Nitrogen enriched biochar used as CO2 adsorbents: a brief review

Qiao, Yuanting; Wu, Chunfei

doi:10.1016/j.ccst.2021.100018

Cited by 44 publications

(15 citation statements)

References 106 publications

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“…As shown in Table 2, the specific surface area of NBC was hard to calculate, and the pore structure of NBC was destroyed, which was attributed to the pore-filling effects of the nitrogen. 31 It is in line with the results observed by Qiao et al 32 The collapse of the pore structure of biochar due to the pore-filling effects of nitrogen has a negative impact on gas production.…”

Section: Effect Of N-doped Biochar On Pyrolysis Product Distribution ...supporting

confidence: 89%

Evaluation of Engineered Biochar-Based Catalysts for Syngas Production in a Biomass Pyrolysis and Catalytic Reforming Process

et al. 2023

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Biochar, originating from biomass pyrolysis, has been proven a promising catalyst for tar cracking/reforming with great coke resistance. This work aims to evaluate various engineered biochar-based catalysts on syngas production in a biomass pyrolysis and catalytic reforming process without feeding extra steam. The tested engineered biochar catalysts include physical-and chemical-activated, nitrogen-doped, and nickel-doped biochars. The results illustrated that the syngas yields were comparable when using biochar and activated biochar as catalysts. A relatively high specific surface area (SSA) and a hierarchical porous structure are beneficial for syngas and hydrogen production. A 2 h physical-activated biochar catalyst induced the syngas with the highest H 2 /CO ratio (1.5). The use of N-doped biochar decreased the syngas yield sharply due to the collapse of the pore structure but obtained syngas with the highest LHV gas (18.5MJ/Nm 3 ). The use of Ni-doped biochar facilitated high syngas and hydrogen yields (78.2 wt % and 26 mmol H 2 /g-biomass) and improved gas energy conversion efficiency (73%). Its stability and durability test showed a slight decrease in performance after a three-time repetitive use. A future experiment with a longer time is suggested to determine when the catalyst will finally deactivate and how to reduce the catalyst deterioration.

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Section: Effect Of N-doped Biochar On Pyrolysis Product Distribution ...supporting

confidence: 89%

Evaluation of Engineered Biochar-Based Catalysts for Syngas Production in a Biomass Pyrolysis and Catalytic Reforming Process

et al. 2023

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“…It has been pointed out that the introduction of heteroatoms improved the CO 2 uptake in carbon materials, which was due to the enhancement of surface alkalinity [2]. N doping is the most widely studied doping method, which can not only regulate pore structure but also enrich the N-containing groups in carbon materials, thus promoting CO 2 adsorption [82]. Generally, the forms of N-containing groups include pyridone, cyanide, pyrrole, pyridine, amine, quaternary, and pyridine-N-oxide, the structure of which is shown in Fig.…”

Section: Heteroatom Dopingmentioning

confidence: 99%

Biomass-based carbon materials for CO2 capture: A review

Quan

Zhou

Wang

et al. 2023

Journal of CO2 Utilization

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“…Biochar's fixed carbon and aromatic carbon contents are generally proportional to the increase in pyrolysis temperature, implying the removal of volatile materials, and that properties can be used as a proxy for biochar stability in thermochemical mode (Kannan et al 2017;Manyà et al 2014). As a result, biochar is considered an effective tool for long-term carbon sequestration (Qambrani et al 2017;Ghani et al 2013;Qiao and Wu 2022).…”

Section: Role Of Biochar From Digestate In Climate Change Mitigationmentioning

confidence: 99%

Integration of biogas systems into a carbon zero and hydrogen economy: a review

et al. 2022

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The Ukraine conflict has put critical pressure on gas supplies and increased the price of fertilisers. As a consequence, biogas has gained remarkable attention as a local source of both gas for energy and biofertiliser for agriculture. Moreover, climate change-related damage incentivises all sectors to decarbonise and integrate sustainable practices. For instance, anaerobic digestion allows decarbonisation and optimal waste management. Incorporating a biogas system in each country would limit global warming to 2 °C. If suitable policies mechanisms are implemented, the biogas industry could reduce global greenhouse gas emissions by 3.29–4.36 gigatonnes carbon dioxide equivalent, which represent about 10–13% of global emissions. Here, we review the role of the biogas sector in capturing methane and mitigating carbon emissions associated with biogas outputs. Since biogas impurities can cause severe practical difficulties in biogas storing and gas grid delivering systems, we present upgrading technologies that remove or consume the carbon dioxide in raw biogas, to achieve a minimum of 95% methane content. We discuss the role of hydrogen-assisted biological biogas upgrading in carbon sequestration by converting carbon dioxide to biomethane via utilising hydrogen generated primarily through other renewable energy sources such as water electrolysis and photovoltaic solar facilities or wind turbines. This conceptual shift of 'power to gas' allows storing and utilising the excess of energy generated in grids. By converting carbon dioxide produced during anaerobic digestion into additional biomethane, biogas has the potential to meet 53% of the demand for fossil natural gas. We also evaluate the role of digestate from biogas systems in producing biochar, which can be used directly as a biofertiliser or indirectly as a biomethanation enhancement, upgrading, and cleaning material.

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Nitrogen enriched biochar used as CO2 adsorbents: a brief review

Cited by 44 publications

References 106 publications

Evaluation of Engineered Biochar-Based Catalysts for Syngas Production in a Biomass Pyrolysis and Catalytic Reforming Process

Evaluation of Engineered Biochar-Based Catalysts for Syngas Production in a Biomass Pyrolysis and Catalytic Reforming Process

Biomass-based carbon materials for CO2 capture: A review

Integration of biogas systems into a carbon zero and hydrogen economy: a review

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