Scientists improve method capture CO2 from natural gas

Scientists improve method to capture CO2 from natural gas

9:17 AM, 16th September 2016
Scientists improve method to capture CO2 from natural gas
Rice University scientists have improved their asphalt-derived porous carbon’s ability to capture carbon dioxide, a greenhouse gas, from natural gas. The capture material derived from untreated Gilsonite asphalt has a surface area of 4,200 square meters per gram.

HOUSTON, US: A Rice University laboratory has improved its method to turn plain asphalt into a porous material that can capture greenhouse gasses from natural gas.

In research detailed in the journal Advanced Energy Materials, Rice researchers showed that a new form of the material can sequester 154 percent of its weight in carbon dioxide (CO2) at high pressures that are common at gas wellheads.

Raw natural gas typically contains between 2 and 10 percent carbon dioxide and other impurities, which must be removed before the gas can be sold. The 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,” said Rice 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 said 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 said. “Before, we could only use a very expensive form of asphalt that was not readily available.”

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 said.

Rice postdoctoral researcher Almaz Jalilov is lead author of the study. Co-authors are Rice graduate student Yilun Li and former Rice research scientist Jian Tian, now at Wuhan University, China.

The Apache Corp, Prince Energy and MI-SWACO supported the research.

© Rice University News



Your Comments (Up to 2000 characters)
Please respect our community and the integrity of its participants. WOC reserves the right to moderate and approve your comment.

Related News

Breakthrough in proton diffusion could lead to better fuel cell technologies

LIVERPOOL, UK: Scientists at the University of Liverpool have made an important breakthrough which could lead to the design of better fuel cell materi ...

Read more
Water helps gathering of biofibres that could capture sunlight

LEMONT, US: When it comes to water, some materials have a split personality – and some of these materials could hold the key to new ways of harn ...

Read more
TerraVia’s whole algae used as a top plant-based protein in grocery store

SAN FRANCISCO, US: TerraVia said that its AlgaVia Protein-Rich Whole Algae continues to gain traction among leading food manufacturers and pioneering ...

Read more
Shell to sell its Denmark refining business in $80 mn deal

THE HAGUE, NETHERLANDS: Royal Dutch Shell plc has reached an agreement with Dansk Olieselskab ApS for the sale of A/S Dansk Shell in Denmark, which co ...

Read more
ExxonMobil, Princeton University partner for new energy research projects

IRVING, US: ExxonMobil Corporation and Princeton University have selected five research projects associated with their partnership, focused on energy ...

Read more
BASF to acquire Henkel’s flooring, tiling and waterproofing business

LUDWIGSHAFEN/DUSSELDORF, GERMANY: BASF SE and Henkel AG have signed an agreement under which BASF intends (plans) to acquire Henkel’s profession ...

Read more uses cookies to ensure that we give you the best experience on our website. By using this site, you agree to our Privacy Policy and our Terms of Use. X