A study on adsorption/desorption of CO2 in flue gas by ethylenediamine modified silica materials

• Main Authors: Fang-Chun Hu, 胡芳君
• Other Authors: 盧重興
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/15471525429453332840

碩士 === 國立中興大學 === 環境工程學系所 === 99 === Y-type zeolite with a Si/Al molar ratio of Y60 and Mesoporous Silica Particles(MSP) were modified by ethylenediamine (EDA), and were employed as sorbents of CO2 from gas streams. This study investigates the characteristics, modification, thermal stability and adsorption behavior as well as their regeneration and desorption properties in different operating conditions, increasing the effect of water vapor and SO2. The adsorption capacities (qe) for Y60(EDA) and MSP(EDA) were 75.02, 69.85mg/g under 15% CO2 at 60oC, the qe were decrease to 69.03, 62.85 mg/g after 100 cyclics in dry system, respectively, which the major elements will not be change. Under the same conditions with10%(v/v) of water content, the qe for Y60(EDA) and MSP(EDA) could upgrade to 94.04, 103.61 mg/g. But for 40ppm of SO2 concentration , the qe were 73.73, 67.55 mg/g for each other. The adsorption heat (ΔHa) of Y60(EDA) and MSP(EDA) were exothermic reaction. The regeneration heat (Q) for these 2 adsorbent were less than that for the wet solvent MEA. It‘s reveals that Y60(EDA) and MSP(EDA) just needs less energy for regeneration. For these reasons, Y60(EDA) and MSP(EDA) have stably qe, higher thermal stability, mild conditions regeneration, lower energy for regeneration, and specificity for CO2. The possibility of prolonged cyclic operation with a low desorption energy requirements indicate that Y60(EDA) and MSP(EDA) were two of promising adsorbent for CO2 capture from flue gas.