Compiled by the editorial desk with reference to official statements and research publications from MIT.

Researchers at the Massachusetts Institute of Technology have devised a membrane that can convert carbon dioxide emissions from power plants into a usable fuel source, potentially offering a way to mitigate greenhouse gas output while generating a valuable product.

The system, developed by MIT postdoc Xiao-Yu Wu and Ahmed Ghoniem, the Ronald C. Crane Professor of Mechanical Engineering, employs a membrane made from a compound of lanthanum, calcium, and iron oxide. At temperatures reaching 990 degrees Celsius, the membrane allows oxygen from carbon dioxide to pass through, leaving behind carbon monoxide—a gas that can be burned directly as fuel or combined with hydrogen or water to produce liquid hydrocarbons, methanol, or syngas.

According to the researchers, the membrane is 100 percent selective for oxygen, meaning no other gases pass through. The separation process is driven by the high heat, which can be supplied by solar energy or waste heat from the power plant itself. This heat not only powers the reaction but also enables the energy to be stored in chemical form, effectively turning the plant's emissions into a storable fuel.

One challenge in the design is ensuring that the oxygen continues to flow through the membrane to the other side. A vacuum could achieve this, but it would consume substantial energy. Instead, the team proposes using a stream of fuel—such as hydrogen or methane—that readily oxidizes, thereby pulling the oxygen through without the need for a pressure difference.

Potential for Power Plant Integration

The inventors suggest that natural gas power plants could adopt this system to split incoming gas into two streams: one for electricity generation, which produces carbon dioxide, and another that interacts with the membrane to create the oxygen-reacting fuel. This setup would allow the plant to produce syngas—a mixture of carbon monoxide and hydrogen—as a secondary revenue stream, potentially offsetting the system's installation costs.

Beyond fuel, the carbon monoxide can serve as a chemical feedstock for various industrial applications, broadening its utility. The approach is part of a global push toward carbon capture technologies, though this method stands out by offering a direct economic incentive.

Looking ahead, the research team plans to investigate methods to increase the rate of oxygen flow across the membrane. They are also working on integrating the membrane into functional reactors and pairing those reactors with fuel production mechanisms, moving the technology closer to practical deployment.