- 期刊
氧化鈣系奈米材料於中高溫二氧化碳捕捉技術之研究
The Characterization of Calcium Based Sorbent for CO_2 Sorption at High Temperature
摘要
本研究利用醋酸鈣、碳酸鈉、乙烯二胺四乙酸(ethylenediaminetetraacetic acid, EDTA)及聚乙烯亞胺(polyethyleneimine, PEI)做為起始物，研究含鈣奈米膠體之分散控制及CaO奈米粉體之合成技術。含有鈣的奈米微粒可藉由螯合劑EDTA 與水溶性高分子之雙重隔離作用，使得尺寸被穩定控制在15 nm，研究結果顯示最佳的參數為CaAc_2：EDTA：PEI重量比例1：2.4：0.8。利用鈣的奈米膠體可合成2類含有CaO之材料，即CaO粉末與CaO固定於MG50(鎂-鋁碳酸鹽)基材粉體，並以SEM、XRD、BET分析其特性。另以熱重分析儀(TGA)測試CaO於600-800°C之捕碳能力，紅外光譜儀(FTIR)探討不同溫度之特性官能基變化。結果顯示自製CaO皆能於700°C成功完成捕碳功能，捕集量為49-86% CO_2 g/gCaO，效果皆優於市售CaO粉末。CaO/MG50為其中最佳的材料，最初的捕碳量為86% CO_2 g/gCaO，經過9次的捕碳及再生迴路仍具有96%的最初的捕碳量。
關鍵字
CO_2捕捉並列摘要
In this work, calcium oxide (calcite) nanoparticle was prepared using calcium acetate, sodium bicarbonate, ethylenediaminetetraacetic acid (EDTA) and different amount of polye-thylene imines (PEI). Calcium ion was chelated by EDTA and then dispersed by surrounding hydrophilic PEI polymer. The size of Ca-nanoparticle could be maintained at 15 nm by controlling the optimum ratio of Ca : EDTA : PEI at 1 : 2.4 : 0.8 by weight. Prepared calcite was used to test CO_2 sorption capacity under 600-800 °C by TGA and its carbonated product was checked by FTIR. Another solid sorbent was synthesized by CaO nanoparticle embedded MG50 powder (Mg-Al hydrotalcite) after appropriate temperature treatment. The result showed that the CO_2 capture capacity was 49- 86% CO_2 g/gCaO by prepared CaO at 700 °C. In comparison to commercially available CaO, CaO/MG50 sorbent has capturing capacity at 86% CO_2 g/gCaO and provides 96% sorption recovery at nine carbon cycle (carbonization/decarbonization) tests.
延伸閱讀
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