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Browsing by Subject "Oxidation"

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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  

      Development of a Reliable Analytical Protocol for the Isolation of Cholesterol Oxidation Products—a Comparison of Different Lipid Extraction and Saponification Methods 

      Constantinou, Michalis S.; Georgiou, Christiana A.; Kapnissi‐Christodoulou, Constantina P. (2015)
      The main objectives of this study were (i) the optimization and the validation of a high performance liquid chromatographic method for the simultaneous determination of seven cholesterol oxidation products (COPs), (ii) the ...

    • 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 effect of Fe on the catalytic behavior of model Pd-Rh/CeO2-Al2O3 three-way catalyst 

      Lambrou, Panayiota S.; Savva, Petros G.; Fierro, José Luis García; Efstathiou, Angelos M. (2007)
      The present work attempts to address the issue whether iron (Fe) which is accumulated on the surface of "three-way" catalysts (TWCs) used in gasoline-driven cars is a true chemical poison of their catalytic activity. This ...

    • Article  

      Fourier transform infrared evidence for a ferric six-coordinate nitrosylheme b3 complex of cytochrome cbb3 oxidase from Pseudomonas stutzeri at ambient temperature 

      Stavrakis, Stavros; Pinakoulaki, Eftychia; Urbani, A.; Varotsis, Constantinos (2002)
      We report the first vibrational study of NO bound to an oxidized heme-copper oxidase. Cytochrome cbb3 oxidase from P. stutzeri reduces both O2 and NO to H2O and N2O, respectively. The ferric nitrosyl complex of cbb3 exhibits ...

    • Article  

      Inelastic electron tunneling erases coupling-pathway interferences 

      Skourtis, Spiros S.; Waldeck, D. H.; Beratan, David N. (2004)
      Theoretical analysis of nonadiabatic electron-transfer reactions in molecules usually assumes that electron amplitude propagates coherently from the reductant to the oxidant via covalent and noncovalent coupling pathways. ...

    • Doctoral Thesis  Open Access

      Investigating the solar-driven advanced chemical oxidation of ofloxacin and trimethoprim in sewage and other aqueous matrices 

      Michael, Irene (Πανεπιστήμιο Κύπρου, Πολυτεχνική Σχολή / University of Cyprus, Faculty of Engineering, 2012-05)
      Βασικό αντικείμενο της παρούσης έρευνας αποτέλεσε σε αρχικό στάδιο η εφαρμογή δύο προχωρημένων μεθόδων οξείδωσης, αξιοποιώντας ως πηγή φωτός την ηλιακή ακτινοβολία, για την αποικοδόμηση δύο αντιβιοτικών ενώσεων που περιέχονται ...

    • Article  

      Kinetics of methane oxidative coupling on zinc-doped titanium oxide 

      Efstathiou, Angelos M.; Boudouvas, D.; Vamvuka, Despina; Verykios, Xenophon E. (1992)
      A kinetic study of methane conversion to C2-hydrocarbons was conducted by cofeeding methane and oxygen at 1 bar total pressure over a series of zinc-doped TiO2 catalysts. The zinc dopant concentration was varied between 1 ...

    • Article  

      Low temperature growth of In 2O 3 and InN nanocrystals on Si(111) via chemical vapour deposition based on the sublimation of NH 4Cl in In 

      Zervos, Matthew; Tsokkou, Demetra; Pervolaraki, Maria; Othonos, Andreas S. (2009)
      Indium oxide (In 2O 3) nanocrystals (NCs) have been obtained via atmospheric pressure, chemical vapour deposition (APCVD) on Si(111) via the direct oxidation of In with Ar:10% O 2 at 1000 °C but also at temperatures as low ...

    • Article  

      Low temperature growth of In 2O 3 and InN nanocrystals on Si(111) via chemical vapour deposition based on the sublimation of NH 4Cl in In 

      Zervos, Matthew; Tsokkou, D.; Pervolaraki, M.; Othonos, A. (2009)
      Indium oxide (In 2O 3) nanocrystals (NCs) have been obtained via atmospheric pressure, chemical vapour deposition (APCVD) on Si(111) via the direct oxidation of In with Ar:10% O 2 at 1000 °C but also at temperatures as low ...

