Investigation of the by-product selectivity of industrialized support for the catalytic elimination of o-DCB over Pt-catalysts

Abstract

For chlorinated volatile organic compounds (CVOCs), it is critical to design and fabricate applicable noble metal catalysts to exhibit superior catalytic performance in catalytic oxidation under both dry air and 5.0 vol% H₂O conditions. In pursuit of this goal, a facile strategy was developed to prepare a series of Pt-supported catalysts for the elimination of o-dichlorobenzene (o-DCB). Among these catalysts, Pt/CeAlZrO_x possessed excellent activity (T₉₀ = 285 °C) and Pt/LaAlO_x showed outstanding selectivity within/without 5.0 vol% H₂O, attributed to the strong interaction of multi-components, abundance of adsorbed oxygen, prominent redox properties, and suitable acidity. According to the analysis results of density functional theory (DFT), the introduction of Pt can significantly improve the adsorption and activation of o-DCB molecules on the catalysts. Specifically, the action of Marse-van Krevelen (MvK) combining with Langmuir-Hinshelwood (L-H) mechanism was proposed. In general, this work provides promising candidates and valuable insights into the comprehensive improvement of o-DCB catalytic degradation for industrial application.