Boosting VOCs elimination by coupling different techniques

Abstract

Volatile Organic Compounds (VOCs) are known to be hazardous and harmful to human health and the environment. In mixtures or during repeated exposures, significant toxicity of these compounds in trace amounts has been revealed. In vitro air-liquid interface approaches underlined the interest in evaluating the impact of repeated VOC exposure and the importance of carrying out a toxicological validation of the techniques in addition to the standard chemical analyses. The difficulties in sampling and measuring VOCs in stationary source emissions are due to both the complexity of the mixture present and the wide range of concentrations. The coupling of VOC treatment techniques results in efficient systems with lower operating energy consumption. Three main couplings are outlined in this review, highlighting their advantages and relevance. First, adsorption-catalysis coupling is particularly valuable by using adsorption and catalytic oxidation regeneration initiated, for example, by selective dielectric heating. Then, several key aspects of the plasma catalysis process, such as the choice of catalysts suitable for the non-thermal plasma (NTP) environment, the simultaneous removal of different VOCs, and the in situ regeneration of the catalyst by NTP exposure, are discussed. The adsorption-photocatalysis coupling technology is also one of the effective and promising methods for VOC removal. The VOC molecules strongly adsorbed on the surface of the photocatalyst can be directly oxidized by the photogenerated hole on the photocatalyst (e.g., TiO2).

Optimization of Mn‐Mg‐Al Mixed Oxides Composition on their Activity towards the Total Oxidation of Aromatic and Oxygenated VOCs

“…Many methods have been developed to eliminate VOCs, with catalytic oxidation gaining popularity due to its low cost, high activity, and non-hazardous byproducts. [3,4] Selecting a suitable catalyst is crucial in the catalytic oxidation process. Therefore, the choice of the active phase and support is important to optimize the catalytic activity, its long-term performance, and its cost.…”

“…However, this fundamental strategy is not always economically appropriate, and thus, secondary procedures for VOCs treatment must be employed. Many methods have been developed to eliminate VOCs, with catalytic oxidation gaining popularity due to its low cost, high activity, and non‐hazardous byproducts [3,4] . Selecting a suitable catalyst is crucial in the catalytic oxidation process.…”

Catalytic Oxidation of Volatile Organic Compounds Alone or in Mixture over Mg4Al2−xCex Mixed Oxides

“…This technology operates at low temperatures and is cost-effective, producing carbon dioxide and water as the end products. Precious metals, metal oxides, and mixed metal oxides are commonly used catalysts for this method of VOCs removal [1][2][3][4][5]. Precious metals like platinum or palladium exhibit greater activity than metal oxide; however, they are costly and subject to sintering and poisoning [6].…”