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Nickel-zirconia mixed oxide catalyst for CO2 methanation: Impact of facile coprecipitation on catalytic performance
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DOI：10.1016/j.mseb.2026.119427.png)
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Abstract
En 中文
In this investigation, various simple precipitation routes, including coprecipitation using potassium carbonate or sodium hydroxide, and a two-step precipitation, were employed to prepare NiO-ZrO2 mixed oxide catalyst precursor for the CO2 methanation reaction. Among the studied samples, the most active catalyst was further selected to systematically investigate the influence of several reaction parameters, including the CO2/H2 molar ratio, the inert balance gas content, and the gas hourly space velocity (GHSV) value. The result in this work highlights the impact of choosing the precipitation route for engineering structure-defect properties of Ni-ZrO2 catalyst. Fine dispersion of Ni and Zr induced by coprecipitation could promote the formation of cubic ZrO2 phase with higher oxygen vacancy density, leading to better ability to adsorb and activate CO2. The choice of using potassium carbonate as a suitable precipitation agent significantly elevated the performance of the Ni-cubic ZrO2 catalyst, which was even superior to the Ni-monoclinic ZrO2 obtained via the two-step precipitation or Ni/ monoclinic ZrO2 in several reported literature. Comprehensive characterization indicated that the enhanced performance was attributed to a smaller Ni0 crystallite size (13.6 nm), an acceptable specific surface area (63.9 m2 center dot g(-1)), a stronger metal-support interaction, and suitable surface basicity. Although the use of advanced technique could lead to a superior performance of Ni/ZrO2 observed in other study, the results in this work provided an essential foundation for further development of a highly active NiO-ZrO2-based catalyst that could bridge the performance gap between simple preparation routes and modern catalyst engineering approaches.
Keywords:
Precipitation
Precipitation agent
CO2 methanation
Zirconia
Nickel
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