DICP OpenIR
学科主题物理化学
Controlled synthesis of iron oxide nanorods and application in deNOx reactio
Mou XL(牟效玲); Li Y(李勇); Yao LD(姚立德); Liu T(刘涛); Su DS(苏党生); Shen WJ(申文杰)
会议文集abstracts of ACIN2011
会议名称International Symposium on Advanced Complex Inorganic 2011
会议日期2011-9-11
2011
会议地点那慕尔
页码0-0
出版者待补充
出版地待补充
合作性质分会口头报告
部门归属501
主办者比利时那慕尔大学
英文摘要Controlled synthesis of iron oxide nanorods and application in deNOx reaction Xiaoling Mu1,Yong Li1, Lide Yao2, Tao Liu1, Dangsheng Su2 and Wenjie Shen1* 1 State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, CAS, Zhongshan Road 457, 116023, Dalian, China (*email: shen98@dicp.ac.cn) 2 Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6 14195 Berlin, Germany Selective catalytic reduction of nitrogen oxides (NOx) with ammonia (NH3-SCR) is one of the key technologies for eliminating NOx. [1] The employed catalysts of this process mainly include noble metals, V2O5/TiO2 and zeolites, but the work windows are relatively narrow and/or the work temperatures are too high for these materials. Earlier literatures show that α-Fe2O3 can also catalyze the reaction but the activity was low. [2] The development of novel low-temperature NH3-SCR catalysts has attracting increasing interest. Here we report the controlled synthesis of iron oxide nanorods and the application in the NH3-SCR reaction. Figs. 1a and 1b show the precursor of β-FeOOH nanorods with uniform morphology obtained by controlled hydrolysis of Fe3+. The precursor was transformed to porous α-Fe2O3 nanorods after calcinations at 500 oC, preferentially exposing the (210) and (001) facets that are rich in iron atoms (Figs. 1c and 1d). When heat-treated in a PEG solution, porous γ-Fe2O3 nanorods were obtained, and the (110) and (001) facets containing both iron and oxygen atoms were preferentially exposed (Figs. 1e and 1f). Fig. 1 HRTEM Fig. 2 NH3-SCR activity (a) and stability of γ-Fe2O3 (b) The two kinds of nanorods were employed for the NH3-SCR reaction and both show very high low-temperature activities (Fig. 2a). The activity was higher over γ-Fe2O3, with NO conversion above 80% in a wide temperature range of 180-400 oC. Fig. 2b shows the 150 h on-stream performance of γ-Fe2O3 at 350 oC. No loss in activity was observed in the test span, demonstrating a high stability. We then introduced 20 ppm SO2 and 10% H2O in the feed, and witnessed a slight drop in activity. But the activity can be readily recovered when cutting off the supply of SO2 and H2O in the feed. The adsorption of NO on the iron oxide surface is a key step in NH3-SCR. NO-TPD, NH3-TPSR and in situ FTIR results revealed that γ-Fe2O3 nanorods were superior to α-Fe2O3 in adsorbing and activating NO molecules which might account for the high activity. This study also demonstrated the importance of morphology effect in preparing effective nanocatalysts. 1. V. I. Pârvulescu et al., Catal. Today 46, 233 (1998) 2. G. Ramis, L. Yi, G. Busca et al., J. Catal. 157, 523 (1995)  T1, T2, T3, T4  Oral presentation, Poster presentation; Controlled synthesis of iron oxide nanorods and application in deNOx reaction Xiaoling Mu1,Yong Li1, Lide Yao2, Tao Liu1, Dangsheng Su2 and Wenjie Shen1* 1 State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, CAS, Zhongshan Road 457, 116023, Dalian, China (*email: shen98@dicp.ac.cn) 2 Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6 14195 Berlin, Germany Selective catalytic reduction of nitrogen oxides (NOx) with ammonia (NH3-SCR) is one of the key technologies for eliminating NOx. [1] The employed catalysts of this process mainly include noble metals, V2O5/TiO2 and zeolites, but the work windows are relatively narrow and/or the work temperatures are too high for these materials. Earlier literatures show that α-Fe2O3 can also catalyze the reaction but the activity was low. [2] The development of novel low-temperature NH3-SCR catalysts has attracting increasing interest. Here we report the controlled synthesis of iron oxide nanorods and the application in the NH3-SCR reaction. Figs. 1a and 1b show the precursor of β-FeOOH nanorods with uniform morphology obtained by controlled hydrolysis of Fe3+. The precursor was transformed to porous α-Fe2O3 nanorods after calcinations at 500 oC, preferentially exposing the (210) and (001) facets that are rich in iron atoms (Figs. 1c and 1d). When heat-treated in a PEG solution, porous γ-Fe2O3 nanorods were obtained, and the (110) and (001) facets containing both iron and oxygen atoms were preferentially exposed (Figs. 1e and 1f). Fig. 1 HRTEM Fig. 2 NH3-SCR activity (a) and stability of γ-Fe2O3 (b) The two kinds of nanorods were employed for the NH3-SCR reaction and both show very high low-temperature activities (Fig. 2a). The activity was higher over γ-Fe2O3, with NO conversion above 80% in a wide temperature range of 180-400 oC. Fig. 2b shows the 150 h on-stream performance of γ-Fe2O3 at 350 oC. No loss in activity was observed in the test span, demonstrating a high stability. We then introduced 20 ppm SO2 and 10% H2O in the feed, and witnessed a slight drop in activity. But the activity can be readily recovered when cutting off the supply of SO2 and H2O in the feed. The adsorption of NO on the iron oxide surface is a key step in NH3-SCR. NO-TPD, NH3-TPSR and in situ FTIR results revealed that γ-Fe2O3 nanorods were superior to α-Fe2O3 in adsorbing and activating NO molecules which might account for the high activity. This study also demonstrated the importance of morphology effect in preparing effective nanocatalysts. 1. V. I. Pârvulescu et al., Catal. Today 46, 233 (1998) 2. G. Ramis, L. Yi, G. Busca et al., J. Catal. 157, 523 (1995)  T1, T2, T3, T4  Oral presentation, Poster presentation
文献类型会议论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/115973
专题中国科学院大连化学物理研究所
通讯作者Shen WJ(申文杰)
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Mou XL,Li Y,Yao LD,et al. Controlled synthesis of iron oxide nanorods and application in deNOx reactio[C]. 待补充:待补充,2011:0-0.
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