Vanadium promoted Ni(Mg,Al)O hydrotalcite-derived catalysts for CO2 methanation

A series of V-promoted hydrotalcite-derived nickel catalysts (1.0, 2.0, and 4.0 wt%) were tested in CO2 methanation. Ni-I-V2.0 with 2.0 wt% vanadium loading showed the highest catalytic activity, achieving 74.7% of CO2 conversion and 100% of CH4 selectivity at 300 ?C. XRD and XANES analyses showed that the smallest Ni0 particles in Ni-I-V2.0 were consistent with the improved textural features observed for this catalyst. Moreover, CO2TPD revealed the highest sum of weak and medium basic sites in Ni-I-V2.0 that can positively influence catalytic behavior. For the studied catalysts, a clear correlation was demonstrated between the catalytic activity and specific surface area, as well as the basic properties. ? 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

In this study, a series of V-promoted hydrotalcite-derived nickel catalysts were tested for CO2 methanation, with Ni-I-V2.0 showing the highest catalytic activity at 2.0 wt% vanadium loading. XRD and XANES analyses revealed the smallest Ni0 particles in Ni-I-V2.0 and improved textural features, while CO2TPD showed the highest sum of weak and medium basic sites in Ni-I-V2.0 that can positively influence catalytic behavior.