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Sub-nanocatalysis for Efficient Aqueous Nitrate Reduction: Effect of Strong Metal-Support Interaction
Jiacheng Li1, Miao Li1, Xu Yang1
1School of Environment , Tsinghua University , Beijing 100084 , China.
ACS Applied Materials & Interfaces
|September 6, 2019
Summary
Magnetic ferroferric oxide supported palladium-indium (Pd-In) sub-nanoparticles efficiently catalyze nitrate reduction. This novel catalyst offers high selectivity for nitrogen in water treatment and ammonia recovery applications.
Area of Science:
- Materials Science
- Catalysis
- Environmental Science
Background:
- Nitrate contamination in water poses significant environmental and health risks.
- Developing efficient and selective catalysts for nitrate reduction is crucial for water purification.
- Sub-nanoscale catalysts offer unique properties for enhanced chemical reactions.
Purpose of the Study:
- To investigate the use of magnetic ferroferric oxide-supported bimetallic palladium-indium (Pd-In) cluster sub-nanoparticles for catalytic nitrate reduction.
- To explore the impact of catalyst size (nano- vs. sub-nanoscale) on catalytic activity and selectivity.
- To understand the metal-support interactions and catalytic mechanism.
Main Methods:
- Synthesis of magnetic ferroferric oxide-supported Pd-In bimetallic cluster sub-nanoparticles.
- Characterization using various techniques to confirm structure and properties.
- Catalytic testing for nitrate reduction under different conditions.
- Density Functional Theory (DFT) calculations to elucidate the catalytic mechanism.
Main Results:
- Highly dispersed Pd-In active centers on FeO support with strong metal-support interaction.
- Excellent cyclic activity and high selectivity towards nitrogen for water treatment applications.
- Sub-nanoscale Pd-In catalysts exhibited higher activity in nitrate reduction (denitration) compared to their nanometer counterparts.
- Langmuir-Hinshelwood model indicated a larger rate constant for nitrate conversion on sub-nanoparticles.
- High turnover frequency and ammonia selectivity achieved with sub-nanocatalysts.
Conclusions:
- Magnetic FeO-supported Pd-In nanoparticles and sub-nanoparticles are effective catalysts for nitrate reduction.
- Sub-nanoscale Pd-In catalysts show superior activity for nitrate removal and potential for ammonia recovery.
- The unique properties of the FeO support and the sub-nanoscale active centers enhance catalytic performance.
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