AI Article Synopsis
- - This study developed metal-modified rod-like ceria catalysts using a hydrothermal method, which effectively removed carbonyl sulfide (COS) at low temperatures.
- - The research identified that the presence of surface oxygen vacancies and basic sites are crucial for enhancing the catalytic performance during COS hydrolysis.
- - Among the tested catalysts, 10La-CeO was the most effective, as the La doping improved oxygen vacancies and basicity, facilitating better COS adsorption and decomposition into simpler products.
Article Abstract
This study utilized a hydrothermal method to synthesize various metal-modified rod-like ceria catalysts (Fe, Co, Cu, Ni, La), achieving efficient COS removal at low temperatures. The research identified surface oxygen vacancies and basic sites as critical factors that influence the catalytic performance of COS hydrolysis. The addition of different metals to pristine ceria rods increased the specific surface area, oxygen vacancy content (Ov), and basicity, which enhanced the catalysts' sulfur resistance and stability. Among all the catalysts tested, 10La-CeO demonstrated the highest COS removal rate. This is because La doping significantly augmented Ov, providing more HO adsorption and activation sites. Furthermore, 10La-CeO showed enhanced Lewis basicity, making it easier for COS to adsorb and promote hydrolysis. The in situ DRIFTS results confirmed that appropriate oxygen vacancies and basic sites favored the formation of intermediates such as HCO and HSCO , promoting the decomposition of COS into HS and CO.
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| http://dx.doi.org/10.1002/asia.202400235 | DOI Listing |
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