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Kinetics and Selectivity of Gaseous Benzene and Formaldehyde Binary Mixture in Annular Circulated Photocatalytic Reactor


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Abstract


A photocatalytic oxidation in CPCR was investigated for the kinetics and selectivity of formaldehyde and/or benzene. The Langmuir-Hinshelwood approach has been applied for modeling the photocatalytic degradation data, and the kinetic model parameters have been determined. The influences of formaldehyde, benzene concentrations, and proportions in the binary mixture on the adsorption, degradation, kinetics and selectivity in CPCR were studied, where the selective coefficient discussed based on the adsorption characteristics of catalyst, reaction kinetics characteristics of substrates and ability of scavenging radicals or electrons. The results showed that the selectivity of photocatalytic oxidation of benzene and formaldehyde occurred in the binary mixture. The theoretical values were approximate to the experimental data using the ratio of degradation efficiency at the initial stage. Also, the selectivity equation is applied successfully at the initial stage of photocatalysis, which contributes to a better understanding of the selective mechanism of photocatalytic oxidation of binary mixture.
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Keywords


Photocatalytic Degradation; Binary Mixture; Annular Circulated Photocatalytic Reactor; Kinetics; Selectivity

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References


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