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A Monte-carlo (MC) simulation procedure has been developed where the pairbond energies are allowed to take into account the various coordination numbersof surface atoms and the presence of adsorbates. The pair bond energies arecalculated from partial bond energies of atoms which, in turn, are calculatedfrom modified tight binding model in the second moment approximation. The modelhas been applied to study the role of adsorption of hydrogen, oxygen, carbonmonoxide and nitric oxide on the surface composition and surface bond geometryof bimetallic Pd-X (X = Ag, Cu, Ni, Pt) nanoparticles having fcccubo-octahedral geometry with 201, 586, 1289 and 2406 atoms. The results arecompared with the known experimental results. Importance of the results instudying reactions on supported bimetallic catalysts has been highlighted.Comment: 15 pages (Latex) + 38 figures (eps

SPATIAL DISTRIBUTION OF ATOMS IN GAS-COVERED Pd-X NANOPARTICLES (X=Ag, Cu, Ni, Pt)