查看文章

This short review concerns the efficient catalysts for HC-SCR discovered more than 20 years ago. In 1990, Iwamoto proposed Cu ion-exchanged ZSM-5, and it was the first powerful catalyst for HC-SCR. This paper presents first metal ion-exchanged zeolites and the influence of various parameters on the catalysts activities (acidity, O₂ content, etc.). In the second part, this paper reviews supported metal catalysts, base metal oxides, hybrid catalysts and the possible reducing agents to remove NO_x. It can be inferred that the most active catalysts for HC-SCR should have acidic sites, an active phase like copper or cobalt, or for a wider activity, elements such as silver or a mixture of metals. For low deactivation, they should contain noble metals such as platinum, rhodium or tin.