Effect of Pr/Zr atomic ratio on the activity of catalytic oxidation denitration of PrxZr1−xO2–δ

GONG You-jing; HE Ren-guang; ZHAO Guang-lei; JIA Li-juan; GAO Ji-yun; WANG Fang; DUAN Kai-jiao; LIU Tian-cheng

doi:10.1016/S1872-5813(23)60341-X

Volume 51 Issue 7

Jul. 2023

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Article Navigation > Journal of Fuel Chemistry and Technology > 2023 > 51(7): 996-1006

GONG You-jing, HE Ren-guang, ZHAO Guang-lei, JIA Li-juan, GAO Ji-yun, WANG Fang, DUAN Kai-jiao, LIU Tian-cheng. Effect of Pr/Zr atomic ratio on the activity of catalytic oxidation denitration of PrxZr1−xO2–δ[J]. Journal of Fuel Chemistry and Technology, 2023, 51(7): 996-1006. doi: 10.1016/S1872-5813(23)60341-X

Citation:

GONG You-jing, HE Ren-guang, ZHAO Guang-lei, JIA Li-juan, GAO Ji-yun, WANG Fang, DUAN Kai-jiao, LIU Tian-cheng. Effect of Pr/Zr atomic ratio on the activity of catalytic oxidation denitration of Pr_xZr_1−xO_2–δ[J]. Journal of Fuel Chemistry and Technology, 2023, 51(7): 996-1006. doi: 10.1016/S1872-5813(23)60341-X

Citation:

GONG You-jing, HE Ren-guang, ZHAO Guang-lei, JIA Li-juan, GAO Ji-yun, WANG Fang, DUAN Kai-jiao, LIU Tian-cheng. Effect of Pr/Zr atomic ratio on the activity of catalytic oxidation denitration of Pr_xZr_1−xO_2–δ[J]. Journal of Fuel Chemistry and Technology, 2023, 51(7): 996-1006. doi: 10.1016/S1872-5813(23)60341-X

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Effect of Pr/Zr atomic ratio on the activity of catalytic oxidation denitration of Pr_xZr_1−xO_2–δ

doi: 10.1016/S1872-5813(23)60341-X

1.
School of Chemistry and Environment, Yunnan Minzu University, Kunming 650504, China

Funds: The project was supported by the National Natural Science Foundation of China (51568068) and the Young and Middle-aged Academic and Technical Leaders Reserve Talent Project (202105AC160054)

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Corresponding author: Tel: 13708893755, E-mail: liutiancheng76@163.com
Received Date: 2022-11-11
Accepted Date: 2022-12-21
Rev Recd Date: 2022-12-20

Available Online: 2023-02-27

Publish Date: 2023-07-01

Abstract

Abstract

The Pr_xZr_1−xO_2–δ catalyst with different atom ratio of Pr/Zr was prepared by the sol-gel to catalytic oxidation denitration. Results showed that the efficiency of catalytic oxidation denitration increased initially and decreased afterward with the ratio of Pr atom increased. And the optimum denitration activity could achieve 94.62% at 250 °C when the atom ratio of Pr/Zr was 5∶5. The catalysts were characterized by SEM, N₂ adsorption-desorption, XRD, XPS, H₂-TPR, and FT-IR. The results illustrated that the catalyst (Pr_0.5Zr_0.5O_2−δ) with the best activity has a “layered” morphology, many pores on the surface, and it has a large specific surface area and pore volume of 77.74 m²/g and 0.66 cm³/g, respectively. Furthermore, the crystalline phase transforms from c-ZrO₂ to Pr₂Zr₂O₇ with the increasing of Pr atom. XPS and H₂-TPR results showed that the surface chemosorption oxygen and surface Pr^{4 +} oxides increased, and the rising of Pr atom ratio was beneficial to produce oxygen vacancy (Vӧ) site which advantageous to improve the efficiency of catalytic oxidation denitration. FT-IR characterization results indicated that Pr_0.5Zr_0.5O_2−δ solid solution had better NO selectivity, which was conducive to the catalytic oxidation of NO. The anti-SO₂ and H₂O toxicity experiments showed that Pr/Zr atomic ratio at 5∶5 had better anti-toxicity than other ratios. In addition, using IC to analysis absorption products, the result showed that ${\rm{NO}}^-_2 $ and ${\rm{NO}}^-_3 $ were the main products in the absorption solution.
- catalytic oxidation,
- nitric oxides,
- Pr_xZr_1−xO_2−δ,
- atom ratio of Pr/Zr

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References(41)

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