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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
Nanosized Pt-Co catalysts for the preferential CO oxidation
Eun-Yong Ko1, Eun Duck Park, Kyung Won Seo
1Department of Chemical Engineering, Division of Chemical Engineering and Materials Engineering, Ajou University, Wonchun-Dong Yeongtong-Gu Suwon, 443-749, Republic of Korea.
Journal of Nanoscience and Nanotechnology
|January 27, 2007
Summary
Platinum-cobalt catalysts on gamma-alumina show enhanced preferential CO oxidation in hydrogen-rich streams. Optimal performance was achieved with a 10:1 Co:Pt molar ratio and high-temperature reductive pretreatment.
Area of Science:
- Catalysis
- Materials Science
- Chemical Engineering
Background:
- Selective CO oxidation is crucial for purifying hydrogen streams in fuel cells and chemical processes.
- Platinum-cobalt alloy catalysts supported on gamma-alumina (Pt-Co/gamma-Al2O3) are investigated for their activity in preferential CO oxidation (PROX).
Purpose of the Study:
- To investigate the effect of cobalt loading on the catalytic activity of Pt-Co/gamma-Al2O3 for preferential CO oxidation.
- To determine the optimal composition and preparation method for Pt-Co/gamma-Al2O3 catalysts.
- To understand the role of reductive pretreatment on catalyst performance.
Main Methods:
- CO chemisorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray spectrometry (EDX), and temperature-programmed reduction (TPR) were used for catalyst characterization.
- Catalytic activity testing for CO oxidation and methanation at low temperatures.
- Evaluation of CO2 selectivity under various reaction conditions.
Main Results:
- Catalytic activity for CO oxidation and methanation increased with cobalt content, correlating with a shift in TPR peaks to lower temperatures.
- An optimal Co:Pt molar ratio of 10:1 was identified.
- Co-impregnated catalysts (Pt-Co/gamma-Al2O3) outperformed sequentially impregnated catalysts (Pt/Co/gamma-Al2O3 and Co/Pt/gamma-Al2O3).
- Reductive pretreatment at 773 K significantly enhanced CO2 selectivity across a broad temperature range.
Conclusions:
- The formation of a Pt-Co bimetallic phase is responsible for the high catalytic activity in selective CO oxidation within H2-rich streams.
- Optimized Pt-Co/gamma-Al2O3 catalysts, particularly co-impregnated ones with a 10:1 Co:Pt ratio and subjected to high-temperature reductive pretreatment, offer superior performance for PROX applications.
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