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Scalable Syntheses of Graphene Oxide and Reduced Graphene Oxide using Cascade Design Oxidation and Highly Basic Reduction Reactions
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Hydrotalcite-based CeNiAl mixed oxides for SO2 adsorption and oxidation
Ling Zhao1,2, Qi Kang1, Xiongfei Guan1
1School of Ecology and Environment, Inner Mongolia University, Hohhot, People's Republic of China.
Environmental Technology
|June 6, 2018
Summary
The addition of cerium (Ce) to nickel-aluminum oxide (NiAlO) enhances sulfur dioxide (SO₂) adsorption and oxidation. This cerium-enhanced material shows improved oxygen storage, stronger Lewis acidity, and increased alkaline sites for SO₂ capture.
Area of Science:
- Materials Science
- Environmental Chemistry
- Catalysis
Background:
- Sulfur dioxide (SO₂) is a major air pollutant contributing to acid rain.
- Developing efficient adsorbents for SO₂ removal is crucial for environmental protection.
Purpose of the Study:
- To investigate the effect of cerium (Ce) on the SO₂ adsorption and oxidation properties of hydrotalcite-based CeNiAl mixed oxides.
- To understand the surface chemistry and structural changes induced by Ce incorporation.
Main Methods:
- Synthesis of flower-like hydrotalcite-based CeNiAl mixed oxides.
- Characterization using X-ray Diffraction (XRD), Brunauer–Emmett–Teller (BET) analysis, pyridine chemisorption, CO₂ temperature-programmed desorption (CO₂-TPD), X-ray Photoelectron Spectroscopy (XPS), and H₂ temperature-programmed reduction (H₂-TPR).
- In situ Fourier transform infrared spectroscopy (FTIR) to study SO₂ adsorption mechanisms.
Main Results:
- Ce incorporation into NiAlO created new oxygen storage/release centers.
- Enhanced Lewis acid strength and increased populations of weakly and strongly alkaline sites were observed.
- Improved SO₂ adsorption capacity and oxidation efficiency were demonstrated.
- In situ FTIR confirmed the formation of surface bidentate binuclear sulfate species from adsorbed SO₂.
Conclusions:
- The addition of Ce⁴⁺ significantly improves the SO₂ adsorption and oxidation performance of NiAlO.
- CeNiAl mixed oxides show promise as effective adsorbents for SO₂ removal from industrial emissions.
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