2015-08-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/703853摘要：鹼性金屬氧化物碳化／&#28997;燒迴圈捕碳(alkaline metal oxides-based looping process)是一種適用於大 量定點排放源高溫捕集分離二氧化碳技術，目前面臨的挑戰是如何增加鹼土元素在高溫下的遷移阻力，抑制鹼土金屬氧化物晶粒的燒結，從而提高材料碳化／&#28997;燒迴圈穩定性。本研究為三年期計畫，第一年以自行建置之一步驟自主裝霧化系統，快速且連續地製得高表面積、中孔洞鹼性金屬氧化物微米球。探討製得鹼性材料對二氧化碳的捕集容量、動力與熱力學參數。藉由調控製備條件，製作具高表面積且高效率捕集二氧化碳的中孔洞材料，系統性地探討製備參數對材料結構、表面型貌、吸收劑含量與顆粒大小等特徵的影響。第二年將以前期之實驗參數作為基礎，開發可量產之中高溫捕碳劑(製程規模化設計，水泥廠的石灰，商業水滑石等)，並應用於中高溫碳酸化/&#28997;燒迴圈的二氧化碳吸附技術純化燃燒煙氣中之二氧化碳，調查經數次循環試驗後材料之物化特性與製得材料之差異程度，擬訂改善策略，以延長吸收劑使用壽命。第三年則以GC 理念結合LCA的評估方法，改變「搖籃到墳墓」的概念，以「搖籃到搖籃」的觀念，將前期之中高溫捕碳劑作比較，包含原料、製作、能源使用與投入、製造與運輸、產品使用與最終處置等。將所有的輸出與輸入轉換成對環境的衝擊量，以作為二氧化碳捕集最終評估的依據。本研究之結果將可提供相關產業建構一套有效捕集二氧化碳系統之參考，希冀有效解決當前二氧化碳溫室效應的環境問題。<br> Abstract: Alkaline metal oxides-based looping process is a CO2 capture scheme using solid sorbents to remove CO2 from the large anthropogenic point source, producing a concentrated stream of CO2 suitable for storage. However, the rate of carbonation of alkaline metal oxides make a transition from a fast to a very slow diffusion-controlled rate. In this 3 years project, we combined the wet chemical route with an aerosol-assisted self-assembly process to prepare alkaline metal oxide micro spheres with high surface area and crystallinity for CO2 capture through alkaline metal oxides-based looping process at first year. For second year, we develop a mass production process for CO2 capture capacities and cyclic carbonation／calcination (650~900 oC) stability based on the data obtained from first year. The obtained solid adsorbents were characterized by SEM, TEM, N2 adsorption isotherms, XRD, and XPS. For third year, life cycle assessment (LCA) combining with green chemistry (GC) were used to calculate the environmental impacts of environmentally-friendly processes for CO2 capture including the stages of producing alkaline metal oxide micro spheres, commercial CaO etc. and cyclic carbonation／calcination performance. In addition to advancing the support, the present study will provide another cost-efficient and general approach to design high performance CO2 solid sorbents and may have a major impact on the advance of current carbon capture and storage technologies.鹼性金屬氧化物微米球二氧化碳Alkaline Metal OxidesMicro SpheresCO2