Selective catalytic reduction of nitric oxide with propylene over one-step synthesized Cu-SAPO-44 catalysts

ZHANG Heng; ZHOU Hao; WEN Ni-ni; WANG Xu-rui; XU Lu; SU Ya-xin

doi:10.19906/j.cnki.JFCT.2022012

Volume 50 Issue 8

Aug. 2022

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ZHANG Heng, ZHOU Hao, WEN Ni-ni, WANG Xu-rui, XU Lu, SU Ya-xin. Selective catalytic reduction of nitric oxide with propylene over one-step synthesized Cu-SAPO-44 catalysts[J]. Journal of Fuel Chemistry and Technology, 2022, 50(8): 1064-1074. doi: 10.19906/j.cnki.JFCT.2022012

Citation:

ZHANG Heng, ZHOU Hao, WEN Ni-ni, WANG Xu-rui, XU Lu, SU Ya-xin. Selective catalytic reduction of nitric oxide with propylene over one-step synthesized Cu-SAPO-44 catalysts[J]. Journal of Fuel Chemistry and Technology, 2022, 50(8): 1064-1074. doi: 10.19906/j.cnki.JFCT.2022012

Citation:

ZHANG Heng, ZHOU Hao, WEN Ni-ni, WANG Xu-rui, XU Lu, SU Ya-xin. Selective catalytic reduction of nitric oxide with propylene over one-step synthesized Cu-SAPO-44 catalysts[J]. Journal of Fuel Chemistry and Technology, 2022, 50(8): 1064-1074. doi: 10.19906/j.cnki.JFCT.2022012

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Selective catalytic reduction of nitric oxide with propylene over one-step synthesized Cu-SAPO-44 catalysts

doi: 10.19906/j.cnki.JFCT.2022012

ZHANG Heng^1
,,
ZHOU Hao^{2
,
,},
WEN Ni-ni¹,
WANG Xu-rui²,
XU Lu²,
SU Ya-xin^{1
,
,}

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

Funds: The project was supported by Natural Science Foundation of Jiangsu Province (BK20181161), National Natural Science Foundation of China (51278095), Jiangsu 333 Engineering Research Project (2018) and Jiangsu Provincial Excellent Science and Technology Innovation Team (2019).

Received Date: 2021-12-31
Accepted Date: 2022-02-18
Rev Recd Date: 2022-02-11

Available Online: 2022-02-25

Publish Date: 2022-08-26

Abstract

Abstract

Cu-SAPO-44 zeolite catalysts were synthesized by one-step hydrothermal method using cyclohexylamine (CHA) and Cu-amine complex (Cu-TEPA) as co-template. They were used for selective catalytic reduction of nitric oxide with propylene (C₃H₆-SCR) under lean burning condition. These catalysts were characterized by N₂ adsorption-desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-vis spectroscopy (UV-vis), NH₃ temperature-programmed desorption (NH₃-TPD) and H₂ temperature-programmed reduction (H₂-TPR). Compared with pure SAPO-44, the introduction of Cu-TEPA significantly enhanced the catalytic activity of C₃H₆-SCR. When Cu/Al was 0.25, Cu-SAPO-44 catalyst had the largest specific surface area, abundant acidic sites and moderate isolated Cu²⁺ species, thus it had the best deNO_x performance. With the increase of Cu-TEPA introduction, copper species would aggregate on the surface of the zeolite and form more inactive CuO, thus reducing the denitrification activity. In situ study by DRIFTS indicated that isolated Cu²⁺ could contribute to the adsorption and activation of NO and C₃H₆, thus enhancing in the formation of −NCO, which was a key intermediate of the reaction. The Cu-SAPO-44 catalyst maintained more than 60% NO_x conversion and more than 90% N₂ selectivity in long term test of 50 h, showing appropriate reaction stability.
- Cu-SAPO-44,
- selective catalytic reduction,
- NO,
- C₃H₆-SCR

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References(49)

References

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