| AVS 61st International Symposium & Exhibition | |
| Surface Science | Monday Sessions |
| Session SS+EN-MoA |
| Session: | Metals, Alloys and Oxides: Structure, Reactivity & Catalysis |
| Presenter: | Xin Tang, Johns Hopkins University |
| Authors: | X. Tang, Johns Hopkins University D. Bumueller, Universität Konstanz, Germany G. Gantefoer, Universität Konstanz, Germany D.H. Fairbrother, Johns Hopkins University K.H. Bowen, Johns Hopkins University |
| Correspondent: | Click to Email |
Metal oxide nanoparticles and clusters are widely used as redox and acid/ base catalysts in heterogeneous catalysis. The catalytic activity of the size selected metal oxide clusters (WO3)n and (MoO3)n (n = 1, 2, 3, 5, 30) were studied as a function of their size. The 2-propanol dehydration reaction was conducted on both two cluster catalysts. Temperature programmed reaction (TPR) was utilized to characterize the catalytic activity of the deposited cluster catalysts. The cluster size, supporting substrates, and the chemical compositions of the clusters were found to play an important role in determining the catalytic activity of the metal oxide clusters. For tungsten oxide clusters on the annealed oxide films, the catalytic activity of the clusters was found to be linear correlated to the size of the cluster. In addition, lower catalytic activity was observed for (WO3)1 monomer supported on the HOPG surface compared to the annealed oxide support. Meanwhile, molybdenum oxide clusters exhibited low catalytic activity toward 2-propanol dehydration reactions.