Unsteady-state direct partial oxidation of methane to synthesis gas in a fixed-bed reactor using AFeO3 (A = La, Nd, Eu) perovskite-type oxides as oxygen storage

Article Abstract:

An investigation on a direct partial oxidation of methane to synthesize gas on AFeO3 (A= La, Nd, Eu) oxides by a novel sequential redox cyclic reaction in the absence of gaseous oxygen is conducted over a fixed-bed reactor. The pulse experiments at different temperatures reveal that the rate of oxygen migration during the CH4 reaction with LaFeO3 is strongly affected by the reaction temperature, and increases with rising temperature, which is favorable to much more CH4 selective oxidation at high temperature.

Methane, Oxidation-reduction reaction, Oxidation-reduction reactions, Chemical properties

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On the definition of a Monte Carlo model for binary crystal growth

Article Abstract:

The lattice Monte Carlo (MC) model for binary crystal growth is considered to induce a freedom of choice in the transition probabilities, as the thermodynamic properties of the system does not ensure an agreement between MC simulations and the thermodynamic constraints. The analysis confirms that the kinetics have an extremely strong effect on the segregation of such models and hence also enables a straightforward determination of the optimal set of transition probabilities.

Usage, Thermodynamics, Monte Carlo method, Monte Carlo methods

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Low-temperature magnetic behavior of perovskite compounds PbFe(sub 1/2)Ta(sub 1/2)O(sub 3) and PbFe(sub 1/2)Nb(sub 1/2)O(sub 3)

Article Abstract:

The magnetic behavior of the two compounds PbFe(sub 1/2)Ta(sub 1/2)O(sub 3) and PbFe(sub 1/2)Nb(sub 1/2)O(sub 3) at low temperature is extensively studied and explained as the occurring of a spin-glasslike transition. The results shows that the magnetic anomaly at 9 K, observed can be ascribed to a spin-glass like transition.

Thermal properties, Magnetic properties, Spin glasses

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