To further verify that the fine structure of prepared catalyst is consistent with the theoretical screening of catalyst, it was analyzed by X-ray absorption fine structure spectroscopy (XAFS) at the 1W1B beamline of Beijing Synchrotron Radiation Facility (Beijing, China) to confirm the coordination environment of Fe atoms in catalyst. Fe K-edge XAFS was acquired and the raw data were processed by using the Athena and Artemis modules in the IFEFFIT software packages. The amplitude reduction factor (S0 2 ) was fixed to 0.91. Fe K-edge theoretical XANES was simulated using the FDMNES code in the full multiple-scattering (FMS) mode. Energy-dependent Hedin-Lundqvist exchange-correlation potential was used in the calculation, and the cluster radius satisfied convergence requirement.