Preparation of nanosheet Fe-ZSM-5 catalysts, and effect of Fe content on acidity, water, and sulfur resistance in the selective catalytic reduction of NO x by ammonia

被引：23
作者：
Ma, Luoning [1 ]
Qu, Hongxia [1 ]
Zhang, Jie [1 ]
Tang, Qisheng [1 ]
Zhang, Shule [1 ]
Zhong, Qin [1 ]
机构：
[1] Nanjing Univ Sci & Technol, Sch Chem Engn, Nanjing 210094, Jiangsu, Peoples R China
来源：
RESEARCH ON CHEMICAL INTERMEDIATES | 2013年 / 39卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Fe-ZSM-5; catalysts; Nanosheets; SCR; NOx; Water and sulfur resistance; NITRIC-OXIDE; ZEOLITE; NH3; TEMPERATURE; OXIDATION; FEZSM-5; MFI; NITROGEN; SITES; N2O;
D O I：
10.1007/s11164-012-0927-9
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Direct synthesis of nanosheet Fe-ZSM-5 catalysts and their use for selective catalytic reduction (SCR) of NO (x) by ammonia were studied. XRD, BET, SEM, EPR, and NH3-TPD were used to understand the properties of catalysts with different iron loading. XRD confirmed the presence of the ZSM-5 crystal phase, and there was no Fe2O3 phase on the surface of the crystals. SEM showed the Fe-ZSM-5 catalysts comprised microspheres made up of nanosheets. EPR indicated that the iron was present as isolated Fe(3+)and FeO (x) oligomers uniformly dispersed throughout the crystals. NH3-TPD indicated that Fe-ZSM-5 (20,1:1) had maximum acid sites and density at approximately 250 and 450 A degrees C, respectively. Fe-ZSM-5 (20,1:1) had the highest activity in the SCR reaction with NH3. It was also confirmed that Fe-ZSM-5 (20,1:1) had excellent resistance to SO2 and H2O under the SCR reaction conditions. The effects of water vapor and SO2, iron loading, and the Si/(Fe + Al) ratio were also investigated for these catalysts.
引用
收藏
页码：4109 / 4120
页数：12
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