Research progress on the deactivation mechanism and deactivation inhibition strategy of Rh-based catalysts in exhaust gas treatment

Abstract

With the acceleration of industrialization and the increase in car ownership, exhaust pollution has become a major global environmental challenge. Harmful gases such as carbon monoxide (CO) and nitrogen oxides (NO_x) are discharged into the air, forming acid rain, producing chemical smog, and destroying the ozone layer. This causes severe harm to the environment and human health. Rh-based catalysts play a crucial role in exhaust gas treatment due to their excellent performance in selective catalytic reduction (SCR) and direct nitrogen oxide decomposition (DND) of NO_x. However, deactivation limits their stability and service life, increasing costs and restricting industrial application. This paper reviews the reaction mechanisms of Rh-based catalysts in SCR and DND reactions, discusses deactivation mechanisms, and proposes improvement strategies. It provides theoretical basis and practical guidance for the development of efficient and stable catalysts for exhaust gas treatment.