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Pore structure effects on Ca-based sorbent sulfation capacity at medium temperatures: activated carbon as
Hui-Hsin Tseng1, Ming-Yen Wey, Chiou-Liang Lin
1Department of Environmental Engineering, National Chung-Hsing University, Taiwan, Republic of China.
Journal of the Air & Waste Management Association (1995)
|December 10, 2002
Summary
Calcium-based sorbents effectively capture sulfur dioxide (SO2) at high temperatures. Combining calcium oxide with activated carbon (AC) significantly enhances SO2 capture capacity and reaction rates.
Area of Science:
- Environmental Chemistry
- Materials Science
- Chemical Engineering
Background:
- Sulfur dioxide (SO2) emissions pose environmental risks, necessitating efficient capture technologies.
- Calcium-based sorbents are widely studied for SO2 removal, but their efficiency can be limited by surface area and pore structure.
- Activated carbon (AC) possesses high surface area and unique surface properties that can potentially enhance sorbent performance.
Purpose of the Study:
- To investigate the SO2 capture performance of different calcium-based sorbents at medium temperatures (473-773 K).
- To explore the effect of activated carbon (AC) as a support on the dispersion and SO2 capture capabilities of calcium-based sorbents.
- To understand the role of AC in enhancing the reaction kinetics and capacity for SO2 removal.
Main Methods:
- Studied the reaction of three Ca-based sorbents with SO2 in a temperature range of 473-773 K.
- Analyzed the internal porous structure of sorbents to understand reaction mechanisms.
- Prepared and tested CaO/AC sorbent/catalysts to evaluate the effect of AC on SO2 capture and reaction rates.
Main Results:
- Calcium hydroxide (Ca(OH)2) showed the highest SO2 capture (126.31 mg SO2/g) at 773 K.
- Initial reaction rates were influenced by surface area, while pore structure dominated after sulfation.
- CaO/AC sorbents exhibited significantly higher SO2 capture capacities and reaction rates compared to unsupported sorbents.
- AC enhanced SO2 affinity and provided additional adsorption sites through surface oxygen functional groups.
Conclusions:
- CaO/AC composite materials are highly effective for SO2 desulfurization.
- Activated carbon acts as a crucial support, improving calcium dispersion and enhancing reaction kinetics.
- The enhanced performance of CaO/AC is attributed to increased surface area, improved SO2 affinity, and additional adsorption sites provided by AC.