A new efficient catalyst that converts carbon dioxide into synthetic natural gas in a ‘clean’ process using solar energy could pave the way for carbon neutral fuel, Australian scientists say.
The research – a collaboration by the University of Adelaide and CSIRO – could make viable a process that has enormous potential to replace fossil fuels and continue to use existing carbon-based fuel technologies without increasing atmospheric carbon dioxide (CO2).
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 Renata Lippi.
“But for this to be economically viable, we need an energy efficient process that utilises CO2 as a carbon source.”
She says research has shown that the hydrogen can be produced efficiently with solar energy.
But combining the 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,” Ms Lippi says.
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.
The 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.
Importantly, 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.
“What we’ve produced is a highly active, highly selective … and stable catalyst that will run on solar energy,” says project leader Professor Christian Doonan, Director of the University’s Centre for Advanced Nanomaterials.
“This makes carbon neutral fuel from CO2 a viable option,” he says.
Read more about this exciting research here. Story credit: University of Adelaide newsroom.
Research to advance clean energy technology is only possible if we support our universities. To keep Australia clever, please sign the petition below.