A critical review comparing catalytic ozone decomposition with catalytic ozonation of VOCs

Abstract

Both Ozone (O₃) and volatile organic compounds (VOCs) pose substantial risks to human health and ecosystems. Catalytic decomposition of O₃ and catalytic ozonation of VOCs are effective degradation strategies. This review elucidates the mechanisms underlying catalytic O₃ decomposition and catalytic ozonation of VOCs, while simultaneously establishing the interconnections between these two processes. This review comprehensively delineates the catalysts and control methodologies pertinent to both catalytic O₃ decomposition and catalytic ozonation of VOCs, endeavoring to draw parallels between the catalysts employed in these processes. Transition metals, with their versatile valence states and rich electronic structures, exhibit remarkable efficacy in catalytic O₃ decomposition and catalytic ozonation of VOCs. Modulating surface structure and concentration of oxygen vacancies emerges as the powerful regulatory strategies. Although the approach to enhancing catalytic ozonation of VOCs parallels that of catalytic O₃ decomposition, the intricate environmental context of VOCs necessitates increased focuses on selective adsorption during the initial adsorption phase of the catalyst. Furthermore, a meticulous examination of catalyst stability, especially in relation to resistance against water, sulfur, and chlorine, is imperative. Reactive oxygen species act as pivotal active agents in the catalytic ozonation of VOCs, highlighting the strategic importance of screening catalysts that can generate reactive oxygen species from catalytic O₃ decomposition to expedite the degradation of VOCs.

Graphical abstract

Keywords

Catalytic ozonation / Volatile organic compounds (VOCs) / Ozone (O₃) / Ozone decomposition / Transition metals

Highlight

	● The mechanisms of catalytic ozone decomposition and VOC ozonation were clarified.
	● Catalytic ozone decomposition and ozonation share the same rate-limiting steps.
	● Ozone decomposes at oxygen vacancies, yielding atomic oxygen and O2.
	● Water resistance is a crucial factor for both ozone decomposition and VOC ozonation.
	● Key strategies are modulating surface structure and oxygen vacancy concentration.

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