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Synthesis of MnO2 modified porous carbon spheres by preoxidation-assisted impregnation for catalytic oxidation of indoor formaldehyde
- Source :
- Journal of Porous Materials. 27:801-815
- Publication Year :
- 2020
- Publisher :
- Springer Science and Business Media LLC, 2020.
-
Abstract
- 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.
- Subjects :
- Materials science
Scanning electron microscope
Mechanical Engineering
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Catalysis
Adsorption
X-ray photoelectron spectroscopy
Chemical engineering
Catalytic oxidation
Mechanics of Materials
Desorption
General Materials Science
Fourier transform infrared spectroscopy
Temperature-programmed reduction
0210 nano-technology
Subjects
Details
- ISSN :
- 15734854 and 13802224
- Volume :
- 27
- Database :
- OpenAIRE
- Journal :
- Journal of Porous Materials
- Accession number :
- edsair.doi...........fdbc335210c4bd319460daa884b4611b