Preparation of amine-modified coal-based activated carbon and its adsorption performance for formic acid in hydrogen

ZHOU Guanglin; YAN Chaoying; LI Jicong; XUAN Shouguo; JIANG Weili; DANG Jie; HE Haoyi

doi:10.12434/j.issn.2097-2547.20260011

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Preparation of amine-modified coal-based activated carbon and its adsorption performance for formic acid in hydrogen

更新时间：2026-06-29

- Preparation of amine-modified coal-based activated carbon and its adsorption performance for formic acid in hydrogen
- Pages: 1-9(2026)
- 作者机构：
  
  中国石油大学（北京）新能源与材料学院，北京 102249
- 作者简介：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20260011
  CLC： TQ424.1
- Received：08 January 2026，
  
  Revised：2026-03-06，
  
  Online First：29 June 2026，
- 稿件说明：
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周广林,闫超英,李继聪等.胺改性煤质活性炭的制备及其吸附氢气中甲酸的性能研究[J].低碳化学与化工,

ZHOU Guanglin,YAN Chaoying,LI Jicong,et al.Preparation of amine-modified coal-based activated carbon and its adsorption performance for formic acid in hydrogen[J].Low-Carbon Chemistry and Chemical Engineering,
周广林,闫超英,李继聪等.胺改性煤质活性炭的制备及其吸附氢气中甲酸的性能研究[J].低碳化学与化工, DOI：10.12434/j.issn.2097-2547.20260011.

ZHOU Guanglin,YAN Chaoying,LI Jicong,et al.Preparation of amine-modified coal-based activated carbon and its adsorption performance for formic acid in hydrogen[J].Low-Carbon Chemistry and Chemical Engineering, DOI：10.12434/j.issn.2097-2547.20260011.

摘要

高效、低成本深度脱除甲酸分解法制备氢气中的微量甲酸杂质，在甲酸制氢技术的开发中有着重要应用。以工业煤质活性炭为载体，采用浸渍法制备了一系列不同三乙醇胺负载量（质量分数）的吸附剂，利用XRD、N

吸/脱附、FT-IR和元素分析等手段对改性前后煤质活性炭的理化性质进行了表征；研究了三乙醇胺负载量对吸附剂结构、性质及其吸附氢气中甲酸性能的影响，考察了吸附剂循环性能，并结合红外光谱分析了其脱除甲酸的机理。结果表明，不同三乙醇胺负载量制备的改性吸附剂的甲酸吸附容量主要与煤质活性炭比面积、表面含氮官能团有关，比表面积增大有助于活性组分负载，而表面负载三乙醇胺则增强了其化学吸附性能。其中，当三乙醇胺负载量为5%时制备的吸附剂具有较大的表面积（774 m

/g），N元素质量分数从0.25%（煤质活性炭载体）增至0.68%，对氢气中甲酸的吸附性能最佳。在吸附温度为30 ℃，氢气体积空速为1000 h

-1

时，其穿透吸附甲酸容量达701 mg/g，是未改性煤质活性炭吸附容量的5.35倍，经过3次循环再生后，吸附容量保持在694 mg/g。这归因于甲酸与三乙醇胺反应生成三乙醇胺甲酸盐，该反应显著提升了吸附剂吸附甲酸的性能

。本研究为吸附纯化甲酸分解法制备氢气中的微量甲酸杂质提供了一种新策略。

Abstract

Highly efficient and low-cost deep removal of trace formic acid impurities in hydrogen produced by formic acid decomposition has important applications in the development of formic acid hydrogen production technology. A series of adsorbents with different triethanolamine loadings (mass fractions) were prepared by the impregnation method using industrial coal-based activated carbon as the support. The physicochemical properties of the coal-based activated carbon before and after modification were characterized by XRD

adsorption/desorption

FT-IR and elemental analysis. The effects of triethanolamine loading on the structure

properties and adsorption performance of the adsorbents for formic acid in hydrogen were investigated. The cyclic performance of the adsorbents was evaluated

and the mechanism for formic acid removal was analyzed in combination with FT-IR. The results show that the formic acid adsorption capacities of the modified adsorbents prepared with different triethanolamine loadings are mainly related to the specific surface area of the coal-based activated carbon and the nitrogen-containing functional groups on the surface. An increase in specific surface area is beneficial for the loading of active components

while the surface-loaded triethanolamine enhances the chemical adsorption performance. Among them

when the triethanolamine loading is 5%

the prepared adsorbent exhibits a relatively large specific surface area (774 m

/g)

and the mass fraction of N increases from 0.25% (for the coal-based activated carbon support) to 0.68%

showing the best adsorption performance for formic acid in hydrogen. At an adsorption temperature of 30 ℃ and a hydrogen gas hourly space velocity of 1000 h

-1

the breakthrough adsorption capacity for formic acid reaches 701 mg/g

which is 5.35 times that of the unmodified coal-based activated carbon. After three regeneration cy

cles

the adsorption capacity remains at 694 mg/g. This is attributed to the reaction between formic acid and triethanolamine to form triethanolamine formate

which significantly enhances the formic acid adsorption performance of the adsorbent. This study provides a new strategy for the adsorption purification of trace formic acid impurities in hydrogen produced by formic acid decomposition.

关键词

Keywords

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