Direktluftinfångning: Hur en nästa generations reaktor kan bli allmänt antagen

A team of innovative engineers from Rice University has achieved a major milestone in the carbon capture industry with their latest development that could revolutionize the market. The researchers successfully created an electrochemical reactor that can enhance carbon capture from the atmosphere with unmatched efficiency and no harmful byproducts. Here’s how this new direct air capture method could make the world one step closer to achieving net-zero carbon emissions in the future.

Utsläpp når nya höjder och leder till klimatkatastrofer

A rapport publicerad i BioScience som studerar det aktuella klimatläget fann att världen är “på gränsen till en oåterkallelig klimatkatastrof.” Samma studie visade att utsläppen från fossila bränslen har ökat till en historisk topp. Denna tillväxt framhölls av det faktum att de tre varmaste dagarna någonsin inträffade i juli 2024. Dessutom slog havsytans temperatur nya rekord 2024 i flera regioner.

All denna klimatdata pekar på den obestridliga faktan att det är dags för regeringar att ta initiativet. Lyckligtvis finns det flera tillvägagångssätt att välja mellan. Att driva hållbarhet och förnybarhet ligger i centrum för detta tillvägagångssätt. Från att främja fler elbilar och alternativa energikällor till att beskatta slösaktiga tillverkare, finns det lösningar som är värda att följa.

Notably, there isn’t one option that can solve this problem. People will need to change their habits alongside technological advancements to achieve victory. One such tech, Carbon capture, usage, and storage (CCUS) is seen as one of the best ways to help achieve these goals.

Direktluftinfångning – nuvarande metoder

Reducing carbon emissions is a priority for environmentalists globally. Notably, direct air capture is the most popular method of removing CO₂ from the atmosphere. There are several ways that this process can be initiated. However, they all require the use of dangerous chemicals that leave byproducts, or an intense amount of energy is required to complete the extraction process.

The most popular methods use chemicals to bond carbon and oxygen atoms in the gas molecules to other compounds in purpose-selected liquids. The CO₂ is introduced via a mixed gas stream of varying degrees and strengths to trap the dioxide molecules in the liquid. Once contained in the solutions, the CO₂ extraction process begins.

The extraction process is the most energy-intensive part of the procedure. Depending on the gas options it can require multiple steps and highly specialized locations. The most common methods of extracting CO₂ from the solvents involve heat, chemical reactions, or electrochemical processes. Additionally, the type of solvent used dictates the intensity and effectiveness of this approach.

Aminebaserade sorbenter

The most popular solution used for carbon capture is Amine-based sorbets. This solution is effective at trapping CO₂ without using a lot of energy. However, the solution is unstable and toxic, resulting in additional risk and storage costs following the process.

Natrium- och kaliumhydroxid

Scientists have also introduced a less toxic approach that utilizes Sodium or potassium hydroxides as the trapping solvent. This strategy provides solid bonds between the CO₂ and solvent atoms. The problem is that the bonds are so strong they require an enormous amount of heat to break, releasing the carbon. As such, this method is expensive and requires a lot of specialty equipment.

Studie av PSE-reaktor för direktluftinfångning

Recognizing the limitations of these technologies and the clear demand for a more sustainable and easier-to-integrate solution. RICE University engineers went to work creating the first room temperature direct air capture device. The team published their findings in Nature Energy¹.

Källa – RICE University