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Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
Published on: August 23, 2018
Atomically dispersed Ru catalysts for polychlorinated aromatic hydrocarbon oxidation
Shuai Yang1, Xinyang Li1, Jiawen Ma1
1Tianjin Key Laboratory of Clean Energy and Pollutant Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China. guohaiwei@hebut.edu.cn.
Atomically dispersed ruthenium catalysts (Ru ADCs) show enhanced activity and stability for polychlorinated aromatic hydrocarbon (PCAH) oxidation. These Ru ADCs offer a cost-efficient strategy for PCAH oxidation compared to ruthenium nanoparticles.
Area of Science:
- Catalysis
- Materials Science
- Environmental Chemistry
Background:
- Polychlorinated aromatic hydrocarbons (PCAHs) pose environmental risks, necessitating efficient oxidation catalysts.
- Developing cost-effective and highly active catalysts is crucial for PCAH remediation.
Purpose of the Study:
- To synthesize and characterize atomically dispersed ruthenium catalysts (Ru ADCs) for PCAH oxidation.
- To evaluate the catalytic performance of Ru ADCs compared to ruthenium nanoparticles (Ru NPs).
Main Methods:
- Synthesis of Ru ADCs and Ru NPs.
- Characterization using aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (AC-HAADF-STEM) and X-ray absorption spectroscopy (XAS).
- Catalytic oxidation experiments and kinetic studies (temperature-programmed reduction/desorption).
Main Results:
- 0.2 Ru ADCs exhibited enhanced catalytic activity (T50% < 250 °C, T90% < 300 °C) compared to Ru NPs (T90% > 300 °C).
- Ru ADCs achieved high CO2 yield (>60%) and stability (>80% conversion for 800 min).
- Lower apparent activation energy (50.8 kJ mol⁻¹) for Ru ADCs versus Ru NPs (80.0 kJ mol⁻¹).
Conclusions:
- Atomically dispersed Ru catalysts demonstrate superior performance for PCAH oxidation.
- Stronger Ru-support interaction in Ru ADCs enhances dispersion and inhibits aggregation, leading to improved catalytic activity.
- This work presents a strategy for maximizing noble metal catalyst utilization in PCAH oxidation.
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