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Browsing by Subject "Palladium"

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    • Article  

      1,3-diphenylbenzo[e][1,2,4]triazin-7(1H)-one: Selected chemistry at the C-6, C-7 and C-8 positions 

      Koutentis, Panayiotis Andreas; Krassos, H.; Lo Re, D. (2011)
      1,3-Diphenylbenzo[e][1,2,4]triazin-7(1H)-one (6) reacts with tetracyanoethylene (TCNE) or tetracyanoethylene oxide (TCNEO) to give the deep green 2-[1,3-diphenylbenzo[e][1,2,4]triazin-7(1H)-ylidene]propanedinitrile (11) ...

    • Article  

      Catalytic oxidation of N -phenylamidrazones to 1,3-Diphenyl-1,4-dihydro-1, 2,4-benzotriazin-4-yls: An improved synthesis of blatters radical 

      Koutentis, Panayiotis Andreas; Lo Re, D. (2010)
      Blatters radical, 1,3-diphenyl-1,4-dihydro-1,2,4-benzotriazin-4-yl (1a, R =H), and several of its C-7 substituted analogues (R =CF3, Cl, Br, I, Me, OMe) were prepared in good-to-excellent yields through catalytic oxidation ...

    • Article  

      Catalytic removal of nitrates from waters 

      Constantinou, C. L.; Costa, Costas N.; Efstathiou, Angelos M. (2010)
      The selective catalytic reduction of nitrates (NO3 -) in pure water towards N2 formation by the use of gaseous H2 and in the presence of O2 (air) at 1 atm total pressure and 25 °C has been investigated over Pd-Cu supported ...

    • 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 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  

      Ellipsometry on optically thin palladium films on silicon-based substrate: Effects of low concentration of hydrogen 

      Lioudakis, Emmanouil E.; Othonos, Andreas S. (2005)
      Optically thin palladium films evaporated on silicon substrates are investigated following exposure to low concentrations of hydrogen gas in nitrogen using spectroscopic ellipsometry. Changes in the parameters tan Ψ and Δ ...

    • Article  

      Low temperature and cost-effective growth of vertically aligned carbon nanofibers using spin-coated polymer-stabilized palladium nanocatalysts 

      Saleem, A. M.; Shafiee, S.; Krasia-Christoforou, T.; Savva, I.; Göransson, G.; Desmaris, V.; Enoksson, P. (2015)
      We describe a fast and cost-effective process for the growth of carbon nanofibers (CNFs) at a temperature compatible with complementary metal oxide semiconductor technology, using highly stable polymer-Pd nanohybrid colloidal ...

    • Article  

      New regiospecific isothiazole C-C coupling chemistry 

      Christoforou, Irene C.; Koutentis, Panayiotis Andreas (2006)
      Regioselective palladium catalysed coupling reactions are achieved in good to high yields, starting from either 3,5-dichloro- or 3,5-dibromoisothiazole-4-carbonitriles 1 and 2, providing 3-halo-5-(hetero/aryl, alkenyl and ...

    • Article  

      NO x control via H 2-selective catalytic reduction (H 2-SCR) technology for stationary and mobile applications 

      Polychronopoulou, Kyriaki; Efstathiou, Angelos M. (2012)
      This review paper provides an overview of the use of hydrogen (H 2) gas towards the selective catalytic reduction of nitrogen oxides (NO x) under strongly oxidizing conditions found in many industrial flue gas streams and ...

    • Article  

      Optical response of thin supported palladium films to hydrogen: Non-destructive testing for hydrogen detection 

      Christofides, Constantinos; Kalli, Kyriacos; Othonos, Andreas S. (1999)
      The properties of thin palladium films on silicon dioxide/silicon substrates are investigated. As the electrical properties of very thin palladium films cannot be measured, due to highly discontinuous nature of the films ...

    • Article  

      Optically thin palladium films on silicon-based substrates and nanostructure formation: effects of hydrogen 

      Othonos, Andreas S.; Kalli, Kyriacos; Tsai, D. P. (2000)
      Optically thin palladium films evaporated on different silicon-based substrates are investigated following exposure to different concentrations of hydrogen gas in air. Laser modulated reflectance off the palladium surface ...

