An Ir And Flow Reactor Study Of Chloroform Oxidation Over Manganese Oxides

Abstract

− A series of manganese base oxides (MnCe, MnZr and MnCeZr) obtained by coprecipitation, were characterized by SBET, XRD, TPR, XPS and studied by FTIR in the oxidation reaction of a typical Cl-VOC such as chloroform, CHCl3. The oxides were compared with a manganese oxide obtained from the recycling of spent batteries (MnOx). In addition, the catalytic combustion of CHCl3 in a fixed-bed reactor was analyzed and the CHCl3 conversion decreased in the order: MnZr > MnOx = MnCeZr >MnCe. In all cases, the conversion is higher than that obtained without a catalyst. The surface Mn4+/Mn3+ ratio would favor the decomposition of Cl-VOC. The study of CHCl3 reaction atmosphere by in situ IR reveals that in the absence of catalysts, CCl4, COCl2, C2Cl4 and CH2Cl2 were observed. On the other hand, C2Cl4 is not formed in the presence of catalysts, although CCl4 and CH2Cl2 were observed and must be avoided.