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On the role of ceria in Ni-Al2O3 catalyst for CO2 plasma methanation

AuthorsBiset-Peiró, Martí; Guilera, Jordi; Zhang, Ting ; Arbiol, Jordi ; Andreu, Teresa
CO2 methanation
DBD plasma
Ceria-nickel-aluminia catalyst
Issue Date2019
CitationApplied Catalysis A: General 575: 223-229 (2019)
AbstractThe effect of Ce loading content on Ni-CeO2/Al2O3 catalysts for CO2 plasma methanation was evaluated. Catalysts were prepared by one-pot evaporation-induced self-assembly, Ni content was fixed at 15 wt. %, while CeO2 ranged 0–50 wt. %. The catalysts performances were tested under atmospheric pressure in two operation modes, thermal- and plasma-catalysis. As for conventional thermal catalysis, the catalyst was thermally activated between 200 and 400 °C; while in plasma-catalysis, the catalyst was activated by plasma generated by a dielectric barrier discharges (DBD) reactor. By the application of plasma in the catalyst bed, the reaction temperature was reduced from 350 °C to 150 °C to obtain the same level of conversion than thermal-catalysis. In addition, the incorporation of Ce in Ni-CeO2/Al2O3 led to an improvement of the catalytic performance in both thermal- and plasma-catalysis. Nevertheless, divergences on the optimum Ce content were found. On plasma experiments, the catalyst was more active at a lower amount of CeO2 (˜10 wt.%) with respect to thermal catalysis (˜40 wt.%), reducing the catalyst fabrication cost. Those differences highlights that the CO generated by plasma CO2 dissociation has a significant role for methane production, and thus the need to consider the by-products as reactant for the optimization of catalysts composition for DBD plasma-catalysis.
Publisher version (URL)https://doi.org/10.1016/j.apcata.2019.02.028
Appears in Collections:(CIN2) Artículos
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