Wheat-Straw-Derived Activated Biochar as a Renewable Support of Ni-CeO 2 Catalysts for CO 2 Methanation

Christian Di Stasi, Simona Renda, Gianluca Greco, Belén González, Vincenzo Palma and Joan J. Manyà
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Christian Di Stasi: Aragón Institute of Engineering Research (I3A), Thermochemical Processes Group, Escuela Politécnica Superior-University of Zaragoza, Crta. Cuarte s/n, 22071 Huesca, Spain
Simona Renda: Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, SA, Italy
Gianluca Greco: Aragón Institute of Engineering Research (I3A), Thermochemical Processes Group, Escuela Politécnica Superior-University of Zaragoza, Crta. Cuarte s/n, 22071 Huesca, Spain
Belén González: Aragón Institute of Engineering Research (I3A), Thermochemical Processes Group, Escuela Politécnica Superior-University of Zaragoza, Crta. Cuarte s/n, 22071 Huesca, Spain
Vincenzo Palma: Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, SA, Italy
Joan J. Manyà: Aragón Institute of Engineering Research (I3A), Thermochemical Processes Group, Escuela Politécnica Superior-University of Zaragoza, Crta. Cuarte s/n, 22071 Huesca, Spain

Sustainability, 2021, vol. 13, issue 16, 1-13

Abstract: Ceria- and urea-doped activated biochars were used as support for Ni-based catalysts for CO 2 methanation purposes. Different materials were prepared and tested to find the best catalytic formulation. After several CO 2 methanation experiments—carried out at 0.35–1.0 MPa and 300–500 °C—it was found that the most suitable catalyst was a wheat-straw-derived activated biochar loaded with 30 wt.% of CeO 2 and 20 wt.% of Ni. Using this catalyst, a CO 2 conversion of 65% with a CH 4 selectivity of 95% was reached at 1.0 MPa, 400 °C, and 13,200 h ?1 . From the study of the influence of the gas hourly space velocity, it was deduced that the most likely reaction mechanism was a reverse water–gas shift reaction, followed by CO hydrogenation. N-doping of the carbon support as an alternative to the use of ceria was also investigated. However, both CO 2 conversion and selectivity toward CH 4 values were clearly lower than those obtained for the ceria-containing catalyst cited above. The outcomes of this work indicate that a renewable biomass-derived support can be effectively employed in the catalytic conversion of CO 2 to methane.

Keywords: CO 2 methanation; Sabatier reaction; biochar; urea; ceria (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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