公开(公告)号：US20200023312A1

公开(公告)日：2020-01-23

申请号：US16465825

申请日：2017-12-01

Applicant: LOUGHBOROUGH UNIVERSITY

Inventor： Jonathan WILSON ,  Graham HARGRAVE

IPC: B01D53/90 ,  B01D53/94 ,  B01D53/86 ,  C01B21/12 ,  C07C269/04 ,  F01N3/20

Abstract: A process for reducing nitrogen oxides in an exhaust stream, such as a vehicle exhaust stream, and apparatus for carrying out the process. The process comprises providing a first composition comprising aqueous urea, a second composition comprising ammonium carbamate and an exhaust stream comprising nitrogen oxides. A process for producing the ammonium carbamate is also provided. The second composition may be introduced into the exhaust stream (10) when the exhaust stream has a temperature below a threshold temperature and the first composition may be introduced into the exhaust stream when the exhaust stream has a temperature at or above the threshold temperature.