Study on the performance of NiO/Zn x Zr1- x catalysts for CO2 hydrogenation

Shuai Chang; Wenshuo Mao; Wei Na; Wengui Gao; Gaocheng Qu; Hua Wang

doi:10.1039/d0ra07660k

Study on the performance of NiO/Zn _x Zr_{1- x} catalysts for CO₂ hydrogenation

RSC Adv. 2020 Nov 25;10(70):42790-42798. doi: 10.1039/d0ra07660k. eCollection 2020 Nov 23.

Authors

Shuai Chang^{1

2}, Wenshuo Mao^{3

2}, Wei Na^{1

4}, Wengui Gao^{1

4}, Gaocheng Qu^{3

2}, Hua Wang^{1

4

2}

Affiliations

¹ Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology Kunming 650093 China gao_wengui@126.com.
² Engineering Research Center of Metallurgical Energy Conservation and Emission Reduction, Ministry of Education, Kunming University of Science and Technology Kunming 650093 China.
³ Faculty of Chemical Engineering, Kunming University of Science and Technology Kunming 650093 China.
⁴ State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology Kunming 650093 China.

Abstract

The NiO/Zn _x Zr_1-x (x represents the molar mass of Zn) catalyst was prepared by the impregnation method and tested in CO₂ methanation. The activity results show that NiO/Zn_0.3Zr_0.7 has a higher CO₂ conversion rate and methane selectivity than NiO/ZnO and NiO/ZnO-ZrO₂. Combined with N₂ adsorption-desorption, H₂-TPR, CO₂-TPD, H₂-TPD, XRD, TEM, XPS and FTIR and other characterization methods, the physical and chemical properties of NiO/ZnO-ZrO₂ were studied. The incorporation of ZnO into NiO/ZrO₂ forms a ZnO-ZrO₂ 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 H₂-TPR experiment results show that, because ZnO-ZrO₂ 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 CO₂ adsorption and methanation experiments on NiO/Zn _x Zr_1-x to determine the adsorbed species and intermediates, the results show that CO₂ methanation follows the formate pathway.