炭纳米纤维在接近室温下对低浓度NO的催化氧化

Catalytic oxidation of NO at low concentrations by carbon nanofibers near room temperature

摘要: 采用聚丙烯腈 (PAN)作为静电纺丝前驱体，通过静电纺丝法制备了炭纳米纤维，经预氧化和炭化处理，得到了孔隙率高、比表面积大的PAN基炭纳米纤维 (PCNFs)。通过控制前驱体溶液的浓度，可以得到不同直径的PCNFs。制备的样品在室温 (20 °C)下能去除低浓度的NO (5×10⁻⁵)。结果表明，炭纳米纤维的微观结构可以影响其对NO的催化性能。CNFs直径越小，微孔越发达，比表面积越大，吸附和催化氧化效果越好。

Abstract: Polyacrylonitrile (PAN) nanofibers obtained by electrospinning were used to prepare PAN-based carbon nanofibers (PCNFs) by pre-oxidation, carbonization and high-temperature treatment in NH₃. The PCNFs were used for the removal of low concentrations of NO (5×10⁻⁵) near room temperature (20 °C) by catalytic oxidation. Results indicated that the PCNFs had high porosity and a large specific surface area, and their diameters could be regulated by changing the PAN concentration. The smaller the diameter of the PCNFs the more micropores were developed, and the larger the specific surface area the better the adsorption and catalytic oxidation performance.