Middle-Low-temperature Flue Gas Arsenic Removal and Sulfur Resistance Performance of FeCeLaO/Fly Ash-based SiO2-Al2O3

WANG Kai; ZHANG Kaihua; ZHANG Kai

doi:10.19805/j.cnki.jcspe.2025.240039

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Middle-Low-temperature Flue Gas Arsenic Removal and Sulfur Resistance Performance of FeCeLaO/Fly Ash-based SiO₂-Al₂O₃

更新时间：2025-11-28

- Middle-Low-temperature Flue Gas Arsenic Removal and Sulfur Resistance Performance of FeCeLaO/Fly Ash-based SiO₂-Al₂O₃
- Chinese Journal of Power Engineering Vol. 45, Issue 4, Pages: 602-611(2025)
- 作者机构：
  
  华北电力大学热电生产过程污染物监测与控制北京市重点实验室,北京,102206
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2025.240039
  CLC： X773
- Published Online：28 April 2025，
  
  Published：2025
- 稿件说明：
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王凯,张凯华,张锴. FeCeLaO/粉煤灰基SiO₂-Al₂O₃中低温烟气脱砷及抗硫性能动力工程学报, 2025, 45(4): 602-611 https://doi.

org/10.19805/j.cnki.jcspe.2025.240039
王凯,张凯华,张锴. FeCeLaO/粉煤灰基SiO₂-Al₂O₃中低温烟气脱砷及抗硫性能动力工程学报, 2025, 45(4): 602-611 https://doi. DOI： 10.19805/j.cnki.jcspe.2025.240039.

org/10.19805/j.cnki.jcspe.2025.240039 DOI：

摘要

采用碱熔-酸洗法对粉煤灰表面进行改性

制备活性Si-Al载体

同时以Fe、Ce、La复合氧化物为活性组分

采用共沉淀法制备FeCeLaO/活性Si-Al载体复合吸附剂

通过X射线荧光光谱、比表面积测定、X射线衍射图谱等对吸附剂进行表征

进而研究温度、Si/Al质量分数比、FeCeLaO负载率对复合吸附剂脱砷和抗硫中毒能力的影响。结果表明:活性Si-Al载体的脱砷能力随Si/Al质量分数比的增大和吸附温度的升高均先升高后降低

最佳Si/Al质量分数比为1.85

此时脱砷效率最高为78.7%

为原灰的2.8倍;最佳吸附温度位于高温段600 ℃

此时脱砷效率为84.8%;而FeCeLaO/活性Si-Al载体复合吸附剂最佳吸附温度位于中低温段400 ℃

脱砷效率高达96.9%

活性组分最佳负载率为1∶1。活性Si-Al载体的抗硫中毒能力随Si/Al质量分数比的增大而增强;引入FeCeLaO活性组分

有利于增强吸附剂的抗硫中毒能力

且负载率越高

抗硫中毒能力越强;FeCeLaO/活性Si-Al氧化物抗硫中毒能力强的原因主要是SiO

的表面酸性和Ce元素对Fe、La、Al等活性组分的保护效应。

Abstract

The surface of fly ash was modified using an alkali fusion-acid washing method to prepare an active Si-Al carrier. And Fe

La composite oxides were used as the active components to prepare FeCeLaO/active Si-Al carrier composite adsorbent by co-precipitation method. The adsorbents were characterized by X-ray fluorescence spectroscopy (XRF)

specific surface area measurements

and X-ra

y diffraction (XRD) patterns. Effects of temperature

Si/Al mass ratio

FeCeLaO loading ratio on arsenic removal efficiency and sulfur poisoning resistance of the composite adsorbent were investigated. Results show that the arsenic removal capacity of active Si-Al carrier increases first and then decreases with the increase of Si/Al mass ratio and adsorption temperature. The optimal Si/Al mass fraction ratio is 1.85

achieved a maximum arsenic removal efficiency of 78.7%

which is 2.8 times higher than that of raw fly ash. The highest removal efficiency of 84.8% is located in the high temperature range of 600 ℃. The best adsorption temperature of FeCeLaO/active Si-Al carrier composite adsorbent is located in the middle and low temperature section of 400 ℃

the arsenic removal efficiency is as high as 96.9%

and the best loading ratio of active components is 1∶1. The anti-sulfur poisoning ability of active Si-Al carriers is enhanced with the increase Si/Al mass fraction ratio. The introduction of FeCeLaO active component is conducive to the enhancement of the antisulfur poisoning ability of the adsorbent

and the higher the loading ratio

the stronger the anti-sulfur poisoning ability. The reason for the strong anti-sulfur poisoning ability of FeCeLaO/active Si-Al oxides is mainly due to the surface acidity of SiO

and the protective effect of elemental Ce on the active components

such as Fe

etc.

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