Enhancing CO oxidation performance by controlling the interconnected pore structure in porous three-way catalyst
Duhaul Biqal Kautsar1, Phong Hoai Le1, Ai Ando1
1Chemical Engineering Program, Department of Advanced Science and Engineering, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi Hiroshima, Hiroshima 739-8527, Japan. ogit@hiroshima-u.ac.jp.
Nanoscale
|January 21, 2025
Summary
Highly ordered porous particles with interconnected pores boost catalytic performance. Controlling pore structure, framework thickness, and macroporosity enhances three-way catalyst (TWC) efficiency for emission control.
Area of Science:
- Materials Science
- Catalysis
- Nanotechnology
Background:
- Highly ordered porous structured particles with three-way catalyst (TWC) nanoparticles show promise for catalytic applications.
- Controlling pore arrangement, specifically interconnected pore structures, remains a challenge.
- The relationship between pore structure (framework thickness, macroporosity) and reactant diffusion for optimal catalytic performance needs further investigation.
Purpose of the Study:
- To control the interconnected pore structure of porous TWC particles by adjusting precursor components.
- To analyze the internal structure and porous properties (framework thickness, macroporosity) of these particles.
- To establish mathematical models for predicting pore structure and identifying conditions for interconnected pore formation.
Main Methods:
- Template-assisted spray process to control pore structure.
- Cross-sectional image analysis to examine internal structure and porous properties.
- Mathematical modeling to predict framework thickness, macroporosity, and pore formation.
Main Results:
- Successfully controlled interconnected pore structures by adjusting template particle concentration.
- Developed mathematical equations to predict framework thickness and macroporosity.
- Identified critical conditions for forming interconnected pores versus broken structures.
Conclusions:
- Porous TWC particles with interconnected pores, thin frameworks, and high macroporosity demonstrate superior catalytic performance.
- Effective diffusion and utilization of internal catalytic sites are key to high performance.
- Findings offer insights for designing advanced porous TWC particles for improved exhaust emission control.
