Owners of wood burners, stoves and open fires will no longer be able to buy coal or wet wood to burn in them, under a ban to be rolled out from next year. Sales of the two most polluting fuels will be phased out in England to help cut air pollution, the government says. Bags […]
Millions of tonnes of carbon dioxide could be prevented from entering the atmosphere following the discovery of a way to turn coal, grass or municipal waste more efficiently into clean fuels.
Scientists have adapted a process called “gasification” which is already used to clean up dirty materials before they are used to generate electricity or to make renewable fuels. The technique involves heating organic matter to produce a mixture of hydrogen and carbon monoxide, called syngas.
However gasification is very energy-intensive, requiring high-temperature air, steam or oxygen to react with the organic material. Heating this up leads to the release of large amounts of carbon dioxide. In addition, gasification is often inefficient, leaving behind significant amounts of solid waste at the end of the process.
To find out how to make the process more efficient, researchers led by Marco Castaldi, at the department of earth and environmental engineering at Columbia University, tried varying the atmosphere in the gasifier. They found that, by adding CO2 into the steam atmosphere of a gasifier, significantly more of the biomass or coal was turned into useful syngas.