Startup turns carbon dioxide into fuels - 0 views
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The research has received funding from the Air Force Office of Scientific Research (AFSOR), the National Science Foundation and the Department of Energy (DOE). The collaboration between Liquid Light and the University was supported by the DOE Small Business Innovation Research program and the AFOSR Small Business Technology Transfer program. Princeton's agreement with Liquid Light allowed the company to continue to collaborate with Bocarsly and his research team. Before long, new discoveries were emerging. "They started noticing interesting chemistry that we wouldn't have predicted," said Bocarsly.
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The Princeton scientists did some additional studies, and made a surprising discovery: They could turn CO2, which contains only one carbon, into a compound with a carbon-carbon bond, which vastly increases the possibilities for creating commercial applications. This was radical because although the reaction is certainly possible, it is highly unlikely to happen because so many other competing reactions are occurring. "Everyone who electrochemically reduces CO2 today makes compounds with only one carbon," said Bocarsly. "Nobody makes things with carbon-carbon bonds." He paused. "But we can." "That was a very 'wow' moment," recalled Cole, "because we thought that our process could only make methanol. But now we were finding that we could make a variety of products, and that is what makes this technology commercially interesting." She said Liquid Light scientists can now make more than 20 different products from CO2.
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One of the chemicals Liquid Light can make is isopropanol, commonly known as rubbing alcohol and an important industrial chemical. Another is butanol, which could be commercially important as a fuel. Liquid Light's technology offers the potential to make these chemicals at lower cost than today's methods, which involve starting with fossil fuels such as petroleum and natural gas.
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Why does pyridinium work so well as a catalyst for the reaction? Based on its structure, the ring-shaped molecule is an unlikely catalyst for this reaction because it shuttles just one electron at a time. But to convert CO2 to methanol requires six electrons, and to make higher-carbon molecules takes even more electrons. Bocarsly and his team — in collaboration with Steven Bernasek, professor of chemistry — are doing studies to understand the steps in the chemical reaction, and they are making rapid progress. "There are clearly some intermediate products formed during the reaction that do not sit around for a long time and are not there in very high concentrations," said Bocarsly.
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The Princeton team also is studying the factors that determine which products can be made from CO2. The researchers have found that very subtle changes in the electrode surface can lead to production of different chemicals. For example, CO2 plus a pyridinium catalyst and a platinum electrode make methanol. However, the same catalyst and a different electrode give a different product. The team published its findings on how the reaction is affected by catalyst concentration, temperature and pressure in the journal ChemSusChem last year.
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Citing government statistics that the United States generates about 5.5 billion metric tons of CO2 per year, Teamey said it will not be hard to obtain the starting materials for this new industry. However, the CO2 needs to be relatively pure, a requirement that rules out gasoline tailpipes and coal-fired power plants. Instead, said Teamey, the CO2 could come from manufacturing facilities, such as fertilizer manufacturers and cement plants, which according to Teamey emit some 100 million tons of high-purity CO2 each year.
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"Today, carbon dioxide (CO2) is a hot topic. Scientists around the globe are searching for ways to store, dispose of, or prevent the formation of the greenhouse gas, which is a major driver of global climate change. Liquid Light hopes to take this concept one step further and harness waste CO2 as a source of carbon to make industrial chemicals and fuels. The technology behind the process is simple: Take CO2 and mix it in a water-filled chamber with an electrode and a catalyst. The ensuing chemical reaction converts CO2 into a new molecule, methanol, which can be used as a fuel, an industrial solvent or a starting material for the manufacture of other chemicals. Liquid Light's founders include Bocarsly and his former graduate student Emily Cole, who earned her Ph.D. from Princeton in 2009. Cole helped revive efforts in Bocarsly's lab to study the conversion of CO2 into usable fuels, which led to the launch of Liquid Light and an ongoing collaboration that Bocarsly said has been extremely positive for his research team at the University. "We've made some discoveries that wouldn't have been made in a university setting, and this has really accelerated the research," Bocarsly said. "It is a very productive relationship." Back in the 1990s, a former Ph.D. student of Bocarsly's named Chao Lin conducted some of the earliest experiments on turning CO2 into methanol. He used palladium metal as the electrode and pyridinium, an inexpensive ring-shaped molecule, as the catalyst. By plugging the electrode into an electrical outlet, he could drive an electrochemical reaction that converted CO2 into methanol. As Bocarsly recalled, Lin was quite excited about his success. However, said Bocarsly, "We published that finding in 1994 and there was approximately zero interest in it." The work languished until 2005 when Cole, then a new graduate student, told Bocarsly she wanted to work on a clean-energy project. She took up the challenge of reproducing Lin's results, but this time