Journal
CATALYSIS TODAY
Volume 375, Issue -, Pages 623-634Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2019.12.011
Keywords
Titania; Transition metal oxide; Supported catalyst; Chlorinated volatile organic compound; 1; 2-Dichloroethane oxidation
Funding
- National Natural Science Foundation of China [21677004, 21876006, 21607005, 21622701, U1507108]
- Foundation on the Creative Research Team Construction Promotion Project of Beijing Municipal Institutions [IDHT20190503]
- Scientific Research Base Construction-Science and Technology Creation Platform-National Materials Research Base Construction
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Transition metal oxides (MOx)-doped titania solid solution catalysts were prepared and characterized for the oxidation of 1,2-dichloroethane. Among them, 10CrOx-TiO2 exhibited the highest catalytic activity and resistance to chlorine poisoning, attributed to strong acidity, redox ability, high adsorbed oxygen species concentration, and strong interaction between TiO2 and CrOx.
Transition metal oxides (MOx; M = Cr, Mn, Fe, Ni, Cu)-doped titania solid solution catalysts (10 wt% MOx-TiO2, denoted as 10MOx-TiO2) were prepared by the coprecipitation method. The techniques of XRD, TPR, TPD, XPS, TPSR, and in situ DRIFTS were used to characterize physicochemical properties of the materials, and their catalytic activities were evaluated for the oxidation of 1,2-dichloroethane (1,2-DCE). The introduction of MOx enhanced adsorption and activation of oxygen molecules, mobility of surface lattice oxygen, and lowtemperature reducibility. The 10MOx-TiO2 catalysts showed good performance, with 10CrOx-TiO2 exhibiting the highest catalytic activity (reaction rate = 2.35 x 10-7 mol/(gcat s) and apparent activation energy (Ea) =35 kJ/mol at space velocity = 40,000 mL/(g h)) and good resistance to chlorine poisoning, The mechanism of 1,2-DCE oxidation over 10CrOx-TiO2 was also discussed based on the results of TPSR and in situ DRIFTS characterization. It is concluded that strong acidity and redox ability, high adsorbed oxygen species concentration, and strong interaction between TiO2 and CrOx were accountable for the good performance of 10CrOx-TiO2.
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