Resin-based porous carbon spheres with well dispersed MnO₂ particles were sucessfully synthesised by steam activation and preoxidation-assisted impregnation of manganese nitrate salt. X-ray diffractometer (XRD), Fourier Transform Infrared spectroscopy (FT-IR), N₂ adsorption–desorption, scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), H₂ temperature programmed reduction (H₂-TPR), O₂ temperature-programmed desorption (O₂-TPD) and in-situ diffuse reflectance fourier transform spectrometry (DRIFTS) were applied to characterize the obtained porous carbon spheres, and the HCHO adsorption and stability performances were evaluated in a fixed bed reactor. The results demonstrated that surface chemical properties and HCHO removal performances were significantly enhanced after the modification of preoxidation-assisted impregnation. The optimal manganese nitrate loading value, and relative humidity were 6 and 50%, respectively. Moreover, the higher HCHO concentration showed a smaller breakthrough time. The HCHO removal efficiency of ACS–O-6% Mn remained 100% even after reaction for 20 h at room temperature, while the average HCHO removal efficiency only declines by 0.2% compared with the first adsorption after 10 regeneration cycles. The in-situ DRIFTS results showed the smaller accumulation and faster desorption of intermediate products over the ACS–O-6% Mn. The HCHO removal mechanism analysis indicated that the enriched Mn³⁺ and surface active chemisorbed oxygen accounted for the excellent catalytic oxidation activity and stability.

通过蒸汽活化和硝酸锰盐的预氧化辅助浸渍，成功地合成了具有良好分散的MnO ₂颗粒的树脂基多孔碳球。X射线衍射仪（XRD），傅立叶变换红外光谱（FT-IR），N ₂吸附-解吸，扫描电子显微镜（SEM），能量色散光谱（EDS），X射线光电子能谱（XPS），H ₂温度程序还原（H ₂ -TPR），O ₂温度程序解吸（O ₂-TPD）和原位漫反射傅里叶变换光谱（DRIFTS）用于表征获得的多孔碳球，并在固定床反应器中评估HCHO的吸附和稳定性能。结果表明，预氧化辅助浸渍改性后，表面化学性质和HCHO去除性能得到显着提高。最佳硝酸锰负载量和相对湿度分别为6％和50％。此外，较高的HCHO浓度显示较短的穿透时间。即使在室温下反应20小时后，ACS–O-6％Mn的HCHO去除效率仍保持100％，而与10个再生循环后的首次吸附相比，平均HCHO去除效率仅下降了0.2％。原位DRIFTS结果表明，中间产物在ACS–O–6％Mn上的积聚较小，并且解吸速度更快。HCHO去除机理分析表明富锰³⁺和表面活性化学吸附的氧具有出色的催化氧化活性和稳定性。