New mechanism converts natural gas to energy faster, captures CO2

New mechanism converts natural gas to energy faster, captures CO2

(Phys.org) —North Carolina State University researchers have identified a new mechanism to convert natural gas into energy up to 70 times faster, while effectively capturing the greenhouse gas carbon dioxide (CO2).

"This could make power generation from natural gas both cleaner and more efficient," says Fanxing Li, co-author of a paper on the research and an assistant professor of chemical and biomolecular engineering at NC State.

At issue is a process called chemical looping, in which a solid, oxygen-laden material – called an "oxygen carrier" – is put in contact with natural gas. The oxygen atoms in the oxygen carrier interact with the natural gas, causing combustion that produces energy.

Previous state-of-the-art oxygen carriers were made from a composite of inert and . But Li's team has developed a new type of oxygen carrier that include a "mixed ionic-electronic conductor," which effectively shuttles into the natural gas very efficiently – making the chemical looping combustion process as much as 70 times faster. This mixed conductor material is held in a nanoscale matrix with an – otherwise known as rust. The rust serves as a source of oxygen for the mixed conductor to shuttle out into the natural gas.

New mechanism converts natural gas to energy faster, captures CO2
NC State University researchers have developed a new type of oxygen carrier that include a "mixed ionic-electronic conductor," which effectively shuttles oxygen atoms into natural gas very efficiently -- making the chemical looping combustion process as much as 70 times faster. Credit: Fanxing Li, North Carolina State University

In addition to energy, the combustion process produces and CO2. By condensing out the water vapor, researchers are able to create a stream of concentrated CO2 to be capture for sequestration.

Because the new oxygen carrier combusts natural gas so much more quickly than previous chemical looping technologies, it makes smaller chemical looping reactors more economically feasible – since they would allow users to create the same amount of energy with a smaller system.

"Improving this process hopefully moves us closer to commercial applications that use chemical looping, which would help us limit ," Li says.


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A milestone for new carbon-dioxide capture/clean coal technology

More information: The paper, "Iron Oxide with Facilitated O2 – Transport for Facile Fuel Oxidation and CO2 Capture in a Chemical Looping Scheme," was chosen as part of the cover page story in the March issue of ACS Sustainable Chemistry & Engineering. pubs.acs.org/doi/abs/10.1021/sc300177j
Citation: New mechanism converts natural gas to energy faster, captures CO2 (2013, May 7) retrieved 27 February 2020 from https://phys.org/news/2013-05-mechanism-natural-gas-energy-faster.html
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