The dynamic catalytic surface: probing bimetallic active sites with medium energy ion scattering

Pd/Cu alloys as hydrodechlorination catalysts: a medium-energy ion scattering study of surface composition under exposure to chlorinated hydrocarbons

“…In other data (not shown here), annealing to 923 K was seen to have the opposite effect of slight Cu enrichment in the first layer. 9 These results are in good agreement with the previous data for the Pd 50 Cu 50 (110) surface, which has been investigated extensively by Loboda-Cackovic using low-energy electron diffraction (LEED) and AES. 10 He also found that the surface could be enriched in either component, depending on the sample preparation procedure.…”

“…The magnitude of the induced segregation appears to be, if anything, greater for C(ads) than for Cl(ads), because Cl(ads) is expected to be the majority species after high-temperature annealing and the surface has returned to virtually bulk-like composition. In other work, 1,2-trans-dichloroethene has been shown to give much higher levels of Cu segregation 9 and if the surface chemistry resembles that of Cu(110) this may be explained by the fact that the majority of hydrocarbon species are eliminated from the surface in the form of benzene. 15 This work has demonstrated clearly the ability of the PdCu alloy surface to respond dynamically to the adsorption of chlorohydrocarbons.…”

“…In other work, room-temperature adsorption of ethene has been seen to give a smaller but still significant Pd enhancement in the alloy surface. 9 In the case of trichloroethene-dosed surfaces it is expected that, in addition to Cl adsorption, considerable hydrocarbon species and/or residual carbon will also be present. A schematic representation of trichloroethene adsorption on PdCu(110) is shown in Fig.…”

O2 dissociation in Na-modified gold ultrathin layer on Cu(111)

“…In recent years chemical reactions at bimetallic surfaces are attracting a great attention [1][2][3][4][5][6][7][8][9][10][11][12][13] for both fundamental interest and technological applications. Metal/metal interfaces show novel physical and chemical properties [4,9,[14][15][16].…”

“…Metal/metal interfaces show novel physical and chemical properties [4,9,[14][15][16]. In particular, bimetallic surfaces involving gold [7,[17][18][19] are extensively investigated due to the high catalytic activity of nanostructured gold systems [20][21][22][23].…”