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Enhanced Activity and Water Resistance on CuO/SiO2-TiO2 Catalyst for CO Oxidation and NO Reduction by CO: The Promotion Effect of SiO2.
- Source :
- Topics in Catalysis; Jun2024, Vol. 67 Issue 13/14, p922-933, 12p
- Publication Year :
- 2024
-
Abstract
- Non-precious metal catalysts with enhanced low-temperature activity and improved water resistance are highly demanded for emission control. CuO-based catalysts are promising alternatives to precious metal catalysts due to their acceptable activity and cost-effectiveness. However, there is an urgent need to further enhance their low-temperature activity and water resistance for industrial applications. Herein, CuO catalysts supported by various SiO<subscript>2</subscript>-TiO<subscript>2</subscript> supports were prepared and evaluated for CO oxidation and NO reduction by CO reactions under the testing conditions with and without water. Among the studied catalysts with different SiO<subscript>2</subscript> contents, CuO/5SiO<subscript>2</subscript>-TiO<subscript>2</subscript>, in which CuO was supported by SiO<subscript>2</subscript>-TiO<subscript>2</subscript> with 5 wt.% SiO<subscript>2</subscript>, exhibited the best performance for CO oxidation. Compared with CuO/TiO<subscript>2</subscript> and CuO/SiO<subscript>2</subscript> reference catalysts, the CuO/5SiO<subscript>2</subscript>-TiO<subscript>2</subscript> catalyst showed enhanced catalytic activity in both CO oxidation and NO reduction by CO under dry and wet conditions. Comprehensive characterizations revealed that the presence of SiO<subscript>2</subscript> in TiO<subscript>2</subscript> support facilitated the CuO/5SiO<subscript>2</subscript>-TiO<subscript>2</subscript> catalyst with a high dispersion and reduced oxidation states of CuO<subscript>x</subscript> species. This not only improved the low-temperature reducibility but also enhanced the adsorption of reactive CO species. As a result, the CuO/5SiO<subscript>2</subscript>-TiO<subscript>2</subscript> catalyst demonstrated superior catalytic activity. Furthermore, the inclusion of SiO<subscript>2</subscript> in the catalyst inhibited H<subscript>2</subscript>O adsorption, contributing to the enhanced water resistance on CuO/5SiO<subscript>2</subscript>-TiO<subscript>2</subscript> catalyst. These advantages in catalytic activity and water resistance make CuO/5SiO<subscript>2</subscript>-TiO<subscript>2</subscript> a promising candidate for applications in emission control. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10225528
- Volume :
- 67
- Issue :
- 13/14
- Database :
- Complementary Index
- Journal :
- Topics in Catalysis
- Publication Type :
- Academic Journal
- Accession number :
- 177537985
- Full Text :
- https://doi.org/10.1007/s11244-024-01917-9