Heterocycle chemistry on Pd(111): Thiophene and furan decomposition studied by LITD/FTMS
- Univ. of California, Riverside, CA (United States)
The chemistry of sulfur- and oxygen-containing compounds on transition metal surfaces is of great interest due to the necessity of their removal from petroleum and biomass hydrocarbon resources. Compounds such as thiophene and furan have become models for understanding the interactions between these heterocompounds and catalyst surfaces. In particular, late transition metals have been shown to be useful promoters in hydrotreating catalysis, however very few UHV studies of heterocompounds on late transition metals have been performed. Recent results from this group using TDS and laser-induced thermal desorption with FT mass spectrometry indicate the low-temperature decomposition mechanism of these two compounds on clean Pd(111) differs significantly despite the similarity in their structures. Thiophene decomposition involves cleavage between the C-S bonds, resulting in the deposition of surface sulfur and the formation of a tightly bound C{sub 4} species on the surface which undergoes hydrogