A major greenhouse gas, CO2 produced from burning fossil fuels is still mostly released into the atmosphere, adding to the burden of global warming.
One way to cut down on it is through a carbon capture: a chemical technique that removes CO2 out of emissions (“postcombustion”), preventing it from entering the atmosphere. The captured CO2 can then be either recycled or stored away in in gas or liquid form, a process known as sequestration.
Carbon capture can be done using so-called “high-performance membranes”, which are polymer filters that can specifically pick out CO2 from a mix of gases, such as those coming out of a factory’s flue. These membranes are environmentally-friendly, they don’t generate waste, they can intensify chemical processes, and can be used in a decentralized fashion. In fact, they are now considered as one of the most energy-efficient routes for reducing CO2 emissions.
Scientists led by Kumar Varoon Agrawal at EPFL Valais Wallis have now developed a new class of high-performance membranes that exceeds post-combustion capture targets by a significant margin. The membranes are based on single-layer-graphene with a selective layer thinner than 20 nm and are highly tunable in terms of chemistry, meaning that that can pave the way for next-generation high-performance membranes for several critical separations.
Current membranes are required to exceed 1000 gas permeation units (GPUs), and have a “CO2/N2 separation factor” above 20 – a measure of their carbon-capturing specificity. The membranes that the EPFL scientists developed show six-fold higher CO2 permeance at 6,180 GPUs with a separation factor of 22.5. The GPUs shot up to 11,790 when the scientists combined optimized graphene porosity, pore size, and functional groups (the chemical groups that actually react with CO2), while other membranes they made showed separation factors up to 57.2.
“Functionalizing CO2-selective polymeric chains on nanoporous graphene allows us to fabricate nanometer-thick yet CO2-selective membranes,” says Agrawal. “This two-dimensional nature of the membrane drastically increases the CO2permeance, making membranes even more attractive for carbon capture. The concept is highly generic, and a number of high-performance gas separations are possible in this way.”
Learn more: Next-gen membranes for carbon capture
The Latest on: Carbon capture
via Google News
The Latest on: Carbon capture
- DNV GL, TCM and SINTEF join forces in major international carbon capture and storage partnershipon October 7, 2020 at 12:15 pm
Three international organizations specializing in technology research, testing, advisory services, and standardization have joined forces to find new ways to accelerate the adoption of carbon capture, ...
- Non-profit group plans to grow forest near Edmonton as a natural carbon captureon October 7, 2020 at 9:32 am
An Edmonton non-profit is planning to grow a carbon-capturing forest east of the city in partnership with a Calgary-based company and conservation groups. Project Forest, an initiative aiming to ...
- Carbon capture 'moonshot' moves closer, as billions of dollars pour inon October 7, 2020 at 1:19 am
While some say CO2 capture is part of the problem, billions of dollars are being invested in it as a part solution to the climate crisis ...
- Carbon capture technology for N.M. power plant wins more supporton October 6, 2020 at 2:13 pm
Local leadership and businesses are continuing to garner support as they negotiate plans to modify New Mexico’s San Juan Generating Station ...
- US DOE supports carbon captureon October 5, 2020 at 9:14 pm
Menezes visited Albuquerque on Monday, where he held two roundtable discussions with local industry leaders and some state legislators on the importance of the oil and gas industry in New Mexico, and ...
- New report highlights economic benefits of carbon capture retrofit of San Juan power planton October 5, 2020 at 7:59 pm
An independent report commissioned by the U.S. Department of Energy states that the Farmington area will benefit from a carbon capture project.
- Officials: Carbon capture project would be largest in worldon October 5, 2020 at 5:40 pm
One of the largest coal-fired power plants in the U.S. Southwest would undergo a $1.4 billion overhaul as part of a proposal to keep the plant operating for at least another decade while meeting ...
- US DOE throws its support behind San Juan carbon capture planon October 5, 2020 at 5:25 pm
Menezes said efforts to convert the coal-fired San Juan Generating Station near Farmington into the world’s largest carbon-capture facility could make New Mexico a national and international leader ...
- Lego-like assembly of zeolitic membranes improves carbon captureon October 5, 2020 at 12:48 pm
Zeolites are porous minerals that occur both naturally but also are being synthesized artificially. Because they are stable and durable, zeolites are used for chemical catalysis, purification of gases ...
- Carbon capture to play greater role in oil and gas as ‘peak demand’ timeline moves up: reporton September 23, 2020 at 4:59 pm
Carbon capture and storage projects must play a greater role in fossil fuel emissions reductions from offshore oil platforms to onshore natural gas processing plants in order to meet net-zero ...
via Bing News