Citrate complexation microwave-assisted synthesis of Ce sub(0.8)Zr sub(0.2)O sub(2) nanocatalyst over Al sub(2)O sub(3) used in CO oxidation for hydrogen purification: influence of composite loading and synthesis method

In this research, nanostructured Ce sub(0.8)Zr sub(0.2)O sub(2)/Al sub(2)O sub(3) composite catalysts were synthesized by a modified citrate complexation method with different loadings of active phase and support. The modification was carried out by impregnation and microwave-combustion techniques. XRD, FESEM, EDX, BET, FTIR and TPR-H sub(2) have been used for characterization of nanocatalysts. Utilizing a microwave-assisted combustion method, we created a sample with a more uniform and homogenous pattern, leading to better catalytic properties and more available lattice oxygen toward CO oxidation. According to the reactor test, it was found that the support has a strong influence on the activity of the catalysts. Generally, between citrate modified by impregnation, addition of alumina up to 40 wt% enhanced the dispersion of the active phase and greatly improved the catalytic activity of the catalyst. The composition that performed the best in the reactor test was Ce sub(0.8)Zr sub(0.2)O sub(2) (40 wt%)/Al sub(2)O sub(3), which was synthesized by a citrate complexation microwave-assisted combustion method.