Citation: Jian REN, Qing-Ze JIAO, Tong WANG, Yun-Feng GENG, Han-Sheng Li, Qin WU, Da-Xin SHI, Yun ZHAO, Cai-Hong FENG. CoMoS_x/CeO₂-γ-Al₂O₃ Catalyst: Preparation and Performance in Catalytic Reduction of SO₂[J]. Chinese Journal of Inorganic Chemistry, ;2021, 37(5): 844-852. doi: 10.11862/CJIC.2021.111 shu

CoMoS_x/CeO₂-γ-Al₂O₃ Catalyst: Preparation and Performance in Catalytic Reduction of SO₂

Jian REN ¹ ,
Qing-Ze JIAO ^{1, 2} ,
Tong WANG ¹ ,
Yun-Feng GENG ³ ,
Han-Sheng Li ^1,, ,
Qin WU ^1,, ,
Da-Xin SHI ¹ ,
Yun ZHAO ¹ ,
Cai-Hong FENG ¹

1.
Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
2.
School of Chemical Engineering and Materials Science, Beijing Institute of Technology (Zhuhai), Zhuhai, Guangdong 519085, China
3.
Beijing Peking University Pioneer Technology Co., Ltd., Beijing 100080, China

Corresponding author: Han-Sheng Li, hanshengli@bit.edu.cn Qin WU, wuqin_bit@126.com
Received Date: 3 December 2020
Revised Date: 9 March 2021

Figures(9)

CoMoS_x/CeO₂-γ-Al₂O₃ catalyst was prepared by introducing a small amount of CeO₂ by isovolume impregnation method. The morphology, reducibility, adsorption properties and reaction process of the catalysts were characterized by X-ray diffraction (XRD), high-angle annular dark field-scanning transmission electron microscopy (HAADF STEM), X-ray photoelectron spectroscopy (XPS), temperature programmed desorption/temperature programmed reduction/temperature programmed surface reaction (TPD/TPR/TPSR). And the catalytic performance and stability of the catalyst for CO reduction of SO₂ were studied using a fixed bed reactor. The results show that the introduction of a small amount of CeO₂ can reduce the reaction temperature. With the increase of CeO₂ content, the catalytic activity of CoMoS_x/CeO₂-γ-Al₂O₃ catalyst first increased and then decreased. The catalyst with 1.5% molar fraction of CeO₂ had the best catalytic activity. At the optimal reaction temperature of 350℃, SO₂ was almost completely converted to S, and the catalyst had excellent stability at 300℃. The metal elements on the surface of the catalyst prepared by the isovolume impregnation method were well dispersed; the introduction of CeO₂ improved the sulfidation degree and low-temperature reducibility of the catalyst, and increased the adsorption of SO₂ on the catalyst surface; COS reduced the catalyst at a lower temperature, making the reaction proceed according to the synergistic mechanism of COS and oxygen vacancies.
- reduction desulfurization,
- carbon monoxide,
- sulfur dioxide,
- isovolume impregnation method,
- cerium dioxide
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CoMoS_x/CeO₂-γ-Al₂O₃ Catalyst: Preparation and Performance in Catalytic Reduction of SO₂