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|標題:||Pore structure effects on Ca-based sorbent sulfation capacity at medium temperatures: Activated carbon as sorbent/catalyst support||作者:||Tseng, H.H.
|關鍵字:||calcium-carbonate;sulfur-dioxide;nitric-acid;so2;desulfurization;reactivity;adsorption||Project:||Journal of the Air & Waste Management Association||期刊/報告no：:||Journal of the Air & Waste Management Association, Volume 52, Issue 11, Page(s) 1281-1287.||摘要:||
The reaction between three different Ca-based sorbents and SO2 were studied in a medium temperature range (473-773 K). The largest SO2 capture was found with Ca(OH)(2) at 773 K, 126.31 ing SO2.g Ca(OH)(2)(-1) and the influence. of SO2 concentration on the sorbent utilization was observed. Investigations of the internal porous structure of Ca-based sorbents showed that the initial reaction rate was controlled by the surface area, and once the sulfated products were produced, pore structure dominated. To increase the surface area of Ca-based sorbents available to interact with and retain SO2, one kind of CaO/activated carbon (AC) sorbent/catalyst was prepared to study the effect of AC on the dispersion of Ca-based materials. The results indicated that the Ca-based material dispersed on high-surface-area AC had more capacities for SO2 than unsupported Ca-based sorbents. The initial reaction rates of the reaction between SO2 and Ca-based sorbents and the prepared CaO/AC sorbents/catalysts were measured. Results showed that the reaction rate apparently increased with the presence of AC. It was, concluded that CaO/AC was the active material in the desulfurization reaction. AC acting as the support can play a role to supply O-2 to increase the affinity to SO2. Moreover, when AC is acting as a support, the surface oxygen functional group formed on the surface of AC can serve as a new site for SO2 adsorption.
|Appears in Collections:||環境工程學系所|
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