How To Make Asphalt Soak Up More Greenhouse Gases by Mike Williams-Rice
A new form of porous asphalt can sequester 154 percent of its weight in carbon dioxide.
The material could offer a cheaper, more efficient way to clean raw natural gas, which typically contains between 2 and 10 percent carbon dioxide and other impurities that must be removed before the gas can be sold.
The current cleanup process is complicated and expensive and most often involves flowing the gas through fluids called amines that can soak up and remove about 15 percent of their own weight in carbon dioxide. The amine process also requires a great deal of energy to recycle the fluids for further use.
“It’s a big energy sink,” says Rice University chemist James Tour, whose lab developed a technique last year to turn asphalt into a tough, sponge-like substance that could be used in place of amines to remove carbon dioxide from natural gas as it was pumped from ocean wellheads.
Initial field tests in 2015 found that pressure at the wellhead made it possible for that asphalt material to adsorb, or soak up, 114 percent of its weight in carbon at ambient temperatures.
Tour says the new, improved asphalt sorbent is made in two steps from a less expensive form of asphalt, which makes it more practical for industry.
“This shows we can take the least expensive form of asphalt and make it into this very high surface area material to capture carbon dioxide,” Tour adds. “Before, we could only use a very expensive form of asphalt that was not readily available.”
What test results show
The lab heated a common type asphalt known as Gilsonite at ambient pressure to eliminate unneeded organic molecules, and then heated it again in the presence of potassium hydroxide for about 20 minutes to synthesize oxygen-enhanced porous carbon with a surface area of 4,200 square meters per gram, much higher than that of the previous material.
The Rice lab’s initial asphalt-based porous carbon collected carbon dioxide from gas streams under pressure at the wellhead and released it when the pressure was released. The carbon dioxide could then be repurposed or pumped back underground while the porous carbon could be reused immediately.
In the latest tests with its new material, Tours group showed its new sorbent could remove carbon dioxide at 54 bar pressure. One bar is roughly equal to atmospheric pressure at sea level, and the 54 bar measure in the latest experiments is characteristic of the pressure levels typically found at natural gas wellheads, Tour says.
Source: Rice University
Original Study DOI: 10.1002/aenm.201600693