Effect of Ag on deNOx performance of SCR-C3H6 over Fe/Al-PILC catalysts

ZHANG Xian-wei; SU Ya-xin; CHENG Jiang-hao; LIN Rui; WEN Ni-ni; DENG Wen-yi; ZHOU Hao

Volume 47 Issue 11

Nov. 2019

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Article Navigation > Journal of Fuel Chemistry and Technology > 2019 > 47(11): 1368-1378

ZHANG Xian-wei, SU Ya-xin, CHENG Jiang-hao, LIN Rui, WEN Ni-ni, DENG Wen-yi, ZHOU Hao. Effect of Ag on deNOx performance of SCR-C3H6 over Fe/Al-PILC catalysts[J]. Journal of Fuel Chemistry and Technology, 2019, 47(11): 1368-1378.

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ZHANG Xian-wei, SU Ya-xin, CHENG Jiang-hao, LIN Rui, WEN Ni-ni, DENG Wen-yi, ZHOU Hao. Effect of Ag on deNO_x performance of SCR-C₃H₆ over Fe/Al-PILC catalysts[J]. Journal of Fuel Chemistry and Technology, 2019, 47(11): 1368-1378.

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Effect of Ag on deNO_x performance of SCR-C₃H₆ over Fe/Al-PILC catalysts

1.
School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
2.
Changzhou Vocational Institute of Engineering, Changzhou 213164, China

Funds:

the Natural Science Foundation of Shanghai 19ZR1400700

Jiangsu Province Natural Science Foundation BK20181161

the Fundamental Research Funds for the Central Universities 2232019D3-24

More Information

Corresponding author: SU Ya-xin, Tel:021-67792552, E-mail:suyx@dhu.edu.cn
Received Date: 2019-06-17
Rev Recd Date: 2019-09-09

Available Online: 2021-01-23

Publish Date: 2019-11-10

Abstract

Abstract

Silver has been widely used to modify the iron-based catalyst supported on alumina pillared montmorillonite to enhance its activity at lower temperature (< 300℃). Bimetallic Ag-Fe/Al-PILC (Pillared interlayer clay) was prepared by the ultrasonic impregnation method and performance was tested on a fixed bed reactor. And the experiment results showed that silver obviously improved the catalyst activity at a lower temperature. The NO conversion efficiency of Ag-Fe/Al-PILC at 250℃ was 60%, which was higher than Fe/Al-PILC (20%). The maximum 82% NO conversion and 100% N₂ selectivity were obtained by 2.1Ag-Fe/Al-PILC at 250℃. Moreover, Ag-Fe/Al-PILC revealed better anti-hydrogen peroxide and anti-sulfur dioxide ability. The catalyst characterization was conducted by several techniques with respect to the microstructure and physicochemical properties. According to the effects of N₂-adsorption and desorption tests, Ag-Fe/Al-PILC formed a stable overall structure and had a large internal specific surface area. Besides, XRD and UV-vis proved that the Ag-Fe solid solution, Ag⁺ and Ag_n^δ+ species formed on the surface of the catalyst are the key factors affecting its low-temperature activity. XPS results suggested that there was electron transfer between Ag and Fe, which formed a synergistic effect of bimetals and changed the content of Ag and Fe and their valence state on the catalyst surface. The findings of H₂-TPR indicated that the modification of Ag promoted the shift of the Fe/Al-PILC reduction peak toward low temperature, which boosted the low-temperature reduction capacity of the catalyst. The surface acidity analysis by Py-FTIR indicated that Lewis acid and Brønsted acid existed simultaneously and Ag enhanced the stability of Brønsted acid.
- selective catalytic reduction,
- pillared clay,
- Ag-Fe/Al-PILC

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References(59)

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