Abstract
Due to its excellent oxygen storage capacity, ceria is a well-known oxidation catalyst. However, its performance in the oxidation of volatile organic compounds can be improved by the introduction of gold. Depending on the type of VOC to be oxidized, the surface of gold nanoparticles and the gold/ceria interface may contribute to enhanced activity and/or selectivity. Choosing a proper preparation method is crucial to obtain optimal gold particle size. Deposition–precipitation was found to be more suitable than coprecipitation or impregnation. For industrial applications, monolithic catalysts are needed to minimize the pressure drop in the reactor and reduce mass and heat transfer limitations. In addition to the approach used with powder catalysts, the method employed to introduce gold in/on the washcoat has to be considered.
Highlights
Volatile organic compounds (VOCs) are organic compounds having an initial boiling point of less than 250 ◦C measured at a standard atmospheric pressure of 101.3 kPa, which participate in atmospheric photochemical reactions [1].VOCs are harmful to the environment and human health
Another catalyst compositions useful for destruction of VOCs in an oxygen-containing gas stream at low temperatures comprises one or more first metals selected from the group consisting of: Ce and Zr; and at least one of: (a) one or more second metals selected from the group consisting of: Gd, La, Sr and Sc; (b) one or more third metals selected from the group consisting of: Ti, V, Mn, Fe, Co, Cr, Ni, Au, Ag and Cu; and (c) one or more fourth metals selected from the group consisting of Pt, Pd, Rh, Ru, Re, Os and Ir
Gold and ceria are well-known catalysts that already proved their performance in the total oxidation of VOCs
Summary
Volatile organic compounds (VOCs) are organic compounds having an initial boiling point of less than 250 ◦C measured at a standard atmospheric pressure of 101.3 kPa, which participate in atmospheric photochemical reactions [1]. Noble metal catalysts possess greater activity than oxide catalysts, contributing to the reduction of operating costs despite their higher manufacturing cost. Gold-based catalysts attract increasing attention [32] They have proved a beneficial role in various catalytic reactions of commercial and environmental status, e.g., exhaust gas purification, oxidation of glucose, water gas shift, CO oxidation, water or hydrogen purification, air cleaning, fuel cells and VOC oxidation. It contributes to the control of the final amount, the size and the shape of gold particles, influencing the activity of material in VOC oxidation. According to Scirеand Liotta [67], VOC deep oxidation over Au/metal oxide catalysts is governed by both the support and gold properties, which often amplify their effects due to a synergistic action. The Au–Pd is one of the core–shell systems that have gained considerable attention [53,77]
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