    • Article  

      Low-temperature H2-SCR of NO on a novel Pt/MgO-CeO2 catalyst 

      Costa, Costas N.; Efstathiou, Angelos M. (2007)
      The selective catalytic reduction of NO by H2 under strongly oxidizing conditions (H2-SCR) in the low-temperature range of 100-200 °C has been studied over Pt supported on a series of metal oxides (e.g., La2O3, MgO, Y2O3, ...

    • Article  

      Mixed Transition-Metal - Lanthanide Complexes at Higher Oxidation States: Heteronuclear CeIV-MnIV Clusters 

      Tasiopoulos, Anastasios J.; O'Brien, T. A.; Abboud, K. A.; Christou, George (2004)
      Wheels within wheels: A new family of mixed cerium(IV)-manganese(IV) clusters has been prepared spanning a range of Ce:Mn ratios from 3:2 to 1:6. The unusual core of the latter CeMn6 complex is shown (Ce green, Mn blue, O ...

    • Doctoral Thesis  Open Access

      New chemistry of azaacenes 

      Zissimou, Georgia A. (Πανεπιστήμιο Κύπρου, Σχολή Θετικών και Εφαρμοσμένων Επιστημών / University of Cyprus, Faculty of Pure and Applied Sciences, 2019-05)
      Η παρούσα Διδακτορική Διατριβή αρχίζει με μια σύντομη εισαγωγή (Κεφάλαιο 1) στην ετεροκυκλική χημεία και εμβαθύνει στη σύνθεση, τις ιδιότητες και την οξειδωτική σταθερότητα των ακενίων και των αζακενίων. Στο Κεφάλαιο 2 ...

    • Article  

      Observation of ligand transfer in ba 3 oxidase from thermus thermophilus: Simultaneous FTIR detection of photolabile heme a 3 2+-CN and transient CuB 2+-CN complexes 

      Loullis, Andreas; Noor, M. R.; Soulimane, T.; Pinakoulaki, Eftychia (2012)
      FTIR and light-minus-dark FTIR spectroscopy have been employed to investigate the reaction of oxidized and fully reduced ba3 oxidase with cyanide. The characterization of the structures of the bound CN- in the binuclear ...

    • 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  

      The preparation and adsorptive properties of ammonia-activated viscose rayon chars 

      Tomlinson, J. B.; Freeman, J. J.; Theocharis, Charis R. (1993)
      Viscose rayon chars have been activated in ammonia under varying conditions in order to investigate whether the presence of N-containing groups in the char structure led to a limitation of pore development in the micropore ...

    • Article  

      Rainwater characteristics over an old sulphide mine refuse in Sha, Cyprus 

      Charalambides, Antonios; Petrides, Georgios; Pashalidis, Ioannis (2003)
      Rainwater characteristics over an old mining area have been investigated on the basis of long-term sample collection and determination of physical parameters and chemical composition. The experimental data, which were ...

    • Article  

      Reforming of methane with carbon dioxide to synthesis gas over supported Rh catalysts 

      Tsipouriari, Vaso A.; Efstathiou, Angelos M.; Zhang, Z. L.; Verykios, Xenophon E. (1994)
      Reforming of methane with carbon dioxide to synthesis gas (CO/H2) has been investigated over rhodium supported on SiO2, TiO2, γ-Al2O3, MgO, CeO2, and YSZ (ZrO2 (8 mol% Y2O3)) catalysts in the temperature range of 650-750°C ...

    • Article  

      Resonance raman spectroscopy of nitric oxide reductase and cbb3 Heme-Copper oxidase 

      Pinakoulaki, Eftychia; Varotsis, Constantinos (2008)
      Elucidating the structure and properties of the active sites in cbf 3 heme-copper oxidase and in nitric oxide reductase (Nor) is crucial in understanding the reaction mechanisms of oxygen and nitric oxide reduction by both ...

    • Article  

      Sample preparation: A critical step in the analysis of cholesterol oxidation products 

      Georgiou, Christiana A.; Constantinou, Michalis S.; Kapnissi‐Christodoulou, Constantina P. (2014)
      In recent years, cholesterol oxidation products (COPs) have drawn scientific interest, particularly due to their implications on human health. A big number of these compounds have been demonstrated to be cytotoxic, mutagenic, ...

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