湿法催化氧化升级回收半干法烟气脱硫灰分为可持续石膏

IF 4.1 2区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

iScience Pub Date : 2025-09-07 DOI:10.1016/j.isci.2025.113476

Hao-Qin Xiong , Jia-Zhuo Qu , Zhe-Xi Luan , Xiao-Long Sun , Xiang-Yang Mei

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引用次数: 0

摘要

半干法烟气脱硫灰分（SFGDA）富含亚硫酸钙（CaSO3），且碱性强，由于其不稳定且氧化缓慢，对直接回用提出了挑战。本文综述了湿式催化氧化（WCO）将CaSO3转化为建筑级硫酸钙（CaSO4）的最新进展。我们构建了均相和非均相自由基链路径和晶格缺陷激活，强调了Mn/Co/Fe氧化还原循环和氧空位工程如何加速转化。对传统盐、金属有机骨架（MOFs）、钙钛矿和纳米结构催化剂的性能进行了比较，其中Co-MOFs在3小时内氧化率达到96%，而MnTiO3的活化能降低了40%。超声波辅助纳米气泡、微尺度传质强化和pH控制在5-6的工艺优化解决了扩散和碱性限制，而层状双氢氧化物和防结垢表面减轻了氯化物中毒和污染。通过将机制见解与技术进步相结合，本工作为SFGDA管理规划了一条可持续的途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Wet catalytic oxidation upcycling semi-dry flue gas desulfurization ash to sustainable gypsum

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Wet catalytic oxidation upcycling semi-dry flue gas desulfurization ash to sustainable gypsum

Semi-dry flue gas desulfurization ash (SFGDA), rich in calcium sulfite (CaSO₃) and highly alkaline, poses challenges for direct reuse due to its instability and slow oxidation. This review synthesizes recent advances in wet catalytic oxidation (WCO) that transform CaSO₃ into construction-grade calcium sulfate (CaSO₄). We frame homogeneous and heterogeneous radical-chain routes and lattice-defect activation, underscoring how Mn/Co/Fe redox cycles and oxygen-vacancy engineering accelerate conversion. Performance comparisons span conventional salts, metal-organic frameworks (MOFs), perovskites, and nanostructured catalysts, with Co-MOFs achieving 96% oxidation in 3 h and MnTiO₃ lowering activation energy by 40%. Process optimizations ultrasound assisted nanobubbles, micro-scale mass-transfer intensification, and pH control at 5–6 address diffusional and alkaline limitations, while layered double hydroxides and anti-scaling surfaces mitigate chloride poisoning and fouling. By merging mechanistic insights with technological progress, this work maps out a sustainable pathway for SFGDA management.

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来源期刊

iScience Multidisciplinary-Multidisciplinary

CiteScore

7.20

自引率

1.70%

发文量

1972

审稿时长

6 weeks

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