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Tracking Signs of Better Catalysts
Tevatron to Shut Down at End of FY2011
Tuesday - January 11, 2011 |
Tracking Signs of Better CatalystsSLAC researchers have taken a big step toward making useful catalysts easier to find or create—processes that have previously relied on trial and error. As explained yesterday in the Proceedings of the National Academy of Sciences, SLAC researchers at the Center for Sustainable Energy through Catalysis, or SUNCAT, are using advances in surface chemistry research to better describe the intrinsically complex process of catalysis, a type of chemical reaction that occurs at the surfaces of materials. In catalysis, a chemical called a catalyst helps speed chemical reactions between other molecules, without itself being changed. Catalysis is the basis for most important industrial chemical processes, used for years in everything from refining oil to producing plastic or fertilizers. It is also the basis for some of the crucial processes needed to turn sunlight into fuels and other chemicals. However, the theory to explain just why certain substances make chemical reactions happen faster or more efficiently—and, more importantly, to predict even better catalysts—has lagged behind experimental efforts. The researchers at SUNCAT want to use an approach called density functional theory to change that. "[The paper] is really almost a program for the theory portion of catalysis research at SLAC and Stanford," said Jens Nørskov, director of SUNCAT and the paper's lead author. The paper does not shy away from the challenges such research still faces, he added, "but it illustrates where our methods can help." The methods of density functional theory involve identifying important trends for classes of catalysts and chemical reactions; those trends can then be used to predict new and better catalysts. In this approach, the electrons that are key to forming and dissolving chemical bonds are treated as interacting clouds of varying densities, and a descriptor, or more general way to describe their behavior, is developed. Thus far, density functional theory has been applied successfully for an important class of catalysts called transition metals. Read more... Tevatron to Shut Down at End of FY2011Fermilab Today published the following message from Director Pier Oddone in a special edition today:
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