Understanding the Catalyst Regeneration Kinetics in the Chelated Iron Dehydrosulfurization Process: A Model in Terms of Fe(II) Speciation

详细信息    查看全文

• 作者：Lin-Feng Zhai ; Li-Li Hu ; Min Sun
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：July 1, 2015
• 年：2015
• 卷：54
• 期：25
• 页码：6430-6437
• 全文大小：498K
• ISSN：1520-5045

文摘

Chelated iron dehydrosulfurization process is among the most promising techniques for sulfur recovery from hydrogen sulfide waste. The oxidation of ferrous iron (Fe(II)) plays a crucial role in determining the efficiency of chelated iron process. This work aims to develop a model that describes the electrochemical and aerobic oxidation kinetics of Fe(II) in terms of Fe(II) speciation. By using such a kinetic model, the oxidation behavior of Fe(II) as a function of solution pH and solution composition is appropriately interpreted in the chelated iron process. The oxidation rate of Fe(II) in the EDTA-chelated iron process is mainly controlled by the Fe(EDTA)^{2鈥?/sup> and Fe(OH)(EDTA)3鈥?/sup>species, wheras the Fe(NTA)鈭?/sup> and Fe(NTA)₂4鈥?/sup> species are the dominant species responsible for the oxidation kinetics of Fe(II) in NTA-chelated iron process. It is anticipated that the kinetic model developed in this work will provide valuable information for a better understanding and manipulation of the chelated iron process.}