Effective purification of low concentration SO₂ at cathode air stream side is essential for Proton exchange membrane fuel cells performance in the real-world application. Amino modification porous material is the effective purification media. The modifier distribution along the pore channels is one of the most influencing parameters that determine the purification performance. Amino-modified porous resins are synthesized to assess the mechanism of modifier distribution along the pore channel. Modifier concentration, modification time, modification temperature, and intersolubility between solvent and modifier are found to significantly affect the modifier distribution. Increased modifier concentration within a relatively low range (0–200 g/L) is favorable to grafting modifier in external pore channel. However, no more significant modifier grafting was found for higher modifier concentration due to the higher solvent viscosity and lower modifier diffusion. Increased modification time leads to more amino groups grafted in deep pore channel. However, after the modification time is longer than 6 h, the modifier no longer diffuses into deeper pore channel due to the diffusion limitation. Solvent property significantly affects the modifier solubility and the swelling degree of porous resin. Larger intersolubility between solvent and modifier enhances the modifier diffusion into pore channel.

有效净化低浓度SO ₂在实际应用中，阴极空气流侧对于质子交换膜燃料电池的性能至关重要。氨基改性多孔材料是有效的纯化介质。改性剂沿孔道的分布是影响纯化性能的最重要参数之一。合成了氨基改性的多孔树脂，以评估改性剂沿孔道分布的机理。发现改性剂浓度，改性时间，改性温度以及溶剂与改性剂之间的互溶性显着影响改性剂的分布。在相对较低的范围内（0-200 g / L）增加改性剂浓度有利于在外部孔道中接枝改性剂。然而，由于较高的溶剂粘度和较低的改性剂扩散，对于较高的改性剂浓度，未发现更明显的改性剂接枝。延长的修饰时间导致在深孔通道中接枝更多的氨基。但是，在改性时间超过6小时之后，由于扩散限制，改性剂不再扩散到更深的孔道中。溶剂性质显着影响改性剂的溶解度和多孔树脂的溶胀度。溶剂和改性剂之间较大的互溶性可提高改性剂向孔道中的扩散。由于扩散限制，改性剂不再扩散到更深的孔道中。溶剂性质显着影响改性剂的溶解度和多孔树脂的溶胀度。溶剂和改性剂之间较大的互溶性可提高改性剂向孔道中的扩散。由于扩散限制，改性剂不再扩散到更深的孔道中。溶剂性质显着影响改性剂的溶解度和多孔树脂的溶胀度。溶剂和改性剂之间较大的互溶性可提高改性剂向孔道中的扩散。