In order to develop a catalyst with high activity for catalytic wet oxidation (CWO) process at room temperature and atmospheric pressure, Fe2O3-CeO2-TiO2/γ-Al2O3 catalyst was prepared by consecutive impregnation me...In order to develop a catalyst with high activity for catalytic wet oxidation (CWO) process at room temperature and atmospheric pressure, Fe2O3-CeO2-TiO2/γ-Al2O3 catalyst was prepared by consecutive impregnation method and the prepared parameters were optimized. The structure of the catalyst was characterized by BET, XRF, SEM and XPS technologies, and the actual wastewater was used to investigate the catalytic activity of Fe2O3-CeO2-TiO2/γ-Al2O3 in CWO process. The experimental results showed that the prepared catalyst exhibited good catalytic activity when the doping amount of Ti was 1.0 wt% (the weight ratio of Ti to carriers), and the middle product, Fe2O3-CeO2-TiO2/γ-Al2O3, was calcined in 450℃ for 2 h. The CWO experiment for treating actual dye wastewater indicated that the COD, color and TOC of actual wastewater were decreased by 62.23%, 50.12% and 41.26% in 3 h, respectively, and the ratio of BOD5/COD was increased from 0.19 to 0.30.展开更多
超细颗粒物为大气中痕量气态污染物转化提供了广泛的反应界面,在其表面发生多相界面反应是大气二次颗粒物形成的主要途径。含铁超细颗粒是大气气溶胶的主要成分之一。本研究采用同步辐射X射线近边吸收谱(X-ray Absorption Near Edge Str...超细颗粒物为大气中痕量气态污染物转化提供了广泛的反应界面,在其表面发生多相界面反应是大气二次颗粒物形成的主要途径。含铁超细颗粒是大气气溶胶的主要成分之一。本研究采用同步辐射X射线近边吸收谱(X-ray Absorption Near Edge Structure,XANES)技术开展了Fe_3O_4超细颗粒表面的多相反应研究,分析了反应时间、紫外照射及臭氧存在条件对二次颗粒物形成的影响。研究发现:SO_2在Fe_3O_4超细颗粒表面能被快速氧化形成硫酸根(SO_42-),其中紫外光照(Ultra-Violet,UV)和O_3可以促进硫酸根的生成。从反应时间上看,SO_2在Fe_3O_4超细颗粒表面可快速反应生成高价态硫酸根,30 min时,约99%的硫化物转化成硫酸根。通过对S的XANES谱进行一阶导数处理,发现产物中还存在亚硫酸根(SO_32-)的峰,提示SO_2在Fe_3O_4颗粒物表面可先生成亚硫酸根,进而被快速氧化成硫酸根。展开更多
基金The National Basic Research Program (973) of China (No. 2004CB418505) the Foundation for Excellent Youth of HeilongjiangProvince
摘要In order to develop a catalyst with high activity for catalytic wet oxidation (CWO) process at room temperature and atmospheric pressure, Fe2O3-CeO2-TiO2/γ-Al2O3 catalyst was prepared by consecutive impregnation method and the prepared parameters were optimized. The structure of the catalyst was characterized by BET, XRF, SEM and XPS technologies, and the actual wastewater was used to investigate the catalytic activity of Fe2O3-CeO2-TiO2/γ-Al2O3 in CWO process. The experimental results showed that the prepared catalyst exhibited good catalytic activity when the doping amount of Ti was 1.0 wt% (the weight ratio of Ti to carriers), and the middle product, Fe2O3-CeO2-TiO2/γ-Al2O3, was calcined in 450℃ for 2 h. The CWO experiment for treating actual dye wastewater indicated that the COD, color and TOC of actual wastewater were decreased by 62.23%, 50.12% and 41.26% in 3 h, respectively, and the ratio of BOD5/COD was increased from 0.19 to 0.30.