“…The same finding was also observed in Ni/CeO 2 /Al 2 O 3 catalyst, as reported by Jia’s research group . Meanwhile, other work has also shown that CeO 2 with more vacancy sites is more favorable for the adsorption of ammonia and lowers the energy barrier for the initial step of ammonia dissociation . In addition, the I D / I F2g value of Ni/CeO 2 only showed a slight decrease at 400 °C (from 0.58 to 0.49) (Figure d), which can be ascribed to the lower oxygen vacancy content on the surface of Ni/CeO 2 , providing fewer sites for NH 3 adsorption than that of CeO 2 /Ni.…”