Integrating capture and methanation of CO2 using physical mixtures of Na-Al2O3 and mono-/ bimetallic (Ru)Ni/Pr-CeO2

Tsiotsias, Anastasios I. ; Charisiou, Nikolaos D. ; Hussien, Aseel G.S. ; Sebastian, Victor (Universidad de Zaragoza) ; Polychronopoulou, Kyriaki ; Goula, Maria A.

Resumen: The integrated capture and methanation of CO2 is hereby realized via the use of physical mixtures of a 12 % Na2O/Al2O3 adsorbent and either a monometallic (10 % Ni/Pr-CeO2) or a bimetallic (1 % Ru, 10 % Ni/Pr–CeO2) catalyst. The effect of the weight ratio between the catalyst and the adsorbent components is studied and it is found to exert a great influence in the reaction kinetics and the CH4 production capacity, with the 1:3 catalyst: adsorbent weight ratio (2.5 wt% Ni for both physically mixed materials and 0.25 wt% Ru for the bimetallic material) providing the highest CH4 yield. It is further shown that the materials offer high activity, stability and CH4 selectivity at just 300 °C, even under the co–presence of O2 and H2O during CO2 adsorption, a fact attributable to the preservation of the Ni-CeO2 contact, which is known to afford a high reducibility to the catalytically active Ni phase. The presence of Ru can further enhance the material reducibility and activity under low operation temperatures and catalyst: adsorbent weight ratios, while also mitigating the negative effect of the O2 and H2O presence in the adsorption feed. A CH4 yield of 0.24 mmol/g after 10 consecutive cycles of CO2 adsorption (under O2 and H2O containing gas) and methanation is achieved for the monometallic Ni-based physically mixed material, compared to 0.29 mmol/g in the case of the Ru–Ni bimetallic physically mixed material.

Idioma: Inglés

DOI: 10.1016/j.cej.2024.151962

Año: 2024

Publicado en: Chemical Engineering Journal 491 (2024), 151962 [18 pp.]
ISSN: 1385-8947

Factor impacto JCR: 13.2 (2024)

Categ. JCR: ENGINEERING, ENVIRONMENTAL rank: 3 / 83 = 0.036 (2024) - Q1 - T1
Categ. JCR: ENGINEERING, CHEMICAL rank: 8 / 175 = 0.046 (2024) - Q1 - T1

Factor impacto SCIMAGO: 2.696 - Environmental Chemistry (Q1) - Industrial and Manufacturing Engineering (Q1) - Chemistry (miscellaneous) (Q1) - Chemical Engineering (miscellaneous) (Q1)

Tipo y forma: Article (Published version)

Área (Departamento): Área Ingeniería Química (Dpto. Ing.Quím.Tecnol.Med.Amb.)