Catalytic abatement of CO, HCs and soot emissions over spinel-based catalysts from diesel engines: An overview

Abstract

The incomplete combustion from diesel-fuel engines generates airborne species such as CO, HCs, NOx and soot of health concern necessitate the need of understanding of work done in the area of emission control systems. Among noble metal free catalysts, spinel oxides have been found to be highly efficient for CO, HCs and soot oxidation. Here, we review the main fundamental understanding of the correlations between the catalytic activity of spinel structures and their chemical composition, and morphology. In addition, the key factors and essential strategies to improve their activity and stability are discussed in detail. Future research pathways and perspectives on the progress of the spinel formulations are provided with a focus on high performance and cost-effective spinel formulation having good potential of replacing commercially noble metals in use. It is envisioned that further investigations should focus on high potential multicomponent spinel oxide solid solutions, accelerated deactivation tests to examine applied application, and integrating conductive matrixes to avoid structural lapses under practical conditions. © 2020 Elsevier Ltd