Hydrogen atoms at the palladium surface, at the MgO surface and at the Pd-MgO metal-support boundary. Towards computer modelling of the spillover effect

• Autorzy: Bartczak, W.M. , Stawowska, J.
• Konferencja: International Seminar Nanomaterials-Simulations and Experiments , Łódź, 15-16 April 2005
• Języki publikacji: EN

Abstrakty

EN

The work is devoted to computer modelling of interactions of atomic hydrogen with palladium and MgO surfaces, and with Pd atoms adsorbed on MgO surface. Quantum calculations were performed using the methods of the Density Functional Theory (DFT) with gradient-corrected functionals for electron exchange and correlation. The potential energy surfaces were calculated for a hydrogen atom interacting with Pd and MgO surfaces. The results indicate an easy (0.17 eV activation barrier) diffusion of hydrogen atoms over the metal surface. A possibility of migration of H atoms from the metal surface onto the MgO support surface (the "spillover effect") is discussed. It was found that the transfer of a hydrogen atom from the vicinity of a Pd atom to O sites of the MgO surface results in the energy gain of the order of 0.5 eV. The transfer, however, is an activated process with the activation energy about 0.8 eV.

Słowa kluczowe

PL

MgO; wodór; pallad; tlenek magnezu; dyfuzja powierzchniowa; kataliza

EN

hydrogen; palladium; MgO; surface diffusion; catalysis; spillover

• Czasopismo: Materials Science Poland
• Rocznik: 2006
• Tom: Vol. 24, No. 2/1
• Strony: 421--432
• Opis fizyczny: Bibliogr. 25 poz.

Twórcy

autor

Bartczak, W.M.

autor

Stawowska, J.

• Institute of Applied Radiation Chemistry, Technical University of Łódź, ul. Wróblewskiego 15, 93-590 Łódź,

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