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Cu-zeolites are catalysts that are often used in automotive emissions control systems. Although they are stable and function at low temperatures, they have been known to form unwanted N2O emissions during selective catalytic reduction* (SCR),
The mechanism of how this occurs is not well understood but may be due to the difference in copper concentrations in the catalyst. In order to confirm this theory, scientists at Finden used two different samples of CU-SSZ-13 catalysts prepared by two different methods.
They used XANES and XRF spectroscopy at Diamond, along with UV-Vis and Raman spectroscopy techniques, to characterise the nature of copper species in each sample. IT microspectroscopy was then used to compare the behaviour of each sample during SCR under operando conditions, to monitor the mechanism by which N2O is formed.
Find out what they discovered.
* the process of converting nitrogen oxide into less polluting nitrogen and water.
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