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University of Adelaide scientists have created a new efficient catalyst that converts CO2 from air into synthetic natural gas.

The new development which was conducted in collaboration with CSIRO, could pave the way for carbon neutral fuel.

The catalyst the researchers have developed effectively drives the process of combining CO2 with hydrogen to produce methane (the main component of the fossil fuel natural gas) and water. Currently, natural gas is one of the main fuels used for industrial activities.

“Capturing carbon from the air and utilising it for industrial processes is one strategy for controlling CO2 emissions and reducing the need for fossil fuels,” says University of Adelaide PhD candidate and first author Renata Lippi. “But for this to be economically viable, we need an energy efficient process that utilises CO2 as a carbon source.”

According to the researchers, combining hydrogen with CO2 to produce methane is a safer option than using hydrogen directly as an energy source and allows the use of existing natural gas infrastructure.

“The main sticking point, however, is the catalyst – a compound needed to drive the reaction because CO2 is usually a very inert or unreactive chemical,” says Lippi.

The catalyst was synthesised using porous crystals called metal-organic frameworks which allow precise spatial control of the chemical elements.

“The catalyst discovery process involved the synthesis and screening of more than one hundred materials. With the help of CSIRO’s rapid catalyst testing facility we were able to test all of them quickly allowing the discovery to be made in a much shorter period of time,” said Dr Danielle Kennedy, AIM Future Science Platform Director with CSIRO. “We hope to continue collaborating with the University of Adelaide to allow renewable energy and hydrogen to be applied to chemical manufacturing by Australian industry.”

With other catalysts there have been issues around poor CO2 conversion, unwanted carbon-monoxide production, catalyst stability, low methane production rates and high reaction temperatures.

This new catalyst efficiently produces almost pure methane from CO2. Carbon-monoxide production has been minimised and stability is high under both continuous reaction for several days and after shutdown and exposure to air.

According to the researchers, only a small amount of the catalyst is needed for high production of methane which increases economic viability.

The catalyst also operates at mild temperatures and low pressures, making solar thermal energy possible.

Image credits and content: Sunfire Dresden-Flickr/University of Adelaide

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