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Dry desulphurisation of gas streams using KCC-1 mesoporous silica functionalised with deep eutectic solvents
Mohd Saiful Adli Azizman1, Muhammad Adli Hanif1, Naimah Ibrahim1,2
1Faculty of Civil Engineering & Technology, Universiti Malaysia Perlis, Arau, Perlis, 02600, Malaysia. naimah@unimap.edu.my.
Physical Chemistry Chemical Physics : PCCP
|November 1, 2024
Summary
This study enhances dry flue gas desulphurisation (FGD) by modifying fibrous silica (KCC-1) with deep eutectic solvents. Modified KCC-1 shows significantly improved sulfur dioxide (SO2) adsorption, offering a promising alternative to traditional wet FGD methods.
Area of Science:
- Environmental Science
- Materials Science
- Chemical Engineering
Background:
- Sulphur dioxide (SO2) is a major toxic gas pollutant from fossil fuel combustion and ore smelting.
- Wet flue gas desulphurisation (FGD) is efficient but faces challenges like wastewater treatment and high water usage.
- Dry FGD offers an alternative, but requires modified and regenerable sorbents for efficient SO2 removal.
Purpose of the Study:
- To investigate the use of fibrous mesoporous silica (KCC-1) modified with deep eutectic solvents (DES) for dry SO2 desulphurisation.
- To evaluate the SO2 adsorption capacity of KCC-1 modified with choline chloride-glycerol (DES1) and choline chloride-ethylene glycol (DES2).
- To understand the adsorption mechanisms and kinetics of SO2 on the modified sorbents.
Main Methods:
- Modification of KCC-1 with two types of DES: choline chloride-glycerol (DES1) and choline chloride-ethylene glycol (DES2).
- Testing the SO2 adsorption capacity of unmodified and modified KCC-1 under various conditions.
- Analysis of adsorption data using kinetic (Avrami) and isotherm (Toth) models.
Main Results:
- KCC-1 modified with DES1 achieved an SO2 adsorption capacity of 4.83 mg g-1, 1.73 times higher than unmodified KCC-1.
- DES1-modified KCC-1 showed twice the adsorption capacity compared to KCC-1 modified with DES2, attributed to higher porosity.
- Adsorption capacity decreased with increasing reaction temperature and SO2 concentration; models indicated exothermic, multilayer adsorption on a heterogeneous surface.
Conclusions:
- Fibrous mesoporous silica (KCC-1) modified with choline chloride-glycerol (DES1) is an effective sorbent for dry flue gas desulphurisation.
- The modified KCC-1 offers a promising, efficient alternative to conventional wet FGD, addressing its associated environmental drawbacks.
- The high porosity and specific DES modification provide enhanced sites for SO2 adsorption, improving desulphurisation efficiency.
