Room temperature oxidation of acetone by ozone over alumina-supported manganese and cobalt mixed oxides
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RESEARCH ARTICLE
Room temperature oxidation of acetone by ozone over alumina-supported manganese and cobalt mixed oxides Mehraneh Ghavami1, Mostafa Aghbolaghy1, Jafar Soltan (✉)1, Ning Chen1,2 1 Department of Chemical and Biological Engineering, University of Saskatchewan, Saskatoon, S7N 5A9, Canada 2 Canadian Light Source Inc., University of Saskatchewan, Saskatoon, S7N 0X4, Canada
© Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Volatile organic compounds (VOCs) are among the major sources of air pollution. Catalytic ozonation is an efficient process for removing VOCs at lower reaction temperature compared to catalytic oxidation. In this study, a series of alumina supported single and mixed manganese and cobalt oxides catalysts were used for ozonation of acetone at room temperature. The influence of augmenting the single Mn and Co catalysts were investigated on the performance and structure of the catalyst. The manganese and cobalt single and mixed oxides catalysts of the formula Mn10%-CoX and Co10%MnX (where X = 0, 2.5%, 5%, or 10%) were prepared. It was found that addition of Mn and Co at lower loading levels (2.5% or 5%) to single metal oxide catalysts enhanced the catalytic activity. The mixed oxides catalysts of (Mn10%-Co2.5%) and (Mn10%-Co5%) led to acetone conversion of about 84%. It is concluded that lower oxidation state of the secondary metal improves ozone decomposition and oxidation of acetone. Keywords ozone, VOC, manganese oxides, cobalt oxides, alumina support
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Introduction
Air pollution by volatile organic compounds (VOCs) is an environmental threat that can negatively affect human health [1,2]. Ozone is considered a strong oxidant for water treatment and air cleaning [3,4]. Catalytic reaction with ozone (catalytic ozonation) is a promising method for VOC removal with distinct advantages over catalytic oxidation processes. Important advantages of catalytic ozonation are oxidation of VOCs at lower temperature, the Received May 29, 2019; accepted September 11, 2019 E-mail: [email protected]
possibility of using transition metal oxides catalysts instead of noble metals, and effectiveness of the process at low concentration levels of the VOC [5–8]. Transition metal oxides such as Mn, Co, Cu, Ni, Fe, and Ce are among the most active metals in catalytic ozonation reactions [9]. Supported manganese oxides are the most effective catalysts for oxidation of VOCs with ozone [10– 13]. It has been reported that high activity of MnOx in the oxidation of VOCs can be related to the activity of Mn in decomposition of ozone and generation of active oxygen species [14]. VOC removal rates normalized by catalyst surface area were determined to be higher for aluminasupported catalysts than titania, silica, or zirconiasupported catalysts [15]. Investigation on catalytic ozonation of acetone using supported manganese oxide catalyst on γ-alumina and silica showed that alumina-supported catalyst was more active than the silica-supported catalyst in acetone removal [10].
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