Pt-group metals were some of the first metals to be studied as catalysts
for industrial use. The goal of these studies was to ascertain a fundamental
understanding of CO oxidation and acetylene cyclotrimerization reactions on Ptgroup
metals. A further goal was to determine the optimal conditions for each
reaction.
CO oxidation on Rh(111),Pt(100), and Pd(100) was scrutinized on various
oxide surfaces from chemisorbed to bulk metal oxides. Low pressure reactions
on Rh(111) reveal the highest activity was a CO uninhibited surface with <1ML of
chemisorbed oxygen. Pt(100) high pressure oxidation revealed that only <1ML
oxygen is formed during high pressures reactions. High pressure CO oxidation
reactions on Pd(100) show oxygen penetration after CO has been consumed;
however, during the highest activity XPS found only chemisorbed species.
The cyclotrimerization of acetylene to benzene is another reaction found
in industry typically carried out on Pd. The active site is considered to be a 7 atom configuration with 6 atoms surrounding a central atom. By adding
relatively catalytically inert Au atoms to the active Pd(111) surface the acetylene
coupling activity is enhanced. Cyclization activity is a function of the surface
composition and the surface structure. A single Pd atom surrounded by six Au
atoms is found to have the highest activity at 300K for acetylene
cyclotrimerization.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-2008-12-211 |
| Date | 14 January 2010 |
| Creators | Gath, Kerrie K. |
| Contributors | Goodman, D. Wayne |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Dissertation |
| Format | application/pdf |
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