Research progress on modification of Cu-SSZ-13 catalyst for denitration of automobile exhaust gas

Cu-SSZ-13 is an excellent deNOx catalyst with CHA skeleton structure, and thus it possesses good application prospect in the field of vehicle exhaust deNOx and has been applied commercially in Europe. However, the hydrothermal deactivation and sulfur poisoning of Cu-SSZ-13 will cause serious damage to the CHA skeleton structure and active sites of Cu-SSZ-13 and has limited its development. In order to solve these problems, the modification of Cu-SSZ-13 catalyst has become the focus of current research. The recent research progress on the active sites of Cu-SSZ-13 catalyst and the mechanism of its deactivation caused by hydrothermal aging and sulfur poisoning were summarized. Also, the latest modification methods aimed at improving the catalytic activity and tolerance of Cu-SSZ-13, such as creating new nanostructures, constructing poisoning sacrifice sites, metal doping modification, were discussed, which provides a new thought for enhancing the catalytic performance and anti-poisoning performance of Cu-SSZ-13. Furthermore, the future development of Cu-SSZ-13 modification technology was prospected with the innovative idea of regulation of the active site by specific metal doping and novel preparation methods to control the type of ions in the zeolite. Finally, the essential problems to be solved in catalyst modification were discussed. © 2023 Chemical Industry Press. All rights reserved.