April 25, 2013
Speeding The Search For A Better Way To Capture Methane
Lawrence Berkeley National Laboratory
Like the Roman god Janus, methane presents Earth´s atmosphere with two situational faces. As the main component of natural gas, methane when burned as a fuel produces less carbon dioxide than the burning of oil or coal, which makes it a plus for global climate change. However, pure methane released into the atmosphere via leaks from unconventional oil and gas extraction, coal mining or from the melting of Arctic ice is an even more potent greenhouse gas than carbon dioxide, contributing an estimated 30-percent of current net climate warming. To exploit the good and blunt the bad, effective ways of separating and capturing methane must be found. This presents a huge challenge, however, as methane, unlike carbon, interacts poorly with most other materials, making it difficult to physically capture.
“Our computational approach lets us screen hundreds of thousands of candidate structures within days, thus enabling the discovery of novel structures that can serve as the building blocks of real, practical technology,” says Smit, who directs UC Berkeley´s Energy Frontier Research Center. “These screening studies show that nanoporous materials with the right geometric constraints are able to enrich the methane concentration of low quality natural gas and coal-mine ventilation air. The next step is to see whether these in-silico studies can be used to guide the synthesis of these materials.”
The most promising of the zeolite candidates was “SBN,” which has a large number of binding sites that are formed in such a way as to maximize its interactions with methane. This results in what Smit and his colleagues characterize as an “extraordinarily high performance” for concentrating methane from a medium-concentration source to a high concentration. For treating coal-mine ventilation air, in which the methane streams are dilute, the best zeolites were those that feature one-dimensional channels with a diameter that is optimal for methane molecules. Zeolites ZON and FER were identified as prime candidates for this purpose.
Working with Smit on this project were Jihan Kim and Li-Chiang Lin, of Berkeley Lab, and Roger Aines, Amitesh Maiti and Joshuah Stolaroff of LLNL.
A paper describing this work has been published in Nature Communications.
On The Net: