期刊
ENERGY & FUELS
卷 26, 期 2, 页码 1406-1411出版社
AMER CHEMICAL SOC
DOI: 10.1021/ef200866y
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资金
- National High Technology Research and Development Program of China [2009AA05Z311]
- National Natural Science Foundation [50876021]
- National Basic Research Program of China [2011CB707301]
- Scientific Research Foundation of Graduate School of Southeast University [YBJJ1001]
The present paper is the second part of a series of papers about a systematical investigation on the application of the K2CO3/Al2O3 sorbent for capturing CO2 in flue gas. It was focused on the regeneration behaviors of K2CO3/Al2O3 in a thermogravimetric analyzer coupled with a Fourier transform infrared spectrometer. The effects of operation conditions, including the regeneration temperature, gas composition, and heating rate, on the regeneration process of K2CO3/Al2O3 were thoroughly studied. The regeneration process of K2CO3/Al2O3 consists of three 'steps, as the temperature increases: KHCO3 is decomposed first when the temperature is lower than 180 degrees C; then, an intermediate product for the carbonation of K2CO3/Al2O3 is decomposed; and finally, KAl(CO3)(2)(OH)(2) is decomposed when the temperature is higher than 250 degrees C. The regeneration conversion of K2CO3/Al2O3 reaches 100% in 15 min when the final temperature reaches 300 degrees C in N-2. The effect of the gas composition of CO2 and CO2/H2O on the regeneration process is not significant. The regeneration conversion decreases from 100 to 92.8% and the reaction time decreases from 72 to 6.5 min when the heating rate increases from 5 to 80 degrees C/min.
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