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• W2022374276 startingPage "2826" @default.
• W2022374276 abstract "The gas-phase catalytic hydrodechlorination (CHD) of dichloromethane (DCM), tetrachloroethylene (TTCE), and chloroform (CF) and their mixtures was studied over Pd/TiO2-washcoated cordierite minimonoliths. Experiments were carried out in a flow reactor at 120−300 °C, 1 bar, and 0.45 g min/mL. Catalytic runs with the pure compounds at 200 °C led to 60−100% conversion following the sequence CF > TTCE > DCM. Catalyst deactivation and regeneration were also examined. Lower conversions (between 30% and 95%) and catalyst deactivation were observed when mixtures of organochlorinated compounds where fed as reactants. DCM was the most affected when binary and ternary mixtures were used. Catalyst samples were characterized before and after reaction by various temperature-programmed studies (H2 TPR, He TPD, NH3 TPD, and TPO), H2 chemisorption, and XPS measurements. Most characterization studies were carried out using an online coupled mass spectrometer, thus allowing the parallel detection of different fragments and species corresponding to several hydrocarbons and HCl. In some experiments, a fast GC−ToF−MS system was used. The catalytic activity of spent samples was partially recovered by heating them in flowing air and then in 5% H2/N2. However, the initial reaction rate decreased by 62% over samples used in three consecutive runs when ternary mixtures were fed. Carbonaceous deposits of different nature and changes in the oxidation state of Pd (Pd0 to Pd2+ and Pd4+) appear to play key roles in catalyst deactivation, whereas acidity was found to remain almost the same for fresh and used catalyst samples. Carbonaceous deposits were removed by heating at temperatures lower than 400 °C in flowing air." @default.
• W2022374276 created "2016-06-24" @default.
• W2022374276 creator A5005570793 @default.
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• W2022374276 creator A5035027953 @default.
• W2022374276 creator A5044350321 @default.
• W2022374276 date "2009-02-05" @default.
• W2022374276 modified "2023-09-28" @default.
• W2022374276 title "Hydrodechlorination of Light Organochlorinated Compounds and Their Mixtures over Pd/TiO₂-Washcoated Minimonoliths" @default.
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• W2022374276 doi "https://doi.org/10.1021/ie8013742" @default.
• W2022374276 hasPublicationYear "2009" @default.
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