AI Article Synopsis
- Raman spectroscopy is a key nondestructive method for studying heterogeneous catalysts, but its use on millimeter-sized catalyst bodies is limited due to issues like large fluorescence signals and scattering.
- Different techniques have been explored to tackle these challenges, including time-resolved Raman spectroscopy (TRRS), spatially offset Raman spectroscopy (SORS), and surface-enhanced Raman spectroscopy (SERS).
- The paper highlights that TRRS is particularly effective in providing chemical information deep within catalyst bodies, reducing interference from fluorescence and enabling the study of localized activity through time-resolved SERS, thus enhancing the prospects for industrial catalysis research.
Article Abstract
Raman spectroscopy is one of the major characterization methods employed over the last few decades as a nondestructive technique for the study of heterogeneous catalysts and related catalytic reactions. However, the promise of practical applicability on millimeter-sized catalyst bodies, such as extrudates, has not been fulfilled completely. Large fluorescence signals and the highly scattering nature of the extrudates often hamper its practical usage. Different approaches to overcome this problem were examined, including the use of time-resolved Raman spectroscopy (TRRS), spatially offset Raman spectroscopy (SORS), surface-enhanced Raman spectroscopy (SERS), and combinations of these techniques. This paper demonstrates that especially TRRS can provide chemical information at depth within catalyst bodies, overcoming fluorescence background signals and allowing for visualization of analytes at different depths. It also examines the application of time-resolved SERS within catalyst bodies to gain insight into localized activity. With these options a wider applicability of Raman spectroscopy for industrial catalysis research becomes within reach.
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| http://dx.doi.org/10.1366/12-06698 | DOI Listing |
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