AN IR AND FLOW REACTOR STUDY OF CHLOROFORM OXIDATION OVER MANGANESE OXIDES

  • Maria V Gallegos, PhD CINDECA (CONICET-UNLP-CICPBA)
  • Gabriela Garbarino, PhD Dipartimento di IngegneriaCivile, Chimica e Ambientale, Università di Genova
  • Jorge Esteban Colman Lerner, PhD CINDECA (CONICET-UNLP-CICPBA)
  • Elisabetta Finocchio, PhD Dipartimento di IngegneriaCivile, Chimica e Ambientale, Università di Genova
  • Guido Busca, PhD Dipartimento di IngegneriaCivile, Chimica e Ambientale, Università di Genova
  • Jorge Enrique Sambeth, PhD CINDECA (CONICET-UNLP-CICPBA)
  • Miguel Angel Peluso, PhD CINDECA (CONICET-UNLP-CICPBA)
Keywords: manganese, chloroform, CI-VOC, FTIR

Abstract

A series of manganese base oxides (MnCe, MnZr and MnCeZr) obtained by co-precipitation, were characterized by SBET, XRD, TPR, XPS and studiedby FTIR in the oxidation reaction of a typical Cl-VOC such as chloroform, CHCl3. The oxides were compared with a manganeseoxide 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

Published
2021-03-19