The date of Mo1Sn20

Weigh 100 mg of catalyst and place it in a sample tube. Heat it up to 400 ° C in an inert atmosphere with a gas flow rate of 30 mL/min, then cool it down to 50 ° C. Introduce NH3 (30 mL/min) for adsorption for 10 minutes, then blow it out. Finally, heat it up to 600 ° C for desorption and record the signal. The programmed temperature reduction (H2-TPR) test was conducted on the TP 5080 chemical adsorption instrument.

Weigh 100 mg of catalyst and place it in a sample tube, program the temperature to 200 ° C, and then cool it down to 50 ° C. Then, the mixed gas is introduced and the temperature is programmed to 900 ° C to reduce the catalyst, and the signal is recorded. The N2 physical adsorption and desorption test was conducted on a Japanese Bayer (BEL) BELSORP-MAX II instrument, and the catalyst sample was subjected to degassing pretreatment at 200 ° C. Then, a low-temperature N2 adsorption and desorption experiment was conducted using pure liquid nitrogen as the adsorption medium (-196 ° C). Raman testing was conducted on a Horiba evolution Raman spectrometer, with an excitation wavelength of 532 nm and a scanning range of 100-1100 cm-1. Fourier transform infrared spectroscopy (FT-IR) was performed on Bruker Tensor 27, using KBr to scan the background.

Place the catalyst into the sample cell, with Ar as the carrier gas, raise the temperature to 200 ° C, maintain the temperature for 1 hour, and then lower it to the test temperature for testing. X-ray photoelectron spectroscopy (XPS) characterization was performed on Thermo Fisher's ESCALAB 250xi X-ray photoelectron spectroscopy, with a particle source of A1 K α (hv=1486.6 eV), use the binding energy of C1s (284.6 eV) to compare and correct with the measured element.