Sb-Fe bimetallic non-aqueous phase desulfurizer for efficient absorption of hydrogen sulfide: A combined experimental and DFT study
- Resource Type
- Article
- Authors
- Zhihao Liu; Kui Qiu; Yu Dong; Zhaobo Jin; Luwei Liu; Jirong Wu
- Source
- Korean Journal of Chemical Engineering, 39(12), 273, pp.3305-3314 Dec, 2022
- Subject
- 화학공학
- Language
- English
- ISSN
- 1975-7220
0256-1115
A non-aqueous phase (Sb/Fe/NMP) desulfurization system for the removal of hydrogen sulfide from naturalgas was constructed by introducing SbCl3 and FeCl3 in a specific ratio into N-methylpyrrolidone (NMP). The desulfurizingagent and its sulfur product were characterized, and the absorption pattern of H2S by the system wasinvestigated by static desulfurization experiments. The results indicate that the desulfurizer’s sulfur capacity can reach16 g/L at room temperature and pressure, and that adding the optimum amount of water and appropriate temperatureincrease can assist to increase desulfurization efficiency. The system maintained a sulfur capacity level of more than90% of the initial sulfur capacity after five consecutive desulfurization-regeneration cycles. XRD and XPS spectrogramrevealed that the regenerated solid product was high purity sulfur. Sb3+ is a key component to ensure the effectiveabsorption of H2S. The presence of a moderate amount of Fe3+ can oxidize and absorb small amounts of H2S and promotethe oxidative regeneration of the system. In addition, we combined the obtained experimental data with densityflooding theory (DFT) theoretical calculations to show that the effective coordination of Sb(III) with HS in the NMPenvironment is the main reason for the effective absorption of H2S by the desulfurizer. NMP is not involved in thecoordination absorption process of hydrogen sulfide.