Wheat-Straw-Derived Activated Biochar as a Renewable Support of Ni-CeO2 Catalysts for CO2 Methanation

Abstract

Ceria- and urea-doped activated biochars were used as support for Ni-based catalysts for CO2 methanation purposes. Different materials were prepared and tested to find the best catalytic formulation. After several CO2 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 CeO2 and 20 wt.% of Ni. Using this catalyst, a CO2 conversion of 65% with a CH4 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 CO2 conversion and selectivity toward CH4 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 CO2 to methane.

Research Advances on Nitrogen-Doped Carbon Materials in COx Hydrogenation

“…Methane is characterized by its easy storage and transportation, and it can be used as a fuel and a precursor for the production of other chemicals [115,116]. Stasi et al [117] proved the potential of N doping to enhance the performance of catalysts for CO 2 hydrogenation to methane. The authors introduced Ce and N separately into Ni-based catalysts and compared their catalytic effects.…”

Recent Solutions for Efficient Carbonyl Sulfide Hydrolysis: A Review

“…The interest toward carbon-based materials has progressively increased in the past 10 years, 37,38 mostly because of the relatively low environmental impact resulting in their employment in a wide number of applications, for example, hydrocarbon conversion 39,40 and synthesis. 41,42 Also, in the scenario of environmental catalysis, activated carbons (AC) and biochar have been extensively studied and applied for removal treatments. Activated carbons are well-known coal-derived materials, with a widespread application in wastewater treatment and H 2 S adsorption.…”

“…The interest toward carbon-based materials has progressively increased in the past 10 years, , mostly because of the relatively low environmental impact resulting in their employment in a wide number of applications, for example, hydrocarbon conversion , and synthesis. , Also, in the scenario of environmental catalysis, activated carbons (AC) and biochar have been extensively studied and applied for removal treatments. Activated carbons are well-known coal-derived materials, with a widespread application in wastewater treatment and H 2 S adsorption. − They are actually expensive materials, as they require high energy-intensive thermal activation in order to achieve the desirable adsorption properties. , On the other hand, biochar is less costly, and more important, it is a biomass-derived material, so even more environmentally friendly.…”

Research and Application of Carbon Capture, Utilization, and Storage–Enhanced Oil Recovery Reservoir Screening Criteria and Method for Continental Reservoirs in China

“…If the environmental impacts of human activities will not be controlled, these issues are expected to worsen rapidly in the coming decades [7]. Carbon capture and utilization (CCU) technologies, including Power-to-Gas (PtG) [8], Power-to-Liquid (PtL) [9], and CO 2 -Enhanced Oil Recovery (CO 2 -EOR) [10], in conjunction with carbon capture and storage (CCS) methods like physical absorption and chemical absorption [11], form a comprehensive carbon capture, utilization, and storage (CCUS) technology, which has been proven to be effective for mitigating climate change and achieving sustainable development [12]. It is a crucial tool for reducing carbon emissions in sectors such as coal-fired power generation, cement, and steel production [13].…”