Heterogeneous Catalytic Ozonation over Metal Oxides and Mechanism Discussion

Abstract

In this chapter, the adoption of different metal oxides, including typical transition metal oxides (manganese, iron and cobalt oxides), other single-metal oxides (aluminum, titanium, magnesium and calcium oxides) and mixed metal oxides (perovskites and spinel oxides), as heterogeneous ozonation catalysts is summarized. The relationship between the characteristics of these catalysts and their catalytic activities and ozonation efficiencies has been elaborated in each section, such as their component, structure, and morphology. More attention has been paid to the demonstration of ozonation efficiency, the involved reactive oxygen species, active centers for catalytic ozone decomposition, and the surface reaction process. In addition, the effects of surface-active sites that existed in diverse metal oxides on their catalytic capabilities and ozonation mechanism are discussed after being outlined to better explore the relationship between ozonation catalysts and catalytic capabilities. An in-depth understanding of the catalytic ozonation mechanisms is beneficial as the guidance for the following design of ozonation catalysts.