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Influence of Mn amount in Ni-Mn-Al LDH derived catalysts in the CO2 hydrogenation at low temperature
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DOI：10.1016/j.cattod.2026.115870.png)
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Abstract
En 中文
CO2 methanation has attracted significant scientific interest, as it offers a pathway to mitigate global warming by converting CO2 into methane, a fuel compatible with established market infrastructure. When integrated with methane combustion, these processes generate energy with steam as the only atmospheric emissions. The challenge lies in the development of non-noble metal catalysts that are both active and selective for CO2 methanation at low temperatures. In this study, layered double hydroxides containing Ni, Mn, and Al with different manganese to aluminum ratios were synthesized using a constant pH coprecipitation method, which is simple, eco-friendly, low-cost, and highly reproducible. The effects of replacing Al with Mn on the structural, thermal, electronic and basic properties were investigated using XRD, ICP-OES, TGA, FTIR, N2 adsorption/desorption, H2-TPR, CO-DRIFTS and CO2-TPD analyses. Catalytic evaluation at 225 °C revealed that the catalyst with 25% of the Al replaced by Mn (Mn-25-r) achieved 58% CO2 conversion with 100% selectivity towards methane, representing one of the most effective catalysts using transition metals. The enhanced activity was attributed to increased basicity resulting from Mn incorporation in the materials. Moreover, it also promoted the presence of carbonate species formed on the MnO phases and/or a weakening of the C=O bond of carbon monoxide absorbed on the nickel metal surface, due to changes in metal-support interaction, which may have favored CO methanation routes at lower temperatures.
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