Study on the performance of NiO/Zn Zr catalysts for CO hydrogenation.

The NiO/Zn Zr ( represents the molar mass of Zn) catalyst was prepared by the impregnation method and tested in CO methanation. The activity results show that NiO/ZnZr has a higher CO conversion rate and methane selectivity than NiO/ZnO and NiO/ZnO-ZrO. Combined with N adsorption-desorption, H-TPR, CO-TPD, H-TPD, XRD, TEM, XPS and FTIR and other characterization methods, the physical and chemical properties of NiO/ZnO-ZrO were studied. The incorporation of ZnO into NiO/ZrO forms a ZnO-ZrO solid solution, and the combination of the solid solution weakens the interaction between NiO and the oxide support, thereby promoting the reduction and dispersion of NiO. The H-TPR experiment results show that, because ZnO-ZrO forms a solid solution, NiO is better dispersed on the surface, resulting in a significant reduction in the reduction temperature of NiO. Using FTIR to conduct CO adsorption and methanation experiments on NiO/Zn Zr to determine the adsorbed species and intermediates, the results show that CO methanation follows the formate pathway.