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Monday
Mar162009

CO2-eating cement named top clean technology

Wired magazine’s top clean technology of 2008 wasn’t nano, bio or info – it was cement:

Cement? With all the whiz bang technologies in green technology, cement seems like an odd pick for our top clean technology of the year. But here's the reason: making cement — and many other materials — takes a lot of heat and that heat comes from fossil fuels.

Calera's technology, like that of many green chemistry companies, works more like Jell-O setting. By employing catalysis instead of heat, it reduces the energy cost per ton of cement. And in this process, CO2 is an input, not an output. So, instead of producing a ton of carbon dioxide per ton of cement made — as is the case with old-school Portland cement — half a ton of carbon dioxide can be sequestered.

With more than 2.3 billion tons of cement produced each year, reversing the carbon-balance of the world's cement would be a solution that's the scale of the world's climate change problem. In August, the company opened its first demonstration site next to Dynegy's Moss Landing power plant in California.

For more background on Calera’s technology, check out the article at Scientific American.

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