The production of synthetic natural gas in the context of power-to-gas is a promising technology for the utilization of CO₂. Ni-based catalysts supported on carbon nanotubes (CNTs) were prepared through incipient wetness impregnation and characterized using N₂ adsorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), and temperature-programmed reduction (TPR). The catalysts were tested for CO₂ methanation in the 200–400 °C temperature range and at atmospheric pressure. The results demonstrated that the catalytic activity increased with the addition of the CNTs and Ni loading. The selectivity towards CH₄ was close to 100% for the Ni/ZrO₂/CNT catalysts. Reduction of the calcined catalyst at 500 °C using H₂ modified the surface chemistry of the catalyst, leading to an increase in the Ni particles. The CO₂ conversion was dependent on the Ni loading and the temperature reduction in the NiO species. The 10Ni/ZrO₂/CNT catalyst was highly stable in CO₂ methanation at 350 °C for 24 h. Thus, CNTs combined with Ni and ZrO₂ were considered promising for use as catalysts in CO₂ methanation at low temperatures.

Carbon dioxide (CO2) emissions have produced global concern due to their impact on global warming. Therefore, adsorption methodologies have emerged as an alternative to mitigate this problem. Here, we synthesized a series of Zr-functionalized SBA-15 materials using the pH-adjusting method, varying the Si/Zr ratio to assess CO2 adsorption. The materials were fully characterized revealing the formation of mesoporous SBA-15 with Zr species effectively introduced into the framework, generating basic sites to improve CO2 adsorption capacity, where the Zr-SBA-15-10 sample stood out from others with 7.44 mg/g. Finally, pseudo-first-order (PFO) kinetics best described the adsorption process for all samples.