Sentences with phrase «active metal atoms»
The lifetime of catalysts that convert automotive exhaust pollutants can be increased by lowering their operating temperature, which helps to prevent deactivation caused by the active metal atoms agglomerating into larger, less active particles.
http://science.sciencemag.org/ Not exact matches
The distribution of nitrogen atoms after the dissociation allowed the identification of the «active sites» for this reaction, which are formed by the low - coordinated, top metal atoms of atomic steps.
In the early 2000s, Maria's group had pioneered the single - atom approach for metals anchored on oxide supports as the exclusive active sites for the water - gas shift reaction to upgrade hydrogen streams for fuel cell use.
Recently, a team from Pacific Northwest National Laboratory determined that the key difference between small and large metal particles was their ability to provide active hydrogen atoms.
Digging further, they found that the larger particles provided abundant highly active atomic hydrogen atoms, so the key difference between small and large metal particles was their ability to provide hydrogen.