Scientists at the University of California, Los Angeles have synthesized a class of spongelike crystals that can soak up carbon dioxide, the primary greenhouse gas in industrial emissions.

The crystals - zeolitic imidazolate frameworks, or ZIFs - are grids of metal atoms and organic molecules that loosely trap carbon dioxide as it drifts into microscopic pores. The researchers believe that atomic charges hold the gas in place.


One variety, ZIF-69, is so absorbent that a single liter of it can hold 83 liters of carbon dioxide, according to a study published yesterday in the journal Science.

The crystals could be tailored to capture carbon dioxide emissions from coal-fired power plants, factories and other industrial sources, said Omar M. Yaghi, the chemist from UCLA who led the study.

The idea is to line the insides of smokestacks with a layer of ZIF. Carbon dioxide that enters the pores could be sucked out periodically and sequestered underground.

Yaghi said the material also could be used to line vehicle exhaust systems. (LAT)