared a series of Y2O3-loaded Co and Co -Ni bimetallic catalysts by the co-precipitation method. The structure-activity relationship of the catalysts during NH3 decomposition was investigated by X-ray diffraction, N2 adsorption-desorption, transmission electron microscopy, and Temperature-programmed reduction by hydrogen. The ammonia decomposition performance of the bimetallic Co-Ni was examined to elucidate the effect of the relative amount of the active metal of the catalyst on the catalytic activity and compared it with the monometallic Co/Y2O3. Among the tested catalysts, 20Co-10Ni/Y2O3 showed the best catalytic performance as well as good stability. The ammonia decomposition rate of the 20Co-10Ni/Y2O3 catalyst was 85.02% at 550 degrees C and GHSV of 9000 mL h 1 center dot gcat 1, which was 28.5% higher than that of the