DEACTIVATION MECHANISM OF γ-Al<sub>2</sub>O<sub>3</sub> BASED CATALYSTS FOR THE CATALYTIC HYDROLYSIS OF CARBONYL SULFIDE IN PRESENCE OF HCl

CAO Qiang; LI Yuran; WANG Bin; WANG Jiancheng; ZHU Tingyu

doi:10.13205/j.hjgc.202312022

Volume 41 Issue 12

Dec. 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(12): 182-189

CAO Qiang, LI Yuran, WANG Bin, WANG Jiancheng, ZHU Tingyu. DEACTIVATION MECHANISM OF γ-Al2O3 BASED CATALYSTS FOR THE CATALYTIC HYDROLYSIS OF CARBONYL SULFIDE IN PRESENCE OF HCl[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(12): 182-189. doi: 10.13205/j.hjgc.202312022

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CAO Qiang, LI Yuran, WANG Bin, WANG Jiancheng, ZHU Tingyu. DEACTIVATION MECHANISM OF γ-Al₂O₃ BASED CATALYSTS FOR THE CATALYTIC HYDROLYSIS OF CARBONYL SULFIDE IN PRESENCE OF HCl[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(12): 182-189. doi: 10.13205/j.hjgc.202312022

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DEACTIVATION MECHANISM OF γ-Al₂O₃ BASED CATALYSTS FOR THE CATALYTIC HYDROLYSIS OF CARBONYL SULFIDE IN PRESENCE OF HCl

doi: 10.13205/j.hjgc.202312022

1. State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, China;
2. Innovation Academy for Green Manufacturing, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Received Date: 2023-03-28
Available Online: 2024-03-08

Abstract

Abstract

With the implementation of ultra-low emissions in the iron and steel industry, applying blast furnace gas desulfurization technology is very urgent. The sulfur-containing component in blast furnace gas mainly is carbonyl sulfide (COS), and the catalytic hydrolysis method on the γ-Al₂O₃-based catalyst is usually selected to generate H₂S and then further removed. However, the hydrolysis catalyst is easily deactivated in the presence of HCl from the blast furnace gas. In this work, the γ-Al₂O₃-based catalyst was prepared by the impregnation method supported with alkali metals, Na or K, as an active component. The effect of HCl on the hydrolysis activity and deactivation mechanism of the catalyst was investigated through the combined platform of a fixed-bed reactor and gas chromatography. The hydrolysis efficiency of COS was tested at 120 ℃, gas hourly space velocity (GHSV) of 150000 h^-1. The results showed that hydrolysis efficiency and chlorine resistance on catalysts Na/Al₂O₃ and K/Al₂O₃ were higher than that on γ-Al₂O₃, and the chlorine resistance on Na/Al₂O₃ was higher than that on K/Al₂O₃. The active components, Na and K increased the content of alkaline centers of the catalyst, promoted the COS hydrolysis reaction and improved the catalyst activity. The active component Na or K preferentially reacts with HCl to form metal chloride, weakens the chlorination effect of HCl on the support components and improves the chlorine resistance of the catalyst. The deactivation mechanism of Na/Al₂O₃ and K/Al₂O₃ catalysts in the presence of HCl was investigated. HCl occupied the medium-strong alkaline center (M—O) of the catalysts and reacted with the active components of alkali metals to form metal chloride (M—Cl), and then reduced the catalyst activity. The loss of Na in Na/Al₂O₃ in the presence of HCl was significantly lower than K in K/Al₂O₃, which improved the chlorine resistance of Na/Al₂O₃ catalyst.
- blast furnace gas desulfurization,
- catalytic hydrolysis,
- carbonyl sulfide,
- aluminum-based catalyst,
- alkali metals,
- hydrogen chloride

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References

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