Direct air capture (DAC) is the use of chemical or physical processes to extract carbon dioxide directly from the ambient air. If the extracted is then sequestered in safe long-term storage (called direct air carbon capture and sequestration (DACCS)), the overall process will achieve carbon dioxide removal and be a "negative emissions technology" (NET). As of 2022, DAC has yet to become profitable because the cost of using DAC to sequester carbon dioxide is several times the carbon price. The carbon dioxide () is captured directly from the ambient air; this is contrast to carbon capture and storage (CCS) which captures from point sources, such as a cement factory or a bioenergy plant. After the capture, DAC generates a concentrated stream of for sequestration or utilization or production of carbon-neutral fuel and windgas. Carbon dioxide removal is achieved when ambient air makes contact with chemical media, typically an aqueous alkaline solvent or sorbents. These chemical media are subsequently stripped of CO2 through the application of energy (namely heat), resulting in a CO2 stream that can undergo dehydration and compression, while simultaneously regenerating the chemical media for reuse. When combined with long-term storage of , DAC is known as direct air carbon capture and storage (DACCS or DACS). It would require renewable energies to power since approximately 400kJ of energy is needed per mole of CO2 capture. DACCS can act as a carbon dioxide removal mechanism (or a carbon negative technology), although it has yet to be profitable because the cost per tonne of carbon dioxide is several times the carbon price. DAC was suggested in 1999 and is still in development. Several commercial plants are planned or in operation in Europe and the US. Large-scale DAC deployment may be accelerated when connected with economical applications or policy incentives. In contrast to carbon capture and storage (CCS) which captures emissions from a point source such as a factory, DAC reduces the carbon dioxide concentration in the atmosphere as a whole.

About this result
This page is automatically generated and may contain information that is not correct, complete, up-to-date, or relevant to your search query. The same applies to every other page on this website. Please make sure to verify the information with EPFL's official sources.
Related courses (9)
ENG-410: Energy supply, economics and transition
This course examines energy systems from various angles: available resources, how they can be combined or substituted, their private and social costs, whether they can meet the energy demand, and how
HUM-226: Wellbeing and Planetary Boundaries
L'objectif de ce cours est de donner une compréhension globale des enjeux de la durabilité et de ses implications. Que signifie "durabilité" ? Comment est-elle mesurée ? Comment l'atteindre ?
ME-104: Introduction to structural mechanics
The student will acquire the basis for the analysis of static structures and deformation of simple structural elements. The focus is given to problem-solving skills in the context of engineering desig
Show more
Related lectures (45)
MOF Applications: Storage, Separation, Sensing
Explores MOF applications in storage, separation, and sensing, emphasizing their role in reducing energy input and capturing carbon dioxide.
Reducing GHG Emissions: Strategies and Innovations
Explores strategies and innovations to reduce greenhouse gas emissions and emphasizes the importance of continuous progress in energy efficiency and renewables.
Limits to using markets as energy allocation mechanism
Discusses illustrative model pathways for achieving net emissions reductions and the challenges in transitioning to sustainable energy systems.
Show more
Related publications (261)
Related concepts (16)
Bioenergy with carbon capture and storage
Bioenergy with carbon capture and storage (BECCS) is the process of extracting bioenergy from biomass and capturing and storing the carbon, thereby removing it from the atmosphere. BECCS can be a "negative emissions technology" (NET). The carbon in the biomass comes from the greenhouse gas carbon dioxide (CO2) which is extracted from the atmosphere by the biomass when it grows. Energy ("bioenergy") is extracted in useful forms (electricity, heat, biofuels, etc.
Carbfix
Carbfix is an Icelandic company that has developed an approach to capturing and storing CO2 in water, and its injection into subsurface basalts. Once in the subsurface, the injected CO2 reacts with the host rock forming stable carbonate minerals, thus providing storage of the captured gas. Approximately 200 tons of CO2 were injected into subsurface basalts in 2012. Research results published in 2016 showed that 95% of the injected CO2 was solidified into calcite within 2 years, using 25 tons of water per tonne of CO2.
Carbon-neutral fuel
Carbon-neutral fuel is fuel which produces no net-greenhouse gas emissions or carbon footprint. In practice, this usually means fuels that are made using carbon dioxide (CO2) as a feedstock. Proposed carbon-neutral fuels can broadly be grouped into synthetic fuels, which are made by chemically hydrogenating carbon dioxide, and biofuels, which are produced using natural CO2-consuming processes like photosynthesis. The carbon dioxide used to make synthetic fuels may be directly captured from the air, recycled from power plant flue exhaust gas or derived from carbonic acid in seawater.
Show more

Graph Chatbot

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.