TY - GEN A1 - González-Castaño, Miriam A1 - González-Arias, Judith A1 - Sánchez, Marta Elena A1 - Cara-Jiménez, Jorge A1 - Arellano-García, Harvey T1 - Syngas production using CO2-rich residues: From ideal to real operating conditions T2 - Journal of CO2 utilization KW - RWGS KW - Cu-Mn catalyst KW - CO2-rich residual gas KW - alumina KW - SiO2 KW - CeO2 Y1 - 2021 U6 - https://doi.org/10.1016/j.jcou.2021.101661 SN - 2212-9839 VL - 52 ER - TY - GEN A1 - González-Arias, Judith A1 - González-Castaño, Miriam A1 - Sánchez, Marta Elena A1 - Cara-Jiménez, Jorge A1 - Arellano-García, Harvey T1 - Valorization of biomass-derived CO2 residues with Cu-MnOx catalysts for RWGS reaction T2 - Renewable Energy N2 - This study delivers useful understanding towards the design of effective catalytic systems for upgrading real CO2erich residual streams derived from biomass valorization. Within this perspective, a catalysts' series based on (5 wt%) Cu - (X wt%) Mn/Al2O3with X¼0, 3, 8, and 10 is employed. The improved catalyst performance achieved through Mn incorporation is ascribed to enhanced Cu dispersions and promoted surface basic concentrations. Under standard RWGS conditions, the highest reaction rates achieved by(5 wt%) Cu - (8 wt%) Mn/Al2O3catalyst were associated to improved Cu dispersions along with the constitution of highly active Cu-MnOxdomains. Remarkably, variations on the optimal Cu to Mn ratios were detected as a function of the RWGS reaction conditions. Thus, under simulated CO2-rich residual feedstock's, i.e., in presence of CO and CH4, the further promotion on the Cu dispersion attained by the larger amounts of MnOxrendered the (5 wt%) Cu - (10 wt%) Mn/Al2O3catalyst as the best performing sample. Overall, the presented outcomes underline operative strategies for developing catalytic systems with advanced implementation potentialities. KW - CO2 waste valorization KW - CO2-Rich residues KW - Reverse water gas shift KW - CO2 reduction KW - Cu-catalysts KW - Manganese oxide Y1 - 2022 U6 - https://doi.org/10.1016/j.renene.2021.10.029 SN - 1879-0682 IS - 182 SP - 443 EP - 451 ER - TY - GEN A1 - González-Arias, Judith A1 - Gomez, X. A1 - Gonzalez-Castano, Miriam A1 - Sanchez, Marta Elena A1 - Rosas, J. G. A1 - Cara-Jiménez, Jorge T1 - Insights into the product quality and energy requirements for solid biofuel production: A comparison of hydrothermal carbonization, pyrolysis and torrefaction of olive tree pruning T2 - Energy N2 - For a bio-economy establishment, understanding the energy consumption needs to produce solid biofuels is a key point. Herein, olive tree pruning was treated by both dry (pyrolysis and torrefaction) and wet (hydrothermal carbonization) thermal treatments. Product yield, solid quality and energy consumption were assessed. The solids were characterized by means of chemical and thermogravimetric analysis. For all treatments, coal-like solid products were obtained, with higher heating values (HHV) of almost 30 MJ kg−1 in most of the conditions evaluated. Chars from pyrolysis presented the greater carbon content (between 76 and 85 wt%) but also the higher ash content (ranging from 6 to 9 wt%). From an energy consumption perspective, torrefaction registered the lowest energy consumption (between 5.85 and 20.76 MJ kg−1 char). The highest energy contents per kilogram of char produced were also reflected in torrefaction samples, with values around 11 MJ kg−1 char. Although the obtained HHVs were greater for pyrolysis chars the higher mass yields obtained in torrefaction makes it more profitable. The least severe conditions allowed to obtain a positive energy balance only with the solid phase considered. Nonetheless, further room for improvement is possible since the gas and liquid phases may also be valorised. KW - Hydrothermal carbonization KW - Slow pyrolysis KW - Torrefaction KW - Olive tree pruning KW - Biofuel Y1 - 2021 U6 - https://doi.org/10.1016/j.energy.2021.122022 SN - 0360-5442 VL - Vol. 238, part C (2022) ER -