Removal of CO2 by CaO/MgO and CaO/Ca9Al6O18 in the Presence of SO2

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• 作者：Mingnv Guo ; Li Zhang ; Zhongqing Yang ; Qiang Tang
• 刊名：Energy & Fuels
• 出版年：2011
• 出版时间：November 17, 2011
• 年：2011
• 卷：25
• 期：11
• 页码：5514-5520
• 全文大小：936K
• 年卷期：v.25,no.11(November 17, 2011)
• ISSN：1520-5029

文摘

Sorbents with their components CaO/MgO and CaO/Ca₉Al₆O₁₈ were produced from calcium d-gluconate monohydrate, magnesium d-gluconate hydrate, and aluminum l-lactate hydrate as precursors with a simple wet mixing method. The effects of sorbents type, mass proportion, SO₂ concentration, and calcination temperature on sorbent capability were studied. The results show that CaO/MgO (75:25%, w/w) kept the best CO₂-capture capability, while CaO/Ca₉Al₆O₁₈ (75:25%, w/w) kept the best cyclic stability. The CO₂-capture process is drastically blocked when SO₂ exists. The CO₂-capture capacity drops quickly when the SO₂ concentration is promoted. However, the cumulative SO₂-capture capacity increases at the same time. The total calcium use rises tenderly after many cycles, and the tendency becomes more obvious with an increasing SO₂ concentration. The effect of the calcination temperature on CaO/MgO and CaO/Ca₉Al₆O₁₈ absorption characteristics shows little difference.