Kinetic Analysis on As(III) Oxidation in a Fixed-Bed Flow Reactor Filled with a Supported Platinum Catalyst

In this study, the oxidation of As(III) was examined in a fixed-bed flow reactor filled with a SiO2-supported Pt catalyst, and the reaction kinetics were analyzed. The results of the experiments with different concentrations of As(III) at small W/F suggest that the reaction follows the Langmuir-Hins...

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Bibliographic Details
Published inJournal of chemical engineering of Japan Vol. 56; no. 1
Main Authors Kondo, Hiromichi, Oshima, Kazumasa, Yamamoto, Tsuyoshi, Kishida, Masahiro
Format Journal Article
LanguageEnglish
Published Tokyo Taylor & Francis Group 31.12.2023
Subjects
As(III) oxidation
Catalysts
Dissolved oxygen
Kinetic equations
Oxidation
Plug-flow reactor
Pt catalyst
Reaction kinetic analysis
Reaction kinetics
Reactors
Silicon dioxide
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Summary:In this study, the oxidation of As(III) was examined in a fixed-bed flow reactor filled with a SiO2-supported Pt catalyst, and the reaction kinetics were analyzed. The results of the experiments with different concentrations of As(III) at small W/F suggest that the reaction follows the Langmuir-Hinshelwood (L-H) mechanism. However, at large W/F, the kinetic equations different from the L-H equation were obtained because the O2 supply to the catalyst surface was rate-limiting. It was also demonstrated using this reactor that As(III) of an equivalent concentration as the mine effluent was almost completely oxidized to As(V) with only dissolved O2.
ISSN:0021-9592
1881-1299
DOI:10.1080/00219592.2023.2212703