	US 12,129,566 B2
	Method for preparing hydrogen sulfide from sulfur dioxide by electrochemical reduction
Hui Liu, Changsha (CN); Kaisong Xiang, Changsha (CN); Liyuan Chai, Changsha (CN); Fenghua Shen, Changsha (CN); Xudong Liu, Changsha (CN); Fangfang Zhu, Changsha (CN); Lin Wu, Changsha (CN); Huimin Yi, Changsha (CN); Xiaobo Min, Changsha (CN); Zhang Lin, Changsha (CN); Qingzhu Li, Changsha (CN); Qingwei Wang, Changsha (CN); Haiying Wang, Changsha (CN); and Weichun Yang, Changsha (CN)
Assigned to CENTRAL SOUTH UNIVERSITY, Changsha (CN)
Filed by CENTRAL SOUTH UNIVERSITY, Changsha (CN)
Filed on Mar. 29, 2022, as Appl. No. 17/707,903.
Claims priority of application No. 202110343864.3 (CN), filed on Mar. 31, 2021.
Prior Publication US 2022/0316078 A1, Oct. 6, 2022
Int. Cl. C25B 9/23 (2021.01); B01D 53/50 (2006.01); B01D 53/78 (2006.01); C25B 1/01 (2021.01); C25B 1/50 (2021.01); C25B 11/052 (2021.01); C25B 11/057 (2021.01); C25B 11/075 (2021.01); C25B 11/081 (2021.01); C25B 15/08 (2006.01)

CPC C25B 9/23 (2021.01) [B01D 53/502 (2013.01); B01D 53/78 (2013.01); C25B 1/01 (2021.01); C25B 1/50 (2021.01); C25B 11/052 (2021.01); C25B 11/057 (2021.01); C25B 11/075 (2021.01); C25B 11/081 (2021.01); C25B 15/08 (2013.01); B01D 2251/306 (2013.01); B01D 2251/604 (2013.01)]

20 Claims

1. A method for preparing hydrogen sulfide from sulfur dioxide by an electrochemical reduction, comprising electrochemically reducing the sulfur dioxide absorbed in an aqueous solution into gaseous hydrogen sulfide with a membrane electrode, wherein the membrane electrode is a porous membrane with a catalytic function for SO₂conversion and separation function for H₂S gas products, wherein the electrochemical reduction of the sulfur dioxide absorbed in the aqueous solution is carried out by using a three-electrode system with the aqueous solution absorbed with the sulfur dioxide as a cathode compartment electrolyte and the membrane electrode as a working electrode.