Citation: Yan Xia, Wangcheng Zhan, Yun Guo, Yanglong Guo, Guanzhong Lu. Fe-Beta zeolite for selective catalytic reduction of NO_x with NH₃: Influence of Fe content[J]. Chinese Journal of Catalysis, ;2016, 37(12): 2069-2078. doi: 10.1016/S1872-2067(16)62534-2 shu

Fe-Beta zeolite for selective catalytic reduction of NO_x with NH₃: Influence of Fe content

Key Laboratory for Advanced Materials and Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China

Received Date: 29 August 2016
Revised Date: 30 September 2016

Fund Project: This work was supported by the National Key Basic Research Program of China (973 Program, 2013CB933201), the National Natural Science Foundation of China (21577034, 21333003, 91545103), Science and Technology Commission of Shanghai Municipality (16ZR1407900) and Fundamental Research Funds for the Central Universities (WJ1514020).

Fe doped Beta zeolite with different Fe contents were prepared by ion exchange by changing the volume or the concentration of a Fe salt solution. For a particular mass of Fe salt precursor, the concentration of the metal salt solution during ion exchange influenced the ion exchange capacity of Fe, and resulted in different activities of the Fe-Beta catalyst. Fe-Beta catalysts with the Fe contents of (2.6, 6.3 and 9) wt% were synthesized using different amounts of 0.02 mol/L Fe salt solution. These catalysts were studied by various characterization techniques and their NH₃-SCR activities were evaluated. The Fe-Beta catalyst with the Fe content of 6.3 wt% exhibited the highest activity, with a temperature range of 202-616℃ where the NO_x conversion was > 80%. The Fe content in Beta zeolite did not influence the structure of Beta zeolite and valence state of Fe. Compared with the Fe-Beta catalysts with low Fe content (2.6 wt%), Fe-Beta catalysts with 6.3 wt% Fe content possessed more isolated Fe³⁺ active sites which led to its higher NH₃-SCR activity. A high capacity for NH₃ and NO adsorption, and a high activity for NO oxidation also contributed to the high NH₃-SCR activity of the Fe-Beta catalyst with 6.3 wt%. However, when the Fe content was further increased to 9.0 wt%, the amount of Fe_xO_y nanoparticles increased while the amount of isolated Fe³⁺ active sites was unchanged, which promoted NH₃ oxidation and decreased the NH₃-SCR activity at high temperature.
- Beta zeolite,
- Selective catalytic reduction,
- Fe content,
- Fe species,
- Ion exchange
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Fe-Beta zeolite for selective catalytic reduction of NOx with NH3: Influence of Fe content

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Fe-Beta zeolite for selective catalytic reduction of NO_x with NH₃: Influence of Fe content