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Degradation mechanism of toluene over Ce-M (Cu, Co and Fe) catalysts: Effect of oxygen vacancies on reaction intermediates.
- Source :
-
Applied Surface Science . Apr2024, Vol. 652, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- A series of Ce-M(Cu, Co and Fe) catalysts were synthesized via sol–gel methods. In situ DRIFTS was introduced to explored the process of toluene degradation, confirming oxygen vacancies played an important role. [Display omitted] • Ce-Cu sample exhibited best catalytic activity and stability for toluene oxidation. • Superb activity was attributed to high Ce3+/ Ce4+ and high O ads /O latt. • The oxygen vacancies were modulated by different metal doping. • Benzoic acid was key intermediates in toluene catalysis by in situ DRIFT analysis. A series of CeO 2 samples modified with various metals M (M = Cu, Co and Fe) were synthesized via a simple sol–gel approach. The experimental results showed that there were significant differences in the catalytic activities between different metal-doped Ce-based catalysts. The Ce-Cu sample possessed excellent catalytic activity at low temperatures, and 90 % conversion of toluene was at 255 ℃, which was due to the presence of ample oxygen vacancies (O v). Three degradation pathways for toluene oxidation were inferred based on the in situ DRIFTS. The Ce-Cu catalysts possessed abundant O v , which improved the conversion between O ads → O latt and the breakage of aromatic rings, thus reducing the production of intermediates. The Ce-Co and Ce-Fe catalysts owned few amounts of O v species, leading to an extensive amount of by-products. Furthermore, the loss of active sites inhibited the reaction rate, causing the inferior catalytic performance of the Ce-Co and Ce-Fe samples. [ABSTRACT FROM AUTHOR]
- Subjects :
- *COPPER
*TOLUENE
*CATALYSTS
*CATALYTIC activity
*CERIUM oxides
*BENZOIC acid
Subjects
Details
- Language :
- English
- ISSN :
- 01694332
- Volume :
- 652
- Database :
- Academic Search Index
- Journal :
- Applied Surface Science
- Publication Type :
- Academic Journal
- Accession number :
- 174917387
- Full Text :
- https://doi.org/10.1016/j.apsusc.2023.159272