    • Article  

      Palladium micellar nanohybrids with tunable nonlinear optical response 

      Papagiannouli, I.; Demetriou, M.; Chatzikyriakos, G.; Iliopoulos, K.; Krasia-Christoforou, T.; Couris, S. (2013)
      In the present work, the third-order nonlinear optical response of two different types of Pd-polymer micellar nanohybrids are investigated using 4 ns, visible and infrared laser excitation. The prepared nanohybrids were ...

    • Article  

      Palladium-based micellar nanohybrids: Preparation and nonlinear optical response 

      Papagiannouli, I.; Demetriou, M.; Krasia-Christoforou, T.; Couris, S. (2014)
      In the present work the synthesis and physicochemical characterisation of a new class of Pd-containing micellar nanohybrid systems are presented. The new systems consist of metallic Pd nanoparticles and well-defined diblock ...

    • Article  

      Preparation and properties of sodium dimethyldithioarsinate dihydrate, Me2AsS2Na-2H2O and palladium(ii) dimethyldithioarsinate, (Me2AsS2)2Pd 

      Ioannou, P. V.; Vachliotis, D. G.; Nastopoulos, Vassilios; Tasiopoulos, Anastasios J. (2009)
      Palladium(II) acetate in non-deaerated chloroform splits Bunsen's cacodyl disulfide, Me2As(S)-S-AsMe2, giving the complex (Me 2AsS2J2Pd, slightly soluble in chloroform, and the arsonium ion Me2As:+. However, after a few ...

    • Article  

      Regiospecific Suzuki coupling of 3,5-dichloroisothiazole-4-carbonitrile 

      Christoforou, Irene C.; Koutentis, Panayiotis Andreas; Rees, C. W. (2003)
      3,5-Dichloroisothiazole-4-carbonitrile 1 reacts with aryl- and methylboronic acids to give in high yields the 3-chloro-5-(aryl and methyl)-isothiazole-4-carbonitrile 2 regiospecifically. The reaction was optimized with ...

    • Article  

      The remarkable effect of oxygen on the N2 selectivity of water catalytic denitrification by hydrogen 

      Constantinou, C. L.; Costa, Costas N.; Efstathiou, Angelos M. (2007)
      The selective catalytic reduction of nitrates (NO3-) in pure water toward N2 formation by the use of gaseous H2 and in the presence of O2 (air) at 1 atm total pressure and 25°C has been investigated over Pd-Cu supported ...

    • Article  

      Synthesis of hybrid polymethacrylate-noble metal (M = Au, Pd) nanoparticles for the growth of metal-oxide semiconductor nanowires 

      Zervos, Matthew; Demetriou, M.; Krasia-Christoforou, T.; Othonos, A.; Turcu, R. P. (2012)
      Metal-oxide semiconductor nanowires (NWs) such as ZnO, β-Ga 2O 3 and SnO 2 with diameters of tens of nanometres and lengths of many micrometres have been grown using micellar nanohybrids consisting of methacrylate-based ...

    • Article  

      Synthesis of hybrid polymethacrylate-noble metal (M = Au, Pd) nanoparticles for the growth of metal-oxide semiconductor nanowires 

      Zervos, Matthew; Demetriou, Maria; Krasia‐Christoforou, Theodora; Othonos, Andreas S.; Turcu, R. P. (2012)
      Metal-oxide semiconductor nanowires (NWs) such as ZnO, β-Ga 2O 3 and SnO 2 with diameters of tens of nanometres and lengths of many micrometres have been grown using micellar nanohybrids consisting of methacrylate-based ...

    • Article  

      Third-order optical nonlinearities of PVP/Pd nanohybrids 

      Papagiannouli, I.; Potamianos, D.; Krasia-Christoforou, T.; Couris, S. (2017)
      Pd nanoparticles stabilized by polyvinylpyrrolidone were synthesized following mild reduction of palladium ion complexes. Their morphology and optical properties were characterized using Transmission Electron Microscopy, ...

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