Multicyclic Study on the Simultaneous Carbonation and Sulfation of High-Reactivity CaO

Autor:	Himanshu Gupta, and Bartev B. Sakadjian, Liang-Shih Fan, Mahesh V. Iyer
Rok vydání:	2004
Předmět:	Flue gas Chemistry General Chemical Engineering Carbonation Mineralogy Sorption General Chemistry Residence time (fluid dynamics) Industrial and Manufacturing Engineering law.invention Sulfation Chemical engineering law Calcination Reactivity (chemistry) Mesoporous material
Zdroj:	Industrial & Engineering Chemistry Research. 43:3939-3947
ISSN:	1520-5045 0888-5885
DOI:	10.1021/ie0341911
Popis:	Micron-sized CaO, obtained by calcination of mesoporous CaCO3, attained 36 wt % CO2 sorption capacity after 100 cycles of carbonation and calcination reactions at 700 °C. The extent of simultaneous carbonation (XCO2) and sulfation (XSO2) of CaO at 700 °C was obtained under simulated flue gas conditions (10% CO2, 3000 ppm of SO2, 4% O2 in N2). CaO reacts with SO2 to form thermally stable CaSO4, which leads to a reduction in the CO2 capture capacity of CaO. Whereas XSO2 increases monotonically with the residence time, XCO2 goes through a maximum and eventually drops as a result of direct sulfation of CaCO3. The maximum value attained by XCO2 was 50% in 10 min in the first cycle. The highest XCO2/XSO2 ratio of 5 is attained at a residence time of 5 min. XSO2 is higher under simultaneous carbonation and sulfation conditions compared to sulfation of CaO or direct sulfation of CaCO3.
Databáze:	OpenAIRE
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