fig2

Figure 2. XRD patterns of xNi-LCCM catalysts with different Ni loadings: (A) catalysts calcined at 1,100 °C for 5 h in air; (B) enlarged view of the 2θ range of 32°-35° for the calcined catalysts; (C) catalysts reduced at 750 °C for 2 h in H₂/N₂; and (D) enlarged view of the 2θ range of 32°-35° for the reduced catalysts. Diffraction peaks corresponding to LCCM, NiO, and metallic Ni are indicated. XRD: X-ray diffraction; LCCM: (La_0.75Ca_0.25)(Cr_0.5Mn_0.5)O_3-δ.