Study on Deactivation Mechanism of Iron-based Catalyst for Hydrogenation of CO2 to Olefins Data Source Document

Inductively coupled plasma optical emission spectroscopy (ICP-OES, Shimadzu, Japan) was used to analyze the elemental content of the sample. The phase composition of the sample was characterized using a Bruker D8/Adavance X-ray diffractometer from Germany; The X-ray source is Cu K α, with a scanning rate of 12 °/min, a scanning range of 10 °~80 °, a voltage of 40 kV, and a current of 40 mA. Based on XRD spectra, the catalyst phase was semi quantitatively analyzed using the Reference Intensity Ratio (RIR) method based on the characteristic diffraction peak with an intensity of 100% in the powder diffraction standard card. Raman testing was conducted using the LabRAM HR Evolution Raman spectrometer from HORIBA Corporation in Japan. Using a 532 nm laser generated by He Cd as the light source, with a scanning range of 2000~100 cm-1. The O2-TPO test was conducted using a Catlab catalytic microreactor from Hiden UK, and the emitted gas was detected by a QIC20 mass spectrometer from Hiden UK. Place 0.05 g of the sample in a sample tube, remove water with Ar as the carrier gas at 300 ℃ for 30 minutes, and lower the temperature to 50 ℃. Then, in an O2-Ar (O2: Ar=5:95) mixed gas atmosphere, blow the baseline until it stabilizes, and finally raise the temperature to 600 ℃ at a rate of 5 ℃/min. Obtain the O2-TPO spectrum by recording the CO2 signal during the heating process.