The activity of Ceria-Zirconia supported Ni catalysts was measured in a hybrid cold dielectric barrier discharge (DBD) plasma-catalytic process for the hydrogenation of carbon dioxide into methane at low temperatures. Hydrogen DBD plasma treatment at room temperature was chosen as an alternative activation to conventional reduction performed at high temperature. The plasma-catalytic tests performed in the presence of the plasma-treated catalyst clearly show that the hydrogen plasma treatment can replace the high-temperature reduction in hydrogen.
International audienceThe activity of Ceria and Zirconia-promoted Ni-containing hydortalcite-derived catalysts was assayed in a hybrid plasma-catalytic process for the hydrogenation of carbon dioxide into methane at low temperatures and in the presence of a cold dielectric barrier discharge (DBD) plasma. High methane yields, around 80%, were measured under hybrid plasma-catalytic conditions, even at very low temperatures (110°C, adiabatic conditions). In the absence of plasma, acceptably high CO 2 conversions and methane yields were only observed at temperatures higher than 330°C. The presence of completely reduced Ni-crystallites of intermediate size, more readily available on the non-promoted catalysts was found to enhance the methanation reaction. Ce and Zr addition did not result in a noticeable improvement of the catalytic activity
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