For the first time, researchers at the USC Loker Hydrocarbon Research Institute have directly converted carbon dioxide from the air into methanol at relatively low temperatures. Prakash, Professor of Chemistry and Director, USC Loker Hydrocarbon Research Institute, commented: “We need to learn to manage carbon. That is the future."
The researchers bubbled air through an aqueous solution of PentaEthyleneHexAmine (or PEHA), adding a catalyst to encourage hydrogen to latch onto the CO2 under pressure. They then heated the solution, converting 79% of the CO2 into methanol. Though mixed with water, the resulting methanol can be easily distilled, Prakash said.
The work, led by G.K. Surya Prakash and George Olah of the USC Dornsife College of Letters, Arts and Sciences, is part of a broader effort to stabilise the amount of carbon dioxide in the atmosphere by using renewable energy to transform the greenhouse gas into its combustible cousin – simultaneously attacking global warming from two angles. Methanol is a clean-burning fuel for internal combustion engines, a fuel for fuel cells and a raw material used to produce many petrochemical products.
Prakash and Olah hope to refine the process to the point that it could be scaled up for industrial use, though that may be 5-10 years away.
“Of course it won’t compete with oil today, at around $30 per barrel,” Prakash said. “But right now we burn fossilised sunshine. We will run out of oil and gas, but the sun will be there for another five billion years. So we need to be better at taking advantage of it as a resource.”
Despite its outsized impact on the environment, the actual concentration of CO2 in the atmosphere is relatively small – roughly 400ppm, or 0.04% of the total volume, according to the National Oceanographic and Atmospheric Administration. (For a comparison, there’s more than 23 times as much the noble gas Argon in the atmosphere – which still makes up less than 1% of the total volume.)
Previous efforts have required a slower multistage process with the use of high temperatures and high concentrations of CO2, meaning that renewable energy sources would not be able to efficiently power the process, as Olah and Prakash hope.
The new system operates at around 125 to 165°C (257 to 359°F), minimising the decomposition of the catalyst – which occurs at 155°C (311°F). It also uses a homogeneous catalyst, making it a quicker 'one-pot' process. In a lab, the researchers demonstrated that they were able to run the process five times with only minimal loss of the effectiveness of the catalyst.
The new process was published in the Journal of the American Chemical Society on 29th December. It can be found here.