Citation: 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. shu

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-liang ¹ ,
BO Qi-fei ¹ ,
ZHANG Biao ¹ ,
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

Corresponding author: JIANG Yi, yjiang@cioc.ac.cn
Received Date: 2 July 2020
Revised Date: 10 July 2020

Fund Project: The project was supported by Sichuan Science and Technology Program (2018GZ0314) and Project of CAS "Light of West China" Program, 2014Sichuan Science and Technology Program 2018GZ0314

Figures(6)

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

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