| 催化剂制备与研究 水热老化温度对Fe-Beta型分子筛NH3-SCR商业催化剂的影响 |
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| 引用本文： | 张子豪,石琎,陈铭夏,上官文峰,顾顺超,平野真一.催化剂制备与研究 水热老化温度对Fe-Beta型分子筛NH3-SCR商业催化剂的影响[J].工业催化,2017,25(8):41-47. |
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| 作者姓名： | 张子豪 石琎 陈铭夏 上官文峰 顾顺超 平野真一 |
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| 作者单位： | 1.上海交通大学机械与动力工程学院燃烧与环境技术中心,上海200240; 2.上海交通大学平野创新材料研究所,上海200240 |
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| 摘 要： | Fe-Beta型商业用分子筛催化剂经过不同温度水热老化处理后,测试其NH3-SCR反应活性与选择性,并利用NH3-TPD、O2-TPD、H2-TPR、BET、XRD和SEM等对样品的物化性能进行表征,考察不同水热老化温度对催化剂性能的影响及其作用机理。结果表明,水热老化导致催化剂的中低温度段活性下降,不同老化温度对催化剂性能的影响并不相同,呈现出两个不同阶段。较低水热老化温度下,催化剂表面吸附氧物种的能力、表面酸性位以及氧化能力的降低导致低温段活性降低;老化温度升至900 ℃后,催化剂微孔结构崩塌,比表面积大幅度减小,催化剂颗粒与表面Fe的氧化物物种出现严重团聚是导致催化剂中低温段性能大幅度降低的原因。
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| 关 键 词： | 催化化学 SCR 水热老化 Fe-Beta型分子筛 NOx |
Influence of hydrothermal aging temperatures on Fe-Beta zeolite commercial NH3-SCR catalyst |
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| Zhang Zihao,Shi Jin,Chen Mingxia,Shangguan Wenfeng,Gu Shunchao,Shin-ichi Hirano.Influence of hydrothermal aging temperatures on Fe-Beta zeolite commercial NH3-SCR catalyst[J].Industrial Catalysis,2017,25(8):41-47. |
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| Authors: | Zhang Zihao Shi Jin Chen Mingxia Shangguan Wenfeng Gu Shunchao Shin-ichi Hirano |
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| Affiliation: | 1.Research Center for Combustion and Environmental Technology,School of Mechanical and Power Engineering,Shanghai Jiao Tong University,Shanghai 200240,China; 2.Hirano Institute for Materials Innovation, Shanghai Jiao Tong University,Shanghai 200240,China |
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| Abstract: | Fe-Beta zeolite commercial catalysts were pretreated at different hydrothermal aging temperatures.NH3-SCR activity and selectivity of the catalysts were evaluated.The fresh and aged catalyst samples were characterized by NH3-TPD,O2-TPD,H2-TPR,BET,XRD and SEM.The influence of hydrothermal aging temperatures on the performance of catalysts and their mechanism of hydrothermal deactivation were investigated.The results showed that hydrothermal aging resulted in the activity of the catalysts at low and intermediate temperature ranges was reduced.The influence of different aging temperatures on the performance of the catalysts was different in different temperature and exhibited two different stages.At lower hydrothermal aging temperature,the low temperature activity of the catalysts was reduced mainly due to the decrease of surface oxygen species,surface acidy site and oxidation capacity.When the sample aging temperature increased to 900 ℃,the micro-structure of catalyst was collapse,and BET surface area decreased obviously.The agglomeration of catalyst particles and α-Fe2O3 species of the surface led to significant decrease of activity at low and middle temperature ranges. |
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| Keywords: | catalytic chemistry SCR hydrothermal aging Fe-Beta zeolite NOx |
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