Capturing carbon emissions from power plants and other sources could be key to reducing greenhouse gases.Cgord, Wikimedia CommonsScientists are making progress toward a more efficient alternative, described in the American Chemical Society journal Chemistry of Materials, that could help make carbon capture less energy-intensive.

T. Alan Hatton and colleagues note that although industry and governments are increasingly turning to renewable energy sources such as wind and solar, the world will continue to rely on fossil fuels for the foreseeable future—but at a cost. According to the International Energy Agency, burning fossil fuels emits more than 30 gigatons per year of CO₂, a primary greenhouse gas. Some solid systems that aim to capture these emissions, such as zeolites, are sensitive to water in the gas streams. Others, such as clays and metal oxides, have to be heated up to more than 900 degrees Fahrenheit, which requires a lot of energy. Hatton's team wanted to find a way to cut this latter strategy's energy requirements.

The researchers studied a new class of materials based on magnesium oxide (MgO), which can capture larger quantities of carbon at much lower temperatures than many other substances being investigated. They discovered that coating MgO particles with substances called alkali metal nitrates boosted the amount of CO₂ that material could take up by more than 10-fold. The MgO captures a significantly higher amount of CO₂ (2-10 times) than other systems for a given volume. This translates into smaller equipment needs and lower plant costs.  Additionally, the particles themselves are readily prepared with low-cost materials.

The authors acknowledge funding from Saudi Aramco under the MIT Energy Initiative program.