A Perspective on Counting Catalytic Active Sites and Rates of Reaction Using X-Ray Spectroscopy
| Autor: | J. A. van Bokhoven, Simon A. Kondrat |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Reaction mechanism
X-ray spectroscopy biology 010405 organic chemistry Chemistry Active site General Chemistry 010402 general chemistry 01 natural sciences Catalysis 0104 chemical sciences Characterization (materials science) Reaction rate Catalytic cycle Chemical physics biology.protein Spectroscopy |
| Zdroj: | Topics in Catalysis. 62:1218-1227 |
| ISSN: | 1572-9028 1022-5528 |
| DOI: | 10.1007/s11244-018-1057-4 |
| Popis: | Identification of active sites and phases in heterogeneous catalysts and the understanding of the reaction mechanism remain highly challenging. In most catalysts, the existence of a multitude of surface species, which are dynamic in relation to reaction conditions, presents a challenge of distinguishing those that are involved in the catalytic cycle from those which are spectators. The emergence of the field of single-site catalysts potentially eliminates these issues, although it can be argued that these systems remain dynamic and that multiple speciation, each a candidate for the active site, often remains a consideration. A perspective on how X-ray spectroscopy and characterization tools in general, can be used to correlate the number of active sites and the rate of their formation, in single-site and redox catalyst systems, is presented. The importance of observing proportionality between spectra features and the reaction rate, to differentiate between active sites and spectator species is discussed. Performing characterisation under catalyticly relevant conditions on structures that are demonstrably representative of actual catalysts is essential. |
| Databáze: | OpenAIRE |
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