Hysteresis phenomenon in CO and hydrogen oxidation on Cu–Ce–Zr–O systems

Hysteresis phenomenon in CO and hydrogen mixture oxidation on the CuO/Ce_0.7Zr_0.3O₂ systems is mainly caused by changing their states because of reduction and destruction of a Cu–Ce–Zr–O solid solution obtained during the preparation of catalysts by the decomposition of starting metal nitrates.