Author/Authors :
Saint-Lager، نويسنده , , M.C. and Jugnet، نويسنده , , Y. and Dolle، نويسنده , , P. and Piccolo، نويسنده , , L. and Baudoing-Savois، نويسنده , , R. and Bertolini، نويسنده , , J.C. and Bailly، نويسنده , , A. and Robach، نويسنده , , O. and Walker، نويسنده , , C. and Ferrer، نويسنده , , S.، نويسنده ,
Abstract :
The (N × 1) reconstruction (N = 5–6) of the clean Pd8Ni92(1 1 0) surface has been investigated by surface X-ray diffraction. A good fit with experimental data collected under UHV conditions is obtained when introducing undulations in the outer dense rows, constituted mainly of Pd atoms which strongly segregate to the surface. This reconstruction can be regarded as a way to relax the strains induced on the bigger Pd surface atoms, at least partially. The modifications of the surface were studied under butadiene then hydrogen as well as during butadiene hydrogenation at elevated pressure at 300 K and the (N × 1) reconstruction was found to be still present. The main changes are observed under pure hydrogen and during butadiene hydrogenation.
Keywords :
Single crystal surfaces , PdNi alloy , Butadiene hydrogenation , In situ X-ray diffraction
