Effect of Mg modification on the catalytic performance of Co/γ-Al2O3-TiO2 in the combustion of propane

LIU Zhao; CHENG Li-jun; HU Xin; YUAN Shan-liang; BO Qi-fei; ZHANG Biao; JIANG Yi

Volume 48 Issue 7

Jul. 2020

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Article Navigation > Journal of Fuel Chemistry and Technology > 2020 > 48(7): 867-874

LIU Zhao, CHENG Li-jun, HU Xin, YUAN Shan-liang, BO Qi-fei, ZHANG Biao, JIANG Yi. Effect of Mg modification on the catalytic performance of Co/γ-Al2O3-TiO2 in the combustion of propane[J]. Journal of Fuel Chemistry and Technology, 2020, 48(7): 867-874.

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LIU Zhao, CHENG Li-jun, HU Xin, YUAN Shan-liang, BO Qi-fei, ZHANG Biao, JIANG Yi. Effect of Mg modification on the catalytic performance of Co/γ-Al₂O₃-TiO₂ in the combustion of propane[J]. Journal of Fuel Chemistry and Technology, 2020, 48(7): 867-874.

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Effect of Mg modification on the catalytic performance of Co/γ-Al₂O₃-TiO₂ in the combustion of propane

LIU Zhao^{1, 2},
CHENG Li-jun^{1, 2},
HU Xin^{1, 2},
YUAN Shan-liang¹,
BO Qi-fei¹,
ZHANG Biao¹,
JIANG Yi^{1
,
,}

1.
National Engineering Laboratory for VOCs Pollution Control Material&Technology(Chengdu), Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Funds:

Sichuan Science and Technology Program 2018GZ0314

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Corresponding author: JIANG Yi, Tel:028-85229457, E-mail:yjiang@cioc.ac.cn
Received Date: 2020-07-02
Rev Recd Date: 2020-07-10

Available Online: 2021-01-23

Publish Date: 2020-07-10

Abstract

Abstract

A series of Mg-modified Co/MgO/γ-Al₂O₃-TiO₂ catalysts were prepared by multi-step impregnation method and characterized by X-ray diffraction (XRD), diffuse reflectance visible ultra violet spectroscopy (DR-UV-vis), N₂ adsorption-desorption, X-ray photoelectron spectroscopy (XPS) and H₂ temperature-programmed reduction (H₂-TPR); the effect of Mg modification on the catalytic performance of Co/MgO/γ-Al₂O₃-TiO₂ in the combustion of propane was investigated. The results indicate that Co exists in the form of Co₃O₄ on both the pristine γ-Al₂O₃-TiO₂ and Mg-modified MgO/γ-Al₂O₃-TiO₂ supports; Mg added in the MgO/γ-Al₂O₃-TiO₂ support interacts with Al₂O₃, forming MgAl₂O₄ spinel, which can improve the textural properties and promote the dispersion of Co₃O₄. Moreover, the interaction between MgAl₂O₄ and Co₃O₄ can increase the proportions of Co³⁺/Co²⁺ and O_ads/O_latt on the catalyst surface, weaken the Co-O bond, and thereby enhance the activity of Co-based catalyst in propane combustion. For the propane combustion over the Co/MgO(15%)/γ-Al₂O₃-TiO₂ catalyst with an Mg loading of 15%, the temperature to achieve a propane conversion of 90% is decreased by 45℃ in comparison with that over the Mg-free Co/γ-Al₂O₃-TiO₂ catalyst; moreover, the Co/MgO(15%)/γ-Al₂O₃-TiO₂ catalyst exhibits excellent stability and no decrease in the activity is observed in a 40 h continuous reaction test for propane combustion.
- Co₃O₄,
- MgAl₂O₄ spinel,
- catalytic combustion,
- propane,
- interaction

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References(33)

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