Effect of CeO2 doping on catalytic activity of Fe2O3/gamma-Al2O(3) catalyst for catalytic wet peroxide oxidation of azo dyes.
In order to find a catalyst with high activity and stability for catalytic wet peroxide oxidation (CWPO) process under normal condition, with Fe(2)O(3)/gamma-Al(2)O(3) and Fe(2)O(3)-CeO(2)/gamma-Al(2)O(3) catalysts prepared by impregnation method, the effect of CeO(2) doping on the structure and catalytic activity of Fe(2)O(3)/gamma-Al(2)O(3) for catalytic wet peroxide oxidation of azo dyes at 25 degrees C and atmospheric pressure is evaluated using BET, SEM, XRF, XRD, XPS and chemical analysis techniques, and test results show that, better dispersion and smaller size of Fe(2)O(3) crystal can be achieved by adding CeO(2), and the content of chemisorbed oxygen can also be increased on the surface of catalyst. CWPO experimental results indicate that azo dyes in simulated wastewater can be efficiently mineralized and the catalytic activity of Fe(2)O(3)-CeO(2)/gamma-Al(2)O(3) can be increased by about 10% compared with that of Fe(2)O(3)/gamma-Al(2)O(3) because of the promotion of the structural and redox properties of the ferric oxide by ceria doped. Leaching tests indicate that Fe(2)O(3)/gamma-Al(2)O(3) and Fe(2)O(3)-CeO(2)/gamma-Al(2)O(3) are stable with a negligible amount of irons found in the aqueous solution after reaction for 2h. It can therefore be concluded from results and discussion that in comparison with Fe(2)O(3)/gamma-Al(2)O(3), Fe(2)O(3)-CeO(2)/gamma-Al(2)O(3) is a suitable catalyst, which can effectively degrade contaminants at normal temperature and atmospheric pressure.
Liu
Yan
Y
School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
Sun
Dezhi
D
D000537:Aluminum Oxide / Q000737:chemistry*; D001391:Azo Compounds / Q000737:chemistry*; D002384:Catalysis; D002563:Cerium / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry; D005290:Ferric Compounds / Q000737:chemistry*; D007220:Industrial Waste; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction; D010545:Peroxides / Q000737:chemistry; D013052:Spectrometry, X-Ray Emission; D013783:Textile Industry; D014865:Waste Disposal, Fluid / Q000379:methods*; D014961:X-Ray Diffraction
D001391:Azo Compounds; D004396:Coloring Agents; D005290:Ferric Compounds; D007220:Industrial Waste; D010545:Peroxides; C000499:ferric oxide; D002563:Cerium; C030583:ceric oxide; D000537:Aluminum Oxide