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Reducing greenhouse gas emissions

By R&D Editors | May 14, 2015

Trapping carbon dioxide (CO2) emissions from power plants and various industries could play a significant role in reducing greenhouse gas emissions in the future. But current materials that can collect CO2—from smokestacks, for example—have low capacities or require very high temperatures to work. Scientists are making progress toward a more efficient alternative, described in 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 F, 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 (two to 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.

Source: American Chemical Society

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