Chemistry 2011.org
Chemistry2011.org
All About Chemistry... 2011 and beyond
Gasoline

Related Stories

Process holds promise for production of synthetic gasoline from carbon dioxide

Dec. 2, 2013 — A chemical system developed by researchers at the University of Illinois at Chicago can efficiently perform the first step in the process of creating syngas, gasoline and other energy-rich products out of carbon dioxide.

A novel "co-catalyst" system using inexpensive, easy to fabricate carbon-based nanofiber materials efficiently converts carbon dioxide to carbon monoxide, a useful starting-material for synthesizing fuels. The findings have been published online in advance of print in the journal Nature Communications.

"I believe this can open a new field for the design of inexpensive and efficient catalytic systems for the many researchers already working with these easily manipulated advanced carbon materials," says Amin Salehi-Khojin, UIC professor of mechanical and industrial engineering and principal investigator on the study.

Researchers have spent decades trying to find an efficient, commercially viable way to chemically "reduce," or lower the oxidation state, of carbon dioxide. The UIC researchers approached the problem in a new way.

Although reducing carbon dioxide is a two-step process, chemists had commonly used a single catalyst, Salehi-Khojin said. He and his colleagues experimented with using different catalysts for each step.

In previous work, Salehi-Khojin used an ionic liquid to catalyze the first step of the reaction, and silver for the final reduction to carbon monoxide. The co-catalyst system was more efficient than single-catalyst carbon dioxide reduction systems, he said.

But silver is expensive. So he and his coworkers set out to see if a relatively new class of metal-free catalysts -- graphitic carbon structures doped with other reactive atoms -- might work in place of the silver.

They tried a common structural material, carbon nanofibers, which was doped with nitrogen, as a substitute for silver to catalyze the second step.

When these carbon materials are used as catalysts, the doping atoms, most often nitrogen, drive the reduction reaction. But, through careful study of this particular reaction, the researchers found that it was not the nitrogen that was the catalyst.

"It was the carbon atom sitting next to the dopant that was responsible," said Mohammad Asadi, a UIC graduate student who is one of two first-authors of the study.

"We were very surprised at first," Asadi said.

But as they continued to characterize the reaction it became clear not only that carbon was catalyzing the reaction, but that the co-catalyst system was more efficient than silver, "showing substantial synergistic effects," Asadi said.

Bijandra Kumar, UIC research scholar and the other first-author of the paper, said the team "uncovered the hidden mechanism" of the co-catalyzed reaction, which has "opened up a lot of options for designing inexpensive and efficient catalyst system for carbon dioxide conversion."

"Further, one can imagine that using atomically-thin, two-dimensional graphene nano-sheets, which have extremely high surface area and can easily be designed with dopant atoms like nitrogen, we can develop even far more efficient catalyst systems," Kumar said.

"If the reaction happened on the dopant, we would not have much freedom in terms of structure," said Salehi-Khojin. In that case, little could be done to increase the efficiency or stability of the reaction.

But with the reaction happening on the carbon, "we have enormous freedom" to use these very advanced carbon materials to optimize the reaction, he said.

The researchers hope that their research leads to commercially viable processes for the production of syngas and even gasoline from carbon dioxide.

Co-authors are Davide Pisasale, Suman Sinha-Ray, Jeremiah Abiade and Alexander Yarin from UIC and Brian Rosen and Richard Haasch from the University of Illinois at Urbana-Champaign.

The study was supported in part by UIC. The work was carried out in part at the Frederick Seitz Materials Research Laboratory at the Urbana-Champaign campus.

Share this story with your friends!

Social Networking

Please recommend us on Facebook, Twitter and more:

Other social media tools

Global Partners
Feedback

Tell us what you think of Chemistry 2011 -- we welcome both positive and negative comments. Have any problems using the site? Questions?

About us

Chemistry2011 is an informational resource for students, educators and the self-taught in the field of chemistry. We offer resources such as course materials, chemistry department listings, activities, events, projects and more along with current news releases.

Events & Activities

Are you interested in listing an event or sharing an activity or idea? Perhaps you are coordinating an event and are in need of additional resources? Within our site you will find a variety of activities and projects your peers have previously submitted or which have been freely shared through creative commons licenses. Here are some highlights: Featured Idea 1, Featured Idea 2.

About you

Ready to get involved? The first step is to sign up by following the link: Join Here. Also don’t forget to fill out your profile including any professional designations.

Global Partners