Browsing by Subject "Isotopes"

Article

Dry reforming of methane over 5 wt% Ni/Ce1-xPrxO2-δ catalysts: Performance and characterisation of active and inactive carbon by transient isotopic techniques

Vasiliades, Michalis A.; Makri, M. M.; Djinović, P.; Erjavec, B.; Pintar, A.; Efstathiou, Angelos M. (2016)

The effects of Ce1-xPrxO2-δ support composition (x = 0.0–0.8) and reaction temperature (550–750 °C) on the catalytic activity and selectivity and important features of the mechanism of the dry reforming of methane (DRM) ...

Article

Effect of support composition on the origin and reactivity of carbon formed during dry reforming of methane over 5 wt% Ni/Ce1-xMxO2-δ (M = Zr4+, Pr3+) catalysts

Makri, M. M.; Vasiliades, Michalis A.; Petallidou, Klito C.; Efstathiou, Angelos M. (2016)

Carbon dioxide reforming of methane to synthesis gas in the 550-750°C range over 5 wt% Ni/Ce1-xMxO2-δ (M = Zr4+, Pr3+) solids has been investigated with respect to the effects of support chemical composition and reaction ...

Article

Effect of thermal aging on the transient kinetics of oxygen storage and release of commercial Cex Zr1-x O2-based solids

Christou, Stavroula Y.; Bradshaw, H.; Butler, C.; Darab, J.; Efstathiou, Angelos M. (2009)

The use of powerful analytical methodologies for the evaluation of the performance of commercial oxygen storage materials based on oxygen transient isothermal isotopic exchange experiments is illustrated in this study. Ce ...

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

Effects of reaction temperature and support composition on the mechanism of water - Gas shift reaction over supported-Pt catalysts

Kalamaras, Christos M.; Gonzalez, I. D.; Navarro, R. M.; Fierro, José Luis García; Efstathiou, Angelos M. (2011)

The present work reports on a detailed study of the effect of support chemical composition and reaction temperature on the mechanism of the water-gas shift (WGS) reaction over supported-Pt catalysts. The effect of the same ...

Article

Hula-twist photoisomerization of a styrene derivative examined by argon-matrix-infrared-spectroscopic method

Nakane, N.; Nicolaïdes, Andrew N.; Tomioka, H.; Asato, A. E.; Liu, R. S. H. (2006)

IR spectra of α-cyano- o -fluorocinnamonitrile, its vinyl deuterated analogue and the corresponding photoproducts were recorded under Ar matrix isolation conditions (13K). An analysis of the IR spectra, assisted by ...

Article

The influence of reaction temperature on the chemical structure and surface concentration of active NOx in H2-SCR over Pt/MgO{single bond}CeO2: SSITKA-DRIFTS and transient mass spectrometry studies

Savva, Petros G.; Efstathiou, Angelos M. (2008)

Steady-state isotopic transient kinetic analysis (SSITKA), transient isothermal, and temperature-programmed surface reaction in H2 (H2-TPSR) techniques coupled with online mass spectroscopy (MS) and in situ diffuse reflectance ...

Article

Low-temperature water-gas shift on Pt/Ce1-xLaxO2-δ: Effect of Ce/La ratio

Petallidou, Klito C.; Efstathiou, Angelos M. (2013)

Pt nanoparticles (1.0-1.4nm size) supported on Ce1-xLaxO2-δ (x=0.0, 0.2, 05, 0.8 and 1.0) carriers, the latter prepared by the citrate sol-gel method, were tested toward the water-gas shift (WGS) reaction in the 200-400°C ...

Article

Mechanistic studies of the water-gas shift reaction over Pt/Ce xZr1-xO2 catalysts: The effect of Pt particle size and Zr Dopant

Kalamaras, Christos M.; Dionysiou, Dionysios Demetriou D.; Efstathiou, Angelos M. (2012)

A series of y wt % Pt/CexZr1-xO2 catalysts (y = 0.1, 0.5, and 1.0

Article

Origin and reactivity of active and inactive carbon formed during DRM over Ni/Ce0.38Zr0.62O2-δ studied by transient isotopic techniques

Vasiliades, Michalis A.; Djinović, P.; Davlyatova, L. F.; Pintar, A.; Efstathiou, Angelos M. (2016)

The role of Ce0.38Zr0.62O2-δ redox support and that of reactants CH4 and CO2 in the carbon-path of dry reforming of methane (DRM) at 750°C over a 3wt% Ni/Ce0.38Zr0.62O2-δ catalyst were investigated. In particular, meticulously ...

Article

"Redox" vs "associative formate with -OH group regeneration" WGS reaction mechanism on Pt/CeO2: Effect of platinum particle size

Kalamaras, Christos M.; Americanou, Sofia; Efstathiou, Angelos M. (2011)

A series of x wt.% Pt/CeO2 catalysts (x = 0.1-2.0) was prepared to investigate for the first time the effect of Pt particle size on important kinetic and mechanistic aspects of the water-gas shift (WGS) reaction, namely ...

Article

The role of oxygen and hydroxyl support species on the mechanism of H 2 production in the steam reforming of phenol over metal oxide-supported-Rh and -Fe catalysts

Polychronopoulou, Kyriaki; Costa, Costas N.; Efstathiou, Angelos M. (2006)

The aim of this work was to probe for the first time the back-spillover of labile O and OH species during steam reforming of phenol towards H2 production over Rh and Fe supported on MgO, Mg-Ce-O and Mg-Ce-Zr-O metal oxides. ...

Doctoral Thesis Open Access

Ανάπτυξη νέων καταλυτικών συστημάτων βασισμένων στο CeO2 για την αντίδραση WGS

Πεταλλίδου, Κλειτώ Χ. (Πανεπιστήμιο Κύπρου, Σχολή Θετικών και Εφαρμοσμένων Επιστημών / University of Cyprus, Faculty of Pure and Applied Sciences, 2014-06)

H αντίδραση Water-Gas Shift (WGS, CO+H2OCO2+H2, ΔHo= -41 KJ/mol) αποτελεί σημαντικό μέρος του δικτύου των αντιδράσεων βιομηχανικής παραγωγής H2 μέσω αναμόρφωσης υδρογονανθράκων. Το αέριο προϊόν, πλούσιο σε Η2 είναι δυνατό ...