| AVS 54th International Symposium | |
| Surface Science | Tuesday Sessions |
| Session SS1-TuA |
| Session: | Bimetallics and Alloys |
| Presenter: | D.W. Goodman, Texas A&M University |
| Authors: | P. Han, Texas A&M University I. Lyubinetsky, Pacific Northwest National Laboratory D.W. Goodman, Texas A&M University |
| Correspondent: | Click to Email |
The distance between surface Pd atoms is known to control the catalytic formation of vinyl acetate from ethylene and acetic acid by AuPd catalysts. In this study, we use the thermodynamic properties and the surface lattice spacing of a AuPd(100) alloy single crystal model catalyst to control and optimize the number of Pd monomer-pair sites with a specific Pd-Pd distance. Scanning tunneling microscopy reveals that sample annealing has a direct effect on the surface Pd arrangements: short-range order preferentially forms Pd-pairs located at local c(2 x 2) sites, sites known to be active for vinyl acetate synthesis. This methodology should be useful in the optimization of bimetallic industrial catalysts.