Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/5683
標題: 胺丙基三甲氧基矽烷改質矽材吸附煙道氣中二氧化碳之研究
A study on adsorption/desorption of CO2 in flue gas by ethylenediamine modified silica materials
作者: 胡芳君
Hu, Fang-Chun
關鍵字: CO2 capture
二氧化碳捕獲
Surface modification
Zeolite
Mesoporous silica particles
Regeneration
表面改質
沸石
中孔洞矽材
循環吸附
出版社: 環境工程學系所
摘要: 本研究選用Si/Al為60之Y型沸石(簡稱Y60)及中孔洞矽材(Mesoporous Spherical-Silica Particles,簡稱 MSP) 為吸附材,經胺類改質劑ethylenediamine(EDA)分別進行表面改質後,針對煙道除硫系統(flue gas desulfurization, FGD)後端之尾氣,進行吸附二氧化碳(CO2)效率測試並評估實場應用之可行性。研究中將測試Y60(EDA)與MSP(EDA)之物理化學特性、最佳改質條件及於含水氣或SO2環境下的循環吸脫附效率,最後亦對成本進行分析以瞭解吸附材於實場之可行性。經研究結果顯示,Y60(EDA)與MSP(EDA)之qe可達75.02、69.85mg/g,於乾式循環100次後,qe略降至69.03、62.85 mg/g,其吸附指標均能維持於92%,且於循環試程前後之主要組成元素含量並無顯著影響。而於含水氣之循環系統中,Y60(EDA)與MSP(EDA)之qe則由94.04、103.61 mg/g降至75.19、73.15 mg/g,顯示在水氣環境下將可提升吸附材對CO2之捕捉效率。而低濃度的SO2對吸附材將產生競爭吸附的現象,使其qe將較乾式循環的qe些微下降至73.73、67.55 mg/g。經再生熱分析,Y60(EDA)與MSP(EDA)之吸附熱(ΔHa)均屬於放熱反應中之化學性吸附,且其脫附熱(ΔHd)亦均高於ΔHa。而吸附材於再生時所需之總能量(Q),因皆遠小於30%之濕式吸收劑MEA所需的能量,表示Y60(EDA)與MSP(EDA)之脫附成本將可較濕式吸收劑MEA低許多,故於未來實場運用上較MEA符合其經濟效應。結合實驗結果顯示,Y60(EDA)與MSP(EDA)擁有穩定之吸附量、較高的熱穩定性、脫附條件對環境友善且溫和、再生所需能量較低、對CO2具有專一性且不受煙道氣中其它氣體影響之特性,隨著綠色科技迅速發展,本研究之吸附材於未來煙道氣中溫室氣體捕捉的應用將極具開發之潛力。
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.
URI: http://hdl.handle.net/11455/5683
Appears in Collections:環境工程學系所

文件中的檔案:

取得全文請前往華藝線上圖書館



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.