K<sub>2</sub>CO<sub>3</sub>改性类水滑石衍生复合金属氧化物吸附剂脱除HCl(g)性能

王统伟; 金保昇; 吴畏; 谷沁洋; 汪德成

doi:10.13205/j.hjgc.202109015

K₂CO₃改性类水滑石衍生复合金属氧化物吸附剂脱除HCl(g)性能

doi: 10.13205/j.hjgc.202109015

1. 东南大学能源与环境学院能源热转换及其过程测控教育部重点实验室, 南京 210096;
2. 南京环境集团有限公司, 南京 210026

基金项目:

国家重点研发计划项目（2018YFC1901200）。

详细信息

作者简介:
王统伟(1996-),男,硕士,主要研究方向为烟气中污染物控制。tongweiwang@seu.edu.cn

通讯作者:
金保昇(1961-),教授,博士生导师,主要研究方向为煤与生物质发电技术及其相关的气固流动与热质传递。bsjin@seu.edu.cn

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出版历程
- 收稿日期: 2020-12-16
- 网络出版日期: 2022-01-21

HCl(g) REMOVAL PERFORMANCE OF K₂CO₃-MODIFIED CAMGAL MIXED METAL OXIDES DERIVED FROM HYDROTALCITE-LIKE

1. Key Laboratory of Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China;
2. Nanjing Environment Group Co., Ltd, Nanjing 210026, China

摘要

摘要: 采用浸渍法对钙镁铝类水滑石进行K₂CO₃改性，并进一步焙烧获得复合金属氧化物吸附剂。在固定床实验系统上对K₂CO₃改性类水滑石吸附剂的高温脱除HCl（g）性能进行了研究，探究了K₂CO₃负载量、反应温度和初始HCl（g）浓度对其高温脱除HCl（g）性能的影响，通过X射线衍射（XRD）、比表面积及孔隙分析（BET）、扫描电镜（SEM）及热重分析（TG）对改性前后的类水滑石吸附剂进行了表征。结果表明：1）K₂CO₃改性后类水滑石吸附剂的脱除HCl（g）性能显著提高，K₂CO₃的最佳负载量为30%，过高的负载量会导致吸附剂的孔隙堵塞，吸附能力下降；2）在400~800℃的反应温度范围内，吸附剂的HCl（g）吸附容量在600℃时达到最高，为0.289 g/g；3）在不同HCl（g）浓度下吸附剂的脱除HCl（g）性能保持稳定；4）经500℃煅烧后吸附剂的比表面积和孔体积增大，平均孔径减小，吸附能力增强；负载K₂CO₃后类水滑石吸附剂的热稳定性有所增强。K₂CO₃改性后的类水滑石衍生吸附剂具有优良的高温脱除HCl（g）性能，为选择高效实用的高温HCl（g）吸附剂提供了参考。
- 类水滑石 /
- 碳酸钾 /
- 脱除 /
- HCl(g) /
- 吸附剂 /
- 固定床
Abstract: In this paper, the Ca-Mg-Al hydrotalcite-like was impregnated by K₂CO₃, and the derived mixed metal oxide adsorbent was obtained by further calcination. The fixed-bed experimental system was used to study the HCl(g) removal performance of K₂CO₃ modified hydrotalcite-like adsorbent at high temperature. The effects of K₂CO₃ content, reaction temperature and HCl(g) concentration on the removal of HCl(g) were investigated. The adsorbents were characterized by X-ray diffraction, specific surface area and pore analysis, scanning electron microscopy and thermogravimetric analysis. The results showed that:HCl(g) removal performance of hydrotalcite-like adsorbent modified by K₂CO₃ was significantly improved, and the optimum K₂CO₃ content was 30%. When the K₂CO₃ content exceeded 30%, the pore of adsorbent was blocked and the adsorption capacity was decreased. In the reaction temperature range of 400~800℃, the HCl(g) adsorption capacity of the adsorbent reached the maximum value of 0.289 g/g adsorbent at 600℃. After being calcined at 500℃, the specific surface area and pore volume of the adsorbent increased, the average pore size decreased, and the adsorption capacity was enhanced. The thermal stability of the hydrotalcite-like adsorbent was improved after impregnated by K₂CO₃. The high-temperature HCl(g) removal performance of K₂CO₃ modified hydrotalcite-like adsorbent was excellent, providing research directions for finding efficient and practical high-temperature HCl(g) removal adsorbents.
- hydrotalcite-like /
- potassium carbonate(K₂CO₃) /
- removal /
- HCl(g) adsorbents /
- fixed-bed /

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