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Ce–Fe bimetallic oxide catalysts for CO catalytic oxidation at a high concentration of SO2.
- Source :
- New Journal of Chemistry; 11/28/2023, Vol. 47 Issue 44, p20327-20335, 9p
- Publication Year :
- 2023
-
Abstract
- A series of Ce–Fe bimetallic oxide catalysts were prepared by a hydrothermal method for CO catalytic oxidation at a high concentration of SO<subscript>2</subscript> in this paper. Ce<subscript>0.7</subscript>Fe<subscript>0.3</subscript> showed the highest catalytic performance in CO oxidation, reaching higher than 97% CO conversion at above 300 °C in the flue gas containing 1000 ppm CO. When the concentration of SO<subscript>2</subscript> in the flue gas increased to 1000 mg m<superscript>−3</superscript>, the CO conversion of Ce<subscript>0.7</subscript>Fe<subscript>0.3</subscript> remained 86% for 10 hours. The doping of Fe into the CeO<subscript>2</subscript> lattice resulted in the formation of a CeO<subscript>2</subscript>-like solid solution and the increase in the oxygen vacancy concentration in Ce<subscript>0.7</subscript>Fe<subscript>0.3</subscript>, thus facilitating the CO oxidation activity of Ce<subscript>0.7</subscript>Fe<subscript>0.3</subscript>. In the flue gas containing SO<subscript>2</subscript>, the doping of Fe showed positive effects of resisting the change in crystallinity and mitigating the loss of pore structure. The sulfation of CeO<subscript>2</subscript> could lead to the formation of Ce<subscript>2</subscript>(SO<subscript>4</subscript>)<subscript>3</subscript> on the surface, which deactivated the catalyst. The doping of Fe inhibited the reduction of Ce<superscript>4+</superscript> to Ce<superscript>3+</superscript> by SO<subscript>2</subscript>, thereby preventing the formation of Ce<subscript>2</subscript>(SO<subscript>4</subscript>)<subscript>3</subscript>. Furthermore, a small amount of sulfate was deposited on the surface of Ce<subscript>0.7</subscript>Fe<subscript>0.3</subscript>, exhibiting poorer thermal stability than that deposited on CeO<subscript>2</subscript>. The Fe-doping modification played a positive role in enhancing the CO oxidation activity and SO<subscript>2</subscript>-poisoning resistance of Ce<subscript>0.7</subscript>Fe<subscript>0.3</subscript>. [ABSTRACT FROM AUTHOR]
- Subjects :
- CATALYTIC oxidation
BIMETALLIC catalysts
FLUE gases
POROSITY
SULFATION
OXIDATION
Subjects
Details
- Language :
- English
- ISSN :
- 11440546
- Volume :
- 47
- Issue :
- 44
- Database :
- Complementary Index
- Journal :
- New Journal of Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 173555607
- Full Text :
- https://doi.org/10.1039/d3nj02387g