Study of Flue Gas Desulfurization Absorbent Prepared from Coal Fly Ash: Effects of the Composition of the Absorbent on the Activity

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• 作者：Hiroaki Tsuchiai ; Tomohiro Ishizuka ; Hideki Nakamura ; Tsutomu Ueno ; and Hideshi Hattori
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：1996
• 出版时间：July 1996
• 年：1996
• 卷：35
• 期：7
• 页码：2322 - 2326
• 全文大小：275K
• 年卷期：v.35,no.7(July 1996)
• ISSN：1520-5045

文摘

The absorbents for SO₂ and NO from flue gas wereprepared from calcium hydroxide, calciumsulfate, silicic acid, and aluminum hydroxide. The effects of thecomposition of the absorbentare studied on the activity for the absorption of SO₂ andNO and on the structure of the absorbent.The activity for the absorption of SO₂ and NO markedlyincreased with the content of silica inthe absorbent up to 40%. The formation of calcium silicate issuggested to be predominant ina high concentration of silica, while the formation of ettringite wasobserved by the XRD onlyfor the absorbent containing silica below 30%. The distributionof the sulfur and nitrogencompounds in the absorbent revealed by XPS suggests that adsorbednitrogen compounds aregradually replaced by sulfur compounds as the reactionproceeds.