Fe3+增强氢氧化钙固硫效率: 氧化、催化双重机制

doi:10.15541/jim20250348

摘要/Abstract

摘要： 二氧化硫(SO₂)是一种常见的大气污染物, 对环境和人体健康造成严重危害。目前, 氢氧化钙(Ca(OH)₂)作为一种常用的脱硫剂, 因其制备简单、成本低廉且脱硫效果较好而被广泛应用。然而, 如何进一步提高其固硫效率仍是研究重点。本工作通过在氧化钙(CaO)消化过程中加入氢氧化铁(Fe(OH)₃), 分步制备了钙铁脱硫剂, 并研究了其脱硫性能。结果表明, 钙铁脱硫剂的固硫效率显著提高, 与纯Ca(OH)₂相比, 固硫效率最大提升了26.16%。加入Fe³⁺改变了Ca(OH)₂的形貌, 使其表面更加粗糙, 增加了孔隙和裂缝, 从而提供了更多的反应活性位点。此外, 根据X射线光电子能谱测试结果, 脱硫后样品中S⁶⁺的比例从9.71%(纯Ca(OH)₂)提高到33.33%(钙铁脱硫剂), 并且脱硫前钙铁脱硫剂中均是Fe³⁺, 脱硫后Fe²⁺占比68.42%, Fe³⁺占比31.58%, 其中35.56%的硫元素被氧化, 64.44%的硫元素被催化, 说明Fe³⁺的氧化以及催化作用促进了S⁴⁺向S⁶⁺转化, 进一步提高了固硫效率。本工作为提高Ca(OH)₂固硫效率提供了一种有效的方法, 对工业烟气SO₂脱除材料的选择具有重要的借鉴意义。

关键词: 二氧化硫, 氢氧化钙, 钙铁脱硫剂, 固硫效率, 氧化, 催化

Abstract: Sulfur dioxide (SO₂) is a major air pollutant that poses severe hazards to the environment and human health. Currently, calcium hydroxide (Ca(OH)₂) is widely used as a common desulfurizing agent due to its simple preparation process, low cost, and relatively good desulfurization performance. However, further improving its sulfur fixation efficiency remains a key focus of research. In this study, a calcium-iron desulfurizing agent was prepared in a stepwise manner by incorporating ferric hydroxide during the hydration process of calcium oxide (CaO), and its desulfurization performance was systematically investigated. The results demonstrated that sulfur fixation efficiency of the calcium-iron desulfurizing agent was significantly enhanced, showing a 26.16% increase compared to the maximum sulfur fixation efficiency of pure Ca(OH)₂. The addition of Fe³⁺ modified the morphology of Ca(OH)₂, rendering its surface much rougher and increasing the number of pores and cracks. This morphological change provided more active sites for the desulfurization reaction. Furthermore, X-ray photoelectron spectroscopy analysis revealed that the proportion of hexavalent sulfur (S⁶⁺) in the sample after desulfurization increased from 9.71% (pure Ca(OH)₂) to 33.33% (calcium-iron desulfurizing agent). Before desulfurization, all iron in the calcium-iron desulfurizing agent was in the form of Fe³⁺. After desulfurization, Fe²⁺ accounted for 68.42% and Fe³⁺ accounted for 31.58% of the total iron. Calculations based on these data indicated that 35.56% of the sulfur was oxidized, while 64.44% was catalyzed. These findings confirmed that the oxidation and catalytic effects of iron promoted the conversion of tetravalent sulfur (S⁴⁺) to S⁶⁺, thereby further improving the sulfur fixation efficiency. This study provides an effective approach to enhance the sulfur fixation efficiency of Ca(OH)₂ and holds significant reference value for the selection of materials used in the removal of sulfur dioxide from industrial flue gas.

Key words: sulfur dioxide, calcium hydroxide, calcium iron desulfurizer, sulfur fixation efficiency, oxidation, catalysis

中图分类号:

TB321

李中意, 刘彪, 陈茜, 李春忠, 姜海波. Fe³⁺增强氢氧化钙固硫效率: 氧化、催化双重机制[J]. 无机材料学报, DOI: 10.15541/jim20250348.

LI Zhongyi, LIU Biao, CHEN Xi, LI Chunzhong, JIANG Haibo. Enhanced Sulfur Fixation Efficiency of Calcium Hydroxide by Fe³⁺: Dual Mechanisms of Oxidation and Catalysis[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20250348.

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Fe³⁺增强氢氧化钙固硫效率: 氧化、催化双重机制

Enhanced Sulfur Fixation Efficiency of Calcium Hydroxide by Fe³⁺: Dual Mechanisms of Oxidation and Catalysis

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