Effect of Mg/Al molar ratio on the COS hydrogenation performance of MoSx/MgO-Al2O3 catalyst

ZHANG Xiao-xia; SUN Qiu-xia; WEI Fan-jing; LIAO Jun-jie; CHANG Li-ping; BAO Wei-ren

doi:10.19906/j.cnki.JFCT.2022015

Volume 50 Issue 8

Aug. 2022

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ZHANG Xiao-xia, SUN Qiu-xia, WEI Fan-jing, LIAO Jun-jie, CHANG Li-ping, BAO Wei-ren. Effect of Mg/Al molar ratio on the COS hydrogenation performance of MoSx/MgO-Al2O3 catalyst[J]. Journal of Fuel Chemistry and Technology, 2022, 50(8): 1051-1063. doi: 10.19906/j.cnki.JFCT.2022015

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ZHANG Xiao-xia, SUN Qiu-xia, WEI Fan-jing, LIAO Jun-jie, CHANG Li-ping, BAO Wei-ren. Effect of Mg/Al molar ratio on the COS hydrogenation performance of MoS_x/MgO-Al₂O₃ catalyst[J]. Journal of Fuel Chemistry and Technology, 2022, 50(8): 1051-1063. doi: 10.19906/j.cnki.JFCT.2022015

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Effect of Mg/Al molar ratio on the COS hydrogenation performance of MoS_x/MgO-Al₂O₃ catalyst

doi: 10.19906/j.cnki.JFCT.2022015

ZHANG Xiao-xia^{1, 2
,},
SUN Qiu-xia^{1, 2
,},
WEI Fan-jing^{1, 2},
LIAO Jun-jie^{1, 2
,
,},
CHANG Li-ping^{1, 2},
BAO Wei-ren^{1, 2}

1.
State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, China
2.
Key Laboratory of Coal Science and Technology, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China

Funds: The project was supported by the National Natural Science Foundation of China (22078222), Natural Foundation of Shanxi Province (201901D111119) and Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi.

Received Date: 2021-12-16
Accepted Date: 2022-03-01
Rev Recd Date: 2022-02-17

Available Online: 2022-03-14

Publish Date: 2022-08-26

Abstract

Abstract

MgO-Al₂O₃ supports with Mg/Al molar ratio of 0, 0.2, 0.5 and 1.0 were synthesized by coprecipitation method. Mo/M-A₀-S, Mo/M-A_0.2-S, Mo/M-A_0.5-S, and Mo/M-A_1.0-S catalysts were respectively prepared by molybdenum loading and followed by prevulcanization processes. Their catalytic performances for hydrogenation of COS in coke oven gas were evaluated in a fixed bed reactor. X-ray photoelectron spectroscopy and Raman spectroscopy were used to characterize the structure and Mo species of catalysts, and the effect of Mg/Al molar ratio on the COS hydrogenation performance of catalyst was investigated. The results show that the changing of Mg/Al molar ratio can modify the physical and chemical structure of MgO-Al₂O₃ support, the dispersion of Mo and its interaction with catalyst support, and the amount and layer number of MoS₂ active sites, so that to improve the activity and selectivity of catalyst. The Mg/Al molar ratio 0.5, which is equal to the stoichiometric ratio of Mg to Al in MgAl₂O₄, is the most favorite value for MgAl₂O₄ production. MgAl₂O₄ can reduce the interaction strength between Mo and catalyst support, enhance Mo dispersion, increase MoS₂ amount, and thus promote the catalyst performances. Mo/M-A_0.5-S is an excellent catalyst, which can convert 97.7% COS through hydrogenation with H₂S selectivity 100% in 550 min at 280 ℃ under the space velocity of 62000 h⁻¹.
- coke oven gas,
- COS,
- hydrodesulfurization,
- Mg/Al molar ratio,
- MoS_x/MgO-Al₂O₃ catalyst

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References(42)

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