公开(公告)号：US20230391716A1

公开(公告)日：2023-12-07

申请号：US18035625

申请日：2022-01-07

Applicant: Tsinghua University

Inventor： Yue PENG ,  Junhua LI ,  Zhen CHEN ,  Haibo YIN ,  Rong WANG

IPC: C07C273/16 ,  B01D53/78 ,  B01D53/56

CPC classification number: C07C273/16 ,  B01D53/78 ,  B01D53/56 ,  B01D2258/0283

Abstract: The present disclosure relates to a method and a system for preparing urea by coupling denitration with electrocatalytic reduction. Specifically, the method of the present disclosure comprises: introducing an absorption solution containing nitrite and nitrate, which is generated by subjecting flue gas containing nitric oxide to a denitration step, into a separation step to separate the nitrite and the nitrate, thereby obtaining a solution rich in the nitrite and the nitrate; and introducing the solution rich in the nitrite and the nitrate generated in the separation step into an electrocatalysis step, and carrying out the electrocatalytic reduction in the presence of carbon dioxide or carbonate ions to generate a urea solution. The system of the present disclosure comprises: a denitration device, a separation device connected to the denitration device, and an electrocatalytic device connected to the separation device. The method and system of the present disclosure can be used for the deep removal of nitrogen oxides from industrial flue gas at a low temperature, and can achieve the recycling of nitrogen.