کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
59003 | 1419445 | 2014 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The effects of Mn loading on the structure and ozone decomposition activity of MnOx supported on activated carbon The effects of Mn loading on the structure and ozone decomposition activity of MnOx supported on activated carbon](/preview/png/59003.png)
Manganese oxide catalysts supported on activated carbon (AC, MnOx/AC) for ozone decomposition were prepared by in situ reduction of the permanganate. The morphology, oxidation state, and crystal phase of the supported manganese oxide were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, electron spin resonance, Raman spectroscopy, and temperature-programmed reduction. The supported MnOx layer was distributed on the surface of AC with a morphology that changed from a porous lichen-like structure to stacked nanospheres, and the thickness of the MnOx layer increased from 180 nm to 710 nm when the Mn loading was increased from 0.44% to 11%. The crystal phase changed from poorly crystalline β-MnOOH to δ-MnO2 with the oxidation state of Mn increasing from +2.9–+3.1 to +3.7–+3.8. The activity for the decomposition of low concentration ozone at room temperature was related to the morphology and loading of the supported MnOx. The 1.1%MnOx/AC showed the best performance, which was due to its porous lichen-like structure and relatively high Mn loading, while 11%MnOx/AC with the thickest MnOx layer had the lowest activity owning to its compact morphology.
Graphical AbstractThe 1.1% MnOx/AC (AC: activated carbon) catalyst gave the highest activity for ozone decomposition, which was mainly due to its porous structure, while 11% MnOx/AC with the thickest MnOx layer showed the lowest activity because of its compact morphologyFigure optionsDownload as PowerPoint slide
Journal: Chinese Journal of Catalysis - Volume 35, Issue 3, March 2014, Pages 335–341