AI Article Synopsis
- Single-atom catalysts like Rh/AlO perform well due to low metal loading, but face challenges with isolated atoms clumping together during preparation or high-temperature reactions.* -
- This study demonstrates that the process of dissolving and re-extracting metal atoms from the support can prevent deactivation during methane reforming at temperatures of 700-900 °C.* -
- The research reveals that as rhodium atoms move to the surface over time, the catalyst's performance improves, despite changes in the oxidation state of rhodium, emphasizing the importance of atom migration in enhancing catalyst effectiveness.*
Article Abstract
Single-atom catalysts often show exceptionally high performance per metal loading. However, the isolated atom sites tend to agglomerate during preparation and/or high-temperature reaction. Here we show that in the case of Rh/AlO this deactivation can be prevented by dissolution/exsolution of metal atoms into/from the support. We design and synthesise a series of single-atom catalysts, characterise them and study the impact of exsolution in the dry reforming of methane at 700-900 °C. The catalysts' performance increases with increasing reaction time, as the rhodium atoms migrate from the subsurface to the surface. Although the oxidation state of rhodium changes from Rh(iii) to Rh(ii) or Rh(0) during catalysis, atom migration is the main factor affecting catalyst performance. The implications of these results for preparing real-life catalysts are discussed.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10069472 | PMC |
| http://dx.doi.org/10.1039/d2cy02126a | DOI Listing |
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