期刊
CHEMICAL ENGINEERING SCIENCE
卷 170, 期 -, 页码 48-57出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2017.01.049
关键词
Post combustion CO2 capture; Catalytic desorption; Heat duty; Bronsted acid/Lewis acid site ratio; Carbamate breakdown; Solid acid catalyst
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation
- Clean Energy Technologies Research Institute (CETRI)
- Faculty of Graduate Study and Research (FGSR), University of Regina
The role of a solid acid catalyst in reducing the heat duty for solvent regeneration in post-combustion CO2 was elucidated for the first time using two types of solid acid catalysts (HZSM-5 and gamma-Al2O3) in the desorber of a bench scale unit for CO2 capture with 5 mol/L MEA solution at the catalyst bed temperature maintained at 85 degrees C using 15 SLPM of feed gas with composition of 15% CO2 in N-2. The process performance was evaluated in terms of the cyclic capacity, absorption efficiency and heat duty. The results show that HZSM-5 and gamma-Al2O3 facilitated CO2 desorption from a CO2-loaded MEA solution by increasing both the cyclic capacity and absorption efficiency, thereby lowering the heat duty. HZSM-5 (predominantly a proton donor catalyst) facilitated the carbamate breakdown by providing a free proton, and increased the absorption efficiency by 38% while reducing the heat duty by 42% as compared to the non-catalytic condition. gamma-Al2O3 (predominantly an electron accepter catalyst) improved absorption efficiency by 23.6% and reduced heat duty by 30% over that of the non catalytic conditions. Based on energy distribution analysis, when a catalyst was used, sensible heat decreased while the heat of desorption and heat of vaporization had insignificant changes. A statistical analysis was performed to show which characteristics of the catalysts had the most influence on process performance by testing five catalytic conditions (HZSM-5, gamma-Al2O3, HY, silica-alumina, and no catalyst) with widely different catalytic properties. The resulting correlations indicate that the acid strength of the catalyst had the most important role in facilitating CO2 desorption from a CO2-loaded MEA solution followed by the Bronsted acid/Lewis acid (B/L) ratio. (C) 2017 Elsevier Ltd. All rights reserved.
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