CO and CO2 Co-Methanation on Ni/CeO2-ZrO2 Soft-Templated Catalysts

Catalysts

Elisabetta Rombi¹  MariaGiorgia Cutrufello¹  MariaFranca Sini¹  Roberto Monaci¹  Daniela Meloni¹  Luciano Atzori¹ 

[1] Dipartimento di Scienze Chimiche e Geologiche, Università di Cagliari, 09124 Cagliari, Italy;

关键词: carbon oxides;    co-methanation;    nickel-based catalysts;    CeO₂-ZrO₂ supports;    soft-template method;   

DOI  :  10.3390/catal9050415

来源: DOAJ

【 摘 要 】

Supported nickel catalysts were synthesized, characterized, and employed in the carbon oxides co-methanation process. Five NiO/CeO₂-ZrO₂ mixed oxides, with the same Ni content and different Ce/Zr molar ratios, were prepared by the soft-template method. They were characterized through ICP-AES, N₂ adsorption, XRD, and TPR. Reduced Ni/CeO₂-ZrO₂ catalysts were obtained by submitting the oxide systems to reduction treatment in H₂ at 400 °C. They were characterized by XRD, H₂-TPD, and CO₂ adsorption microcalorimetry and their catalytic performances in the carbon oxides co-methanation were investigated. Catalytic tests were performed in a fixed-bed continuous-flow microreactor at atmospheric pressure. The effect of experimental conditions (reaction temperature, space velocity, reactants molar ratio) was also studied. Almost complete CO conversion was obtained on any catalyst, whereas CO₂ conversion was much lower and increased with Ce content, at least up to Ce/Zr = 1. The beneficial effect of the Ce content could be related to the increased NiO reducibility and to the higher ability to adsorb and activate CO₂. However, at high Ce/Zr ratios, it is probably counterbalanced by an interplay of reactions involving CO and CO₂.

【 授权许可】

Unknown