Preparation of ultramicroporous carbon for gas adsorption through oxygen-rich precursor-enhanced chemical activation

作者：Jingyu Li, Xiaoxiao Meng, Wei Zhou, Yulin Feng, Junfeng Li, Naiyuan Xue, Liang Xie, Zheyu Liu, Jihui Gao, Fei Sun, Guangbo Zhao · 发表于：Environmental Research · 年份：2025 · DOI：10.1016/j.envres.2025.121573 · 被引用次数：6 · 研究领域：Catalytic Processes in Materials Science、Mesoporous Materials and Catalysis、Zeolite Catalysis and Synthesis

The creation of ultramicroporous carbon with highly developed pore structures for CO 2 adsorption is a promising approach to addressing the challenges posed by CO 2 emissions. However, traditional activation methods often struggle with controlling pore development, making it difficult for porous carbon to achieve both high ultramicroporosity and a substantial specific surface area ( S BET ), simultaneously. Herein, we introduce a scalable strategy that utilizes oxygen-rich precursors to enhance chemical activation, allowing for precise regulation of ultramicropores while ensuring sufficient pore development. Preoxidation in air results in a loose carbon structure , abundant active sites (oxygen-functional groups), and well-formed initial pores in the precursor. These features effectively facilitate the distribution of the activator and the etching of the carbon matrix, leading to the formation of new pores in the porous carbon . The ultramicropores measuring 0.65–0.7 nm in the porous carbon are selectively enhanced, with their volume increasing from 0.12 cm 3 /g to 0.26 cm 3 /g. Thanks to the high microporosity (84.27 %–91.07 %) and substantial S BET (1589–2760 m 2 /g), the ultramicroporous carbon prepared through this strategy demonstrates impressive CO 2 uptake of 4.26 mmol/g (298 K, 1 bar) and 6.79 mmol/g (273 K, 1 bar), along with favorable regeneration economy ( Q st of 37.33 kJ/mol) and high CO 2 /N 2 selectivity ( S ads of 56). This research offers valuable insights in...