Preparation of Fe/activated carbon directly from rice husk pyrolytic carbon and its application in catalytic hydroxylation of phenol

作者：Zhang, Xian^*; Li, Yaxin; Li, Guiying; Hu, Changwei

来源：RSC Advances, 2015, 5(7): 4984-4992.

DOI：10.1039/c4ra13248c

• OXIDE THIN-FILMS
• ACTIVATED CARBON
• SPRAY-PYROLYSIS
• OXIDATION
• MECHANISM
• BENZENE
• SILICA

Rice husk pyrolytic carbon (PC) was pretreated by NaOH solution at 100 degrees C for 5 h to remove SiO2 and then used to prepare Fe/activated carbon catalyst. The treated sample was impregnated with ferric nitrate solution, and then activated under N-2 atmosphere, obtaining Fe/activated carbon catalysts. The samples were characterized by temperature programed decomposition-mass spectra (TPD-MS), Brauner-Emmett-Teller (BET), inductively coupled plasma atomic emission spectrometry (ICP-AES), scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The specific surface area increased with activation temperature until 750 degrees C. With the increase of iron content, the specific surface area of carbon increased first up to 0.39 mmol g(-1) iron loaded and then decreased. Reactive decomposition of ferric nitrate happened at 120-350 degrees C releasing NO and CO2. Part of ferric (Fe(III)) species was reduced to ferrous (Fe(II)) species forming Fe3O4 at 400-550 degrees C, and metal Fe at 650-750 degrees C. The Fe/activated carbon exhibited high activity and selectivity for phenol hydroxylation.

• 出版日期2015
• 单位四川大学