| AVS 62nd International Symposium & Exhibition | |
| Surface Science | Tuesday Sessions |
| Session SS+AS+EN-TuM |
| Session: | Mechanistic Insight of Surface Reactions: Catalysis, ALD, etc. - I |
| Presenter: | Mingshu Chen, Xiamen University, China |
| Authors: | J. Hu, Xiamen University, China J.J. Huang, Xiamen University, China H. Zhang, Xiamen University, China M.S. Chen, Xiamen University, China |
| Correspondent: | Click to Email |
The Cu/Al2O3/ZnO(0001)-Zn ternary model catalysts were prepared and characterized by XPS and LEISS. The Al2O3/ZnO was prepared by depositing Al onto the ZnO surface in O2 atmosphere at 523 K, and Cu/ZnO was prepared by depositing Cu onto ZnO surface at room temperature. It was found that Al2O3 grew on the ZnO surface by a layer-by-layer model, while Cu formed two-dimensional islands only at low coverage and three dimensional clusters at high coverage. For Cu/Al2O3/ZnO(0001)-Zn, the XPS and LEIS spectra showed that the copper islands were preferred on the interfaces of Al2O3/ZnO. Comparing to the Cu/ZnO binary model catalyst, the addition of Al2O3 obviously slowed down the reduction of Cu/Al2O3/ZnO by H2. More significantly, the existence of Al2O3 in the ternary model catalyst leaded to an increase of Cu+ concentration. The enhancement of Al2O3 in Cu/Al2O3/ZnO(0001)-Zn for methanol synthesis may origin from that the Al2O3 helps to stabilize the surface Cu+ which has been proposed as one of the active sites.