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煅烧温度对γ-Fe2O3催化剂结构及其脱硝活性的影响

王 栋 张信莉 彭建升 路春美 韩奎华 徐丽婷

王 栋, 张信莉, 彭建升, 路春美, 韩奎华, 徐丽婷. 煅烧温度对γ-Fe2O3催化剂结构及其脱硝活性的影响[J]. 环境科学研究, 2015, 28(5): 808-815.
引用本文: 王 栋, 张信莉, 彭建升, 路春美, 韩奎华, 徐丽婷. 煅烧温度对γ-Fe2O3催化剂结构及其脱硝活性的影响[J]. 环境科学研究, 2015, 28(5): 808-815.
WANG Dong, ZHANG Xinli, PENG Jiansheng, LU Chunmei, HAN Kuihua, XU Liting. Effects of Calcination Temperature on Selective Catalytic Reduction of NOx over γ-Fe2O3 Catalysts Prepared with Microwave Assistance[J]. Research of Environmental Sciences, 2015, 28(5): 808-815.
Citation: WANG Dong, ZHANG Xinli, PENG Jiansheng, LU Chunmei, HAN Kuihua, XU Liting. Effects of Calcination Temperature on Selective Catalytic Reduction of NOx over γ-Fe2O3 Catalysts Prepared with Microwave Assistance[J]. Research of Environmental Sciences, 2015, 28(5): 808-815.

煅烧温度对γ-Fe2O3催化剂结构及其脱硝活性的影响

基金项目: 国家自然科学基金项目(51276101);山东省自然科学基金项目(ZR2012EEM013);高等学校博士学科点专项科研基金项目(20120131110022)

Effects of Calcination Temperature on Selective Catalytic Reduction of NOx over γ-Fe2O3 Catalysts Prepared with Microwave Assistance

  • 摘要: 采用沉淀-微波热解法,以FeSO4·7H2O为铁源制备环境友好的γ-Fe2O3催化剂,结合XRD(X射线衍射)、N2等温吸附-脱附、SEM(扫描电子显微镜)、EDS(能谱仪)等手段对催化剂样品的晶相、孔结构、表面形貌、表面元素组成等进行表征,并考察其NH3-SCR(选择性催化还原)脱硝性能,研究煅烧温度对γ-Fe2O3催化剂物性及NH3-SCR脱硝性能的影响规律. 结果表明:300、350和450 ℃下煅烧制备的催化剂中生成的杂质α-Fe2O3对SCR反应不利,而400 ℃煅烧制备的γ-Fe2O3催化剂脱硝性能最优,NOx转化率最高可达95%以上,XRD结果表明其纯度高,并且在60~100 nm孔径区间具有发达的孔隙结构,有利于SCR反应进行;随着煅烧温度升高,γ-Fe2O3催化剂表面晶格氧逐渐增加,颗粒形貌经历了片状颗粒(300、350 ℃)→球状颗粒(400 ℃)→针状颗粒(450 ℃)的变化过程,均匀的球状颗粒形貌及其表面丰富的晶格氧是400 ℃煅烧制得催化剂具备最优脱硝性能的重要因素.

     

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  • 刊出日期:  2015-05-25

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