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Browsing by Subject "Oxygen storage capacity"

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    • Article  

      Deactivation of Pd/Ce 0.5Zr 0.5O 2 model three-way catalyst by P, Ca and Zn deposition 

      Christou, Stavroula Y.; García-Rodríguez, S.; Fierro, José Luis García; Efstathiou, Angelos M. (2012)
      The negative effects of P, P-Ca and P-Zn deposition on the surface of a model 1wt% Pd/Ce 0.5Zr 0.5O 2 " three-way" catalyst (TWC) on its structural, morphological, textural, oxygen storage and release, and catalytic ...

    • Article  

      Dynamics of oxygen storage and release on commercial aged Pd-Rh three-way catalysts and their characterization by transient experiments 

      Lambrou, Panayiota S.; Costa, Costas N.; Christou, Stavroula Y.; Efstathiou, Angelos M. (2004)
      The present work has provided new fundamental information on the effects of aging (mileage, km) of a commercial Pd-Rh (9:1, w/w) three-way catalyst (TWC) on (a) the H 2 chemisorption, (b) the redox properties of washcoat ...

    • Article  

      The effects of P-poisoning of CexZr1-xO2 on the transient oxygen storage and release kinetics 

      Christou, Stavroula Y.; Efstathiou, Angelos M. (2013)
      The present work reports on the investigation of the effects of chemical poisoning of CexZr1-xO2 solids by phosphorous (P) on the kinetics of oxygen storage and release (OSR) of the thus derived P-contaminated solids, as ...

    • Article  

      Low-temperature conversion of phenol into CO, CO 2 and H 2 by steam reforming over La-containing supported Rh catalysts 

      Constantinou, D. A.; álvarez-Galván, M. C.; Fierro, José Luis García; Efstathiou, Angelos M. (2012)
      The steam reforming of phenol in the low-temperature range of 350-550°C was studied over 0.5wt% Rh supported on Ce 0.15Zr 0.85O 2, Zr 0.93La 0.07O 2, and Ce 0.13Zr 0.83La 0.04O 2 mixed metal oxides. The reforming specific ...

    • Article  

      Mathematical modeling of the oxygen storage capacity phenomenon studied by CO pulse transient experiments over Pd/CeO2 catalyst 

      Costa, Costas N.; Christou, Stavroula Y.; Georgiou, Georgios C.; Efstathiou, Angelos M. (2003)
      A mathematical model has been developed for the first time to study the oxygen storage capacity (OSC) phenomenon by the CO pulse injection technique over a 1 wt% Pd/CeO2 model catalyst in the 500-700°C range. A two-step ...

    • Article  

      Mathematical modeling of the oxygen storage capacity phenomenon studied by CO pulse transient experiments over Pd/CeO2 catalystAAA 

      Costa, Costas N.; Christou, Stavroula Y.; Georgiou, Georgios C.; Efstathiou, Angelos M. (2003)
      A mathematical model has been developed for the first time to study the oxygen storage capacity (OSC) phenomenon by the CO pulse injection technique over a 1 wt% Pd/CeO2 model catalyst in the 500-700°C range. A two-step ...

    • Article  

      Nucleation of isolated PO4 units on CeO2 driven by high temperatures and the effect on its oxygen storage and release properties 

      López Granados, M.; Cabello Galisteo, F.; Lambrou, Panayiota S.; Alifanti, M.; Mariscal, R.; Gurbani, A.; Sanz, J.; Sobrados, I.; Efstathiou, Angelos M.; Fierro, José Luis García (2007)
      The chemical nature of P-containing species of varying concentration present in CeO2 after impregnation with (NH4)2HPO4 and calcination at 1273 K, and their effects on the oxygen storage and release (OSR) properties of ...

    • Article  

      Oxy-chlorination as an effective treatment of aged Pd/CeO 2-Al 2O 3 catalysts for Pd redispersion 

      Lambrou, Panayiota S.; Polychronopoulou, Kyriaki; Petallidou, Klito C.; Efstathiou, Angelos M. (2012)
      The present work reports on the effects of oxy-chlorine gas treatment (use of Cl 2/O 2/He gas mixture) applied on a 5wt% Pd/20wt% CeO 2-Al 2O 3 catalyst towards Pd redispersion. X-ray diffraction (XRD), X-ray photoelectron ...

    • Article  

      Reactivation of severely aged commercial three-way catalysts by washing with weak EDTA and oxalic acid solutions 

      Christou, Stavroula Y.; Birgersson, H.; Efstathiou, Angelos M. (2007)
      Ethylene diamine tetraacetic acid (EDTA) which is a well-known reagent for its metal extraction efficiency was studied for the first time towards the improvement of the catalytic activity and oxygen storage and release ...

    • Article  

      Structural and Redox Properties of Ce1-xZrxO2-δ and Ce0.8Zr0.15RE0.05O2-δ (RE: La, Nd, Pr, Y) Solids Studied by High Temperature in Situ Raman Spectroscopy 

      Andriopoulou, Chrysanthi; Trimpalis, Antonios; Petallidou, Klito C.; Sgoura, Anna; Efstathiou, Angelos M.; Boghosian, Soghomon (2017)
      In situ Raman spectroscopy at temperatures up to 450 °C is used to probe the structural and redox properties of Ce1-xZrxO2-δ solids (x = 0-0.8) prepared by the citrate sol-gel and coprecipitation with urea methods. The ...

    • Article  

      A two-step reaction mechanism of oxygen release from Pd/CeO2: Mathematical modelling based on step gas concentration experiments 

      Christou, Stavroula Y.; Costa, Costas N.; Efstathiou, Angelos M. (2004)
      A mathematical model was developed to study the transient release of oxygen from a 1 wt % Pd/CeO2 catalyst in the 450°-550°C range based on alternate step concentration switches between CO and O2. The proposed mathematical ...

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