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The Effect of Precursor Concentration on the Crystallite Size of CeO 2 to Enhance the Sulfur Resistance of Pt/CeO 2 for Water Gas Shift.
- Source :
- Catalysts (2073-4344); Feb2024, Vol. 14 Issue 2, p99, 15p
- Publication Year :
- 2024
-
Abstract
- To develop customized sulfur–resistant catalysts for the water gas shift (WGS) reaction in the waste–to–hydrogen process, the effects of changing the nucleation conditions of the CeO<subscript>2</subscript> support on catalytic performance were investigated. Supersaturation is a critical kinetic parameter for nuclei formation. The degree of supersaturation of the CeO<subscript>2</subscript> precipitation solution was controlled by varying the cerium precursor concentration from 0.02 to 0.20 M. Next, 2 wt.% of Pt was impregnated on those various CeO<subscript>2</subscript> supports by the incipient wetness impregnation method. The prepared samples were then evaluated in a WGS reaction using waste–derived synthesis gas containing 500 ppm H<subscript>2</subscript>S. The Pt catalyst supported by CeO<subscript>2</subscript> prepared at the highest precursor concentration of 0.20 M exhibited the best sulfur resistance and catalytic activity regeneration. The sulfur tolerance of the catalyst demonstrated a close correlation with its oxygen storage capacity and easier reducibility. The formation of oxygen vacancies in CeO<subscript>2</subscript> supports is promoted by the formation of small crystals due to a high degree of supersaturation. [ABSTRACT FROM AUTHOR]
- Subjects :
- WATER-gas
SYNTHESIS gas
SULFUR
WATER gas shift reactions
POLYWATER
CERIUM oxides
Subjects
Details
- Language :
- English
- ISSN :
- 20734344
- Volume :
- 14
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Catalysts (2073-4344)
- Publication Type :
- Academic Journal
- Accession number :
- 175653586
- Full Text :
- https://doi.org/10.3390/catal14020099