从烟气中使用基于Ca的吸附剂去除的机制的洞察力
Aijia Zhang1, Jing Liu1, Yingju Yang1
1State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
The Science of the total environment
|December 4, 2023
概括
新的基吸附剂有效捕获焚烧烟气中的有毒. CA-CaO表现出卓越的性能,在1000°C时达到94.79%的去除效率.
科学领域:
- 环境科学 环境科学
- 化学工程是化学工程的重要组成部分.
- 材料科学 材料科学 材料科学
背景情况:
- 是污水污泥焚烧烟气中的有毒污染物.
- 由于其毒性和可变的价值,有效去除 (Cr) 是具有挑战性的.
- 传统的氧化 (CaO) 在Cr捕获效率方面存在局限性.
研究的目的:
- 开发和评估新的基于的吸附剂,用于从烟气中捕获.
- 研究Cr吸附性能和修改的CaO吸附剂的机制.
- 评估烟气成分对Cr吸附过程的影响.
主要方法:
- 通过化盐合成基于Ca的吸附剂 (CG-CaO,CA-CaO,CCi-CaO).
- 使用X射线衍射 (XRD) 和X射线光电谱 (XPS) 评估Cr去除效率.
- 使用四种标准模型分析吸附动力学,并评估竞争性吸附效应.
主要成果:
- 改性吸附剂 (CG-CaO,CA-CaO,CCi-CaO) 与传统的CaO相比,显示出增强的Cr去除.
- 由于表面积和孔积较大,CA-CaO具有最高的吸附能力 (104.52 mg/g) 和效率 (94.79%在1000°C).
- 吸附包括化学吸附和粒子内部扩散,形成CaCr2O4和CaCrO4.
- 由于竞争性吸附,二氧化硫 (SO2) 显著抑制了Cr吸附.
结论:
- 开发的基于Ca的吸附剂,特别是CA-CaO,为从焚烧烟气中去除提供了一个有前途的解决方案.
- 吸附机制复杂,涉及物理吸附和化学反应.
- 像SO2这样的烟气成分可能会对吸附剂效率产生负面影响,需要进一步优化.
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