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The Enhancement of CO Oxidation Performance and Stability in SO 2 and H 2 S Environment on Pd-Au/FeO X /Al 2 O 3 Catalysts.
- Source :
- Materials (1996-1944); May2023, Vol. 16 Issue 10, p3755, 17p
- Publication Year :
- 2023
-
Abstract
- Carbon monoxide (CO) is a colourless, odourless, and toxic gas. Long-term exposure to high concentrations of CO causes poisoning and even death; therefore, CO removal is particularly important. Current research has focused on the efficient and rapid removal of CO via low-temperature (ambient) catalytic oxidation. Gold nanoparticles are widely used catalysts for the high-efficiency removal of high concentrations of CO at ambient temperature. However, easy poisoning and inactivation due to the presence of SO<subscript>2</subscript> and H<subscript>2</subscript>S affect its activity and practical application. In this study, a bimetallic catalyst, Pd-Au/FeO<subscript>x</subscript>/Al<subscript>2</subscript>O<subscript>3</subscript>, with a Au:Pd ratio of 2:1 (wt%) was formed by adding Pd nanoparticles to a highly active Au/FeO<subscript>x</subscript>/Al<subscript>2</subscript>O<subscript>3</subscript> catalyst. Its analysis and characterisation proved that it has improved catalytic activity for CO oxidation and excellent stability. A total conversion of 2500 ppm of CO at −30 °C was achieved. Furthermore, at ambient temperature and a volume space velocity of 13,000 h<superscript>−1</superscript>, 20,000 ppm CO was fully converted and maintained for 132 min. Density functional theory (DFT) calculations and in situ FTIR analysis revealed that Pd-Au/FeO<subscript>x</subscript>/Al<subscript>2</subscript>O<subscript>3</subscript> exhibited stronger resistance to SO<subscript>2</subscript> and H<subscript>2</subscript>S adsorption than the Au/FeO<subscript>x</subscript>/Al<subscript>2</subscript>O<subscript>3</subscript> catalyst. This study provides a reference for the practical application of a CO catalyst with high performance and high environmental stability. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19961944
- Volume :
- 16
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Materials (1996-1944)
- Publication Type :
- Academic Journal
- Accession number :
- 163967771
- Full Text :
- https://doi.org/10.3390/ma16103755