http://www.stuff.co.nz/dominion-post/national/2946227/Scientists-real-eureka-moment
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Kiwi scientists have made a breakthrough in which lime would be used to capture carbon emissions from coal-fired power stations.
The process, developed by Industrial Research, uses limestone, a common material.
The commercial benefits of the new process are potentially huge, with countries such as India and China rapidly building new coal-fired power plants.
"It was a real eureka moment. It was the last piece of the jigsaw to make it a practical system," Industrial Research scientist Robert Holt said. "[It is] very well-known chemistry. It's been done for thousands of years."
When limestone is heated to 900 degrees celsius, it loses its carbon dioxide and becomes lime. When lime cools it absorbs carbon dioxide from the air. Until now lime has not been used to capture carbon emissions on a commercial scale, because the process makes it break down too quickly.
However, the Industrial Research team of chemists and chemical engineers has worked out a way to "reactivate" the lime, meaning it can be used up to 100 times before it degrades.
Exposing the lime to steam reopened its pore structures and enabled CO2 to be rapidly absorbed again, Mr Holt said.
"What it does is it makes the lime effective again, but the big breakthrough was discovering a way of thermally treating the lime, after it was hydrated, so we could maintain its structural integrity. It's almost like curing it."
Up to to 85 per cent of carbon emissions could be soaked up by the lime-based process.
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