Removal of elemental mercury from coal combustion flue gas by sodium halides impregnated red mud

Q3 Energy 燃料化学学报 Pub Date : 2025-01-01 Epub Date: 2025-01-20 DOI:10.1016/S1872-5813(24)60501-3

Sarfraz MUHAMMAD, Yang LI, He YANG, Lijun JIN, Dekang LI, Haoquan HU

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Abstract

Mercury removal from coal combustion flue gas remains a significant challenge for environmental protection due to the lack of cost-effective sorbents. In this study, a series of red mud (RM)-based sorbents impregnated with sodium halides (NaBr and NaI) are presented to capture elemental mercury (Hg⁰) from flue gas. The modified RM underwent comprehensive characterization, including analysis of its textural qualities, crystal structure, chemical composition, and thermal properties. The results indicate that the halide impregnation substantially impacts the surface area and pore size of the RM. Hg⁰ removal performance was evaluated on a fixed-bed reactor in simulated flue gas (consisting of N₂, O₂, CO₂, NO and SO₂, etc.) on a modified RM. At an optimal adsorption temperature of 160 °C, NaI-modified sorbent (RMI5) offers a removal efficiency of 98% in a mixture of gas, including O₂, NO and HCl. Furthermore, pseudo-second-order model fitting results demonstrate the chemisorption mechanism for the adsorption of Hg⁰ in kinetic investigations.

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卤化钠浸渍赤泥法去除燃煤烟气中单质汞

由于缺乏具有成本效益的吸附剂，从燃煤烟气中去除汞仍然是环境保护的一个重大挑战。在本研究中，提出了一系列浸渍卤化钠（NaBr和NaI）的赤泥（RM）基吸附剂，用于捕获烟气中的单质汞（Hg0）。对改性后的RM进行了全面的表征，包括对其质地、晶体结构、化学成分和热性能的分析。结果表明，卤化物浸渍对复合材料的表面积和孔径有较大影响。在固定床反应器上对改性RM上模拟烟气（N2、O2、CO2、NO和SO2等）中的Hg0去除性能进行了评价。在160℃的最佳吸附温度下，nai改性吸附剂（RMI5）对O2、NO和HCl等混合气体的去除率可达98%。在动力学研究中，拟二阶模型拟合结果证明了Hg0吸附的化学吸附机理。

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来源期刊

燃料化学学报 Chemical Engineering-Chemical Engineering (all)

CiteScore

2.80

自引率

0.00%

发文量

5825

期刊介绍： Journal of Fuel Chemistry and Technology (Ranliao Huaxue Xuebao) is a Chinese Academy of Sciences(CAS) journal started in 1956, sponsored by the Chinese Chemical Society and the Institute of Coal Chemistry, Chinese Academy of Sciences(CAS). The journal is published bimonthly by Science Press in China and widely distributed in about 20 countries. Journal of Fuel Chemistry and Technology publishes reports of both basic and applied research in the chemistry and chemical engineering of many energy sources, including that involved in the nature, processing and utilization of coal, petroleum, oil shale, natural gas, biomass and synfuels, as well as related subjects of increasing interest such as C1 chemistry, pollutions control and new catalytic materials. Types of publications include original research articles, short communications, research notes and reviews. Both domestic and international contributors are welcome. Manuscripts written in Chinese or English will be accepted. Additional English titles, abstracts and key words should be included in Chinese manuscripts. All manuscripts are subject to critical review by the editorial committee, which is composed of about 10 foreign and 50 Chinese experts in fuel science. Journal of Fuel Chemistry and Technology has been a source of primary research work in fuel chemistry as a Chinese core scientific periodical.