Catalytic decomposition of N2O over Y-Co3O4 composite oxides prepared by one-step hydrothermal method

ZHAO Tian-qi; GAO Qiang; LI He-jian; XU Xiu-feng

Volume 47 Issue 4

Apr. 2019

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Article Navigation > Journal of Fuel Chemistry and Technology > 2019 > 47(4): 446-454

ZHAO Tian-qi, GAO Qiang, LI He-jian, XU Xiu-feng. Catalytic decomposition of N2O over Y-Co3O4 composite oxides prepared by one-step hydrothermal method[J]. Journal of Fuel Chemistry and Technology, 2019, 47(4): 446-454.

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ZHAO Tian-qi, GAO Qiang, LI He-jian, XU Xiu-feng. Catalytic decomposition of N₂O over Y-Co₃O₄ composite oxides prepared by one-step hydrothermal method[J]. Journal of Fuel Chemistry and Technology, 2019, 47(4): 446-454.

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Catalytic decomposition of N₂O over Y-Co₃O₄ composite oxides prepared by one-step hydrothermal method

Institute of Applied Catalysis, School of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China

Funds:

Shandong Natural Science Foundation ZR2017MB020

Graduate Innovation Foundation of Yantai University YDYB1909

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Corresponding author: XU Xiu-feng, E-mail: xxf@ytu.edu.cn
Received Date: 2019-01-08
Rev Recd Date: 2019-03-03

Available Online: 2021-01-23

Publish Date: 2019-04-10

Abstract

Abstract

Y-Co₃O₄ catalysts with Y/Co molar ratio of 0.03 were prepared by several methods, such as one-step hydrothermal, two-step hydrothermal, and impregnation methods, to catalyze the decomposition of N₂O. Among these catalysts, the one prepared by one-step hydrothermal method exhibited the highest activity, and then the Y-Co₃O₄ catalysts with various molar ratios of Y/Co were synthesized by one-step hydrothermal method. Subsequently, the optimized 0.03Y-Co₃O₄ was impregnated by K₂CO₃ solution to prepare K-modified catalyst and named as 0.02K/0.03Y-Co₃O₄. These catalysts were characterized by X-ray diffraction (XRD), nitrogen physisorption, hydrogen temperature-programmed reduction (H₂-TPR), oxygen temperature-programmed desorption (O₂-TPD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) techniques. The results show that both Co₃O₄ and Y-Co₃O₄ exhibit spinel structure, however Y-doped Co₃O₄ catalysts are more active than bare Co₃O₄. After further modified by potassium, the 0.02K/0.03Y-Co₃O₄ reveals higher activity due to the more active sites (Co²⁺) and easier desorption of surface oxygen species than un-modified 0.03Y-Co₃O₄. In detail, the temperatures of N₂O full conversion over 0.02K/0.03Y-Co₃O₄ catalyst are 325, 350, 375℃, under the reaction atmospheres of 1%N₂O+Ar, 1%N₂O+2%O₂+Ar, 1%N₂O+2%O₂+8.2%H₂O+Ar, respectively. In addition, over 90% conversion of N₂O can be maintained at 350℃ after continuous reaction for 50 h in the co-presence of oxygen and steam on K-modified Y-Co₃O₄ catalyst. There is a dynamic compensation effect between apparent activation energy (E_a) and pre-exponential factor (A) in N₂O decomposition over Y-Co₃O₄ and K-modified catalysts.
- catalytic decomposition of N₂O,
- Y-Co₃O₄ composite oxides,
- K-modified catalyst,
- one-step hydrothermal method,
- catalytic activity

本文的英文电子版由Elsevier出版社在ScienceDirect上出版(http://www.sciencedirect.com/science/journal/18725813).

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References(23)

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