Surface characteristics of regenerative Fe-KOH/LSB catalysts for low-temperature catalytic hydrolysis of carbon disulfide and research of the surface regeneration mechanism

Abstract

In the present study, a series of regeneration conditions and the regeneration mechanism of modified lake sediment biochar (Fe-KOH/LSB) catalysts for low-temperature catalytic hydrolysis of carbon disulfide (CS₂) were investigated. The results showed that Rm-WNA method had the best regeneration effect. Under optimal regeneration conditions, the sulfur capacity (13.86 mg_[S]/g_[catalyst]) of regenerated Fe-KOH/LSB was close to that of fresh Fe-KOH/LSB (14.88 mg_[S]/g_[catalyst]). The water washing process could wash away a small number of sulfates and a large number of alkaline groups. TG-DTA and DRTFIR results indicated that the nitrogen sweeping process could decompose Fe₂(SO₄)₃ into Fe₂O₃, which partially recovered the catalytic and the adsorptive abilities. CO₂-TPD results indicated that the alkali steeping process offer −OH groups, further improving the catalytic and the adsorptive abilities. After 3 times-regeneration, the sulfur capacity of Fe-KOH/LSB reached 13.31 mg_[S]/g_[catalyst], indicating that the Rm-WNA method had good stability for the recovery of the catalytic activity. BET, XPS and XRD results revealed that the decrease of the sulfur capacity for regeneration was attributed to the decrease of the adsorptive abilities of C and SiO₂.

Keywords

regeneration condition / modified lake sediment / regeneration mechanism / biochar / catalytic hydrolysis / carbon disulfide

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Acknowledgements

This work was supported by the National Key R&D Program of China (2018YFC0213400), the National Natural Science Foundation of China (Grant Nos. 51408282, 21667015 and 51708266), the China Scholarship Council (201508530017, 201608530169 and 201608740011), and the Analysis and Testing Foundation of Kunming University of Science and Technology.

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