"This review provides an extensive evaluation of recent advances in multiscale models used for the theoretical physical descriptions of #DirectAirCapture."
🧵 1/8
"Reviewed (CO2 mass) transfer works span from the ab initio density functional theory calculation relationships to mesoscale Monte Carlo, molecular dynamics simulations & micro-kinetics, adsorption/desorption, & most commonly-investigated specific macroscale concept." #DAC 2/8
The modelled #DAC processes properties reported in the literature have been compared by the authors of this review paper, which allowed them "to identify the most effective sorbents." 3/8
This paper found that "Amine functionalized metal-organic frameworks exhibit low energy requirements, the lowest reported was 1000 kWh tCO2−1, while the lowest published cost was 60 $ tCO2−1." #DAC 4/8
Researchers also figured out that "the market demand for CO2 is expected to exponentially rise up to 6.1 Gt in 2050, while the cost of implementing #DAC technologies is predicted to be reduced under 125 $ tCO2−1 in the year 2030." 5/8
This paper concluded that, "further #DAC modelling research activities in CO2 (sorption) bed form phenomena could not only break the barriers of current renewable tech., but also couple the CO2 reactions with the sequestration, reactors, or with electrolysis for e-fuels." 6/8
🚨🗓We launched the first-of-its-kind Solar Geoengineering Events Calender last year, to create the go-to public resource for anyone tracking key events in #SRM. From conferences to job deadlines, we update it regularly.
📰 Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (07 April - 13 April 2025):
🔗:
🧵0/21
CO280 signed a landmark 3.69 million tonne agreement with Microsoft over 12 years to scale-up carbon dioxide removal in the us pulp and paper industry.
Occidental and its subsidiary 1PointFive have secured the first-ever Class VI permits issued by the U.S. Environmental Protection Agency for sequestering CO2 from direct air capture operations.
🚨A new study from China introduced a groundbreaking system that couples liquid-based direct air capture (L-DAC) with diabatic compressed air energy storage (D-CAES). This integration captures CO₂ & stores energy at competitive costs—$0.53/kWh & $259/tCO₂. #DAC
DETAILS🧵1/8
2/ Led by researchers at East China University of Science & Technology and Tongji University, the system innovatively combines solvent-based CO₂ capture for both atmospheric and point-source emissions with energy storage.
3/ In the L-DAC component, ambient air is brought into contact with a sprayed alkaline solution.
This reaction converts CO₂ into a carbonate solution that precipitates as solid carbonates—capturing roughly 1 Mt of CO₂ and delivering 1.48 Mt dry CO₂ annually.
🚨A recent study shows that bottom trawling & dredging not only harm marine ecosystems but also reduce the ocean's capacity to sequester CO₂. By disturbing the seafloor, these activities release an extra 2-8MtCO₂/yr, threatening the progress of current #CDR efforts.🧵1/10
2/ The seafloor contributes to 40% of the ocean’s alkalinity, which plays a key role in the ocean’s capacity to sequester atmospheric CO₂. However, human activities like mobile bottom-contact fishing (e.g., trawling) and dredging are disturbing this natural carbon sink.
3/ Model simulations of this study revealed:
Bottom trawling alone reduces alkalinity production by around 130 [55–220] Gequiv/yr, while dredging contributes an additional 1.5 [0.8–2.7] Gequiv/yr. Combined, these activities lead to a net loss of 130 [56–220] Gequiv/yr.