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Catalytic oxidation of high-concentration CO over La0.9M0.1CoO3 (M = Ce, Sr) facilely promoted by glucose.
- Source :
- New Journal of Chemistry; 11/28/2021, Vol. 45 Issue 44, p20629-20640, 12p
- Publication Year :
- 2021
-
Abstract
- Glucose-free and glucose-containing LaCoO<subscript>3</subscript>(-G), La<subscript>0.9</subscript>Sr<subscript>0.1</subscript>CoO<subscript>3</subscript>(-G), and La<subscript>0.9</subscript>Ce<subscript>0.1</subscript>CoO<subscript>3</subscript>(-G) perovskite catalysts were synthesized via the sol–gel method, over which the oxidation performance of high-concentration CO was investigated. The experimental results indicate that the catalytic activity can be improved by facilely adding glucose during the preparation where glucose creates a reducing atmosphere and takes away the oxygen atoms of perovskites to form more oxygen vacancies and Co<superscript>3+</superscript>. CO self-sustained combustion is favorably achieved and La<subscript>0.9</subscript>Ce<subscript>0.1</subscript>CoO<subscript>3</subscript>-G shows the best catalytic performance. Combining the XPS, H<subscript>2</subscript>-TPR, O<subscript>2</subscript>-TPD and CO-TPD results, the outstanding performance of La<subscript>0.9</subscript>Ce<subscript>0.1</subscript>CoO<subscript>3</subscript>-G is mainly ascribed to the relatively higher concentrations of Co<superscript>3+</superscript>, Ce<superscript>3+</superscript> and oxygen vacancies. The reaction was found to follow the Langmuir–Hinshelwood (L–H) mechanism by in situ IR spectroscopy and kinetic results. Furthermore, La<subscript>0.9</subscript>Ce<subscript>0.1</subscript>CoO<subscript>3</subscript>-G exhibits good high-temperature durability with unchanged CO conversion of 100% at 760 °C. It is suggested that the addition of glucose and the impregnation of Sr or Ce in perovskites is a feasible strategy to design industrial catalysts for CO self-sustained combustion. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 11440546
- Volume :
- 45
- Issue :
- 44
- Database :
- Complementary Index
- Journal :
- New Journal of Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 153575485
- Full Text :
- https://doi.org/10.1039/d1nj04050b