Desulfurization (IMAGE) California Institute of Technology Caption The ability to reduce sulfur in fuels is an important step toward reducing emissions. However, extremely low levels can be difficult to achieve. Now, Caltech researchers have demonstrated an unorthodox approach that lowers sulfur content in diesel to about 2 ppm. The method uses Earth-abundant materials (potassium (K), oxygen (O), and silicon (Si) -- hence the name, 'KOSi') and operates under mild conditions. Credit Polina Nesterova Usage Restrictions For use in news stories only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.