湿度对氨基功能化的微孔活性碳增强的CO2吸附的影响
Masoumeh Lotfinezhad1, Maryam Tahmasebpoor2, Covadonga Pevida3
1Faculty of Chemical & Petroleum Engineering, University of Tabriz, Tabriz, Iran.
Environmental science and pollution research international
|November 16, 2024
概括
这项研究开发了用于捕获二氧化碳的活性碳 (AC) 吸附剂. 虽然原始AC显示出更高的CO2吸附率,但因水辅助化学吸附,胺浸的AC在潮湿条件下表现更好.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 环境科学 环境科学
背景情况:
- 开发具有成本效益和环保的吸附剂对于二氧化碳 (CO2) 捕获至关重要.
- 微孔活性炭 (AC) 材料具有吸附二氧化碳的潜力.
- 胺基功能化是提高二氧化碳捕获能力的共同策略.
研究的目的:
- 通过将单乙醇胺 (MEA) 和四乙烯胺 (TEPA) 纳入活性炭,合成和表征新型二氧化碳吸附剂.
- 在各种条件下评估原始和胺浸AC的二氧化碳吸附性能.
- 研究水蒸气对开发的吸附剂二氧化碳捕获效率的影响.
主要方法:
- 活性炭 (AC) 使用KOH进行了修改,以提高表面积和孔径.
- 在AC材料上浸了MEA和TEPA.
- 使用BET,SEM,EDX和FTIR技术分析了结构和表面特性.
- 在不同温度,二氧化碳度和湿度水平下,使用热重力测量分析 (TGA) 评估了CO2吸附性能.
主要成果:
- 原始AC表现出最高的表面积 (786 m2/g) 和微孔体积 (0.33 cm3/g).
- 胺浸增加了含量,但减少了BET表面积和毛孔体积.
- 与MEA-AC (0.5 mmol/g) 和TEPA-AC (0.3 mmol/g) 相比,原始的AC显示出更高的CO2吸附率 (1.2 mmol/g在25°C,1 bar) 与MEA-AC (0.5 mmol/g) 相比.
- 在潮湿的条件下 (50°C,10%的CO2,4%的H2O),MEA-AC和TEPA-AC由于促进化学吸收,显著增加了CO2吸收 (7-13 mmol/g).
结论:
- 胺浸的活性炭对二氧化碳捕获有前途,特别是在水蒸气存在的情况下.
- 水促进化学吸收,提高了MEA-AC和TEPA-AC在潮湿烟气中的二氧化碳吸附能力.
- 开发的吸附剂为二氧化碳捕获技术提供了潜在的成本效益和环保的解决方案.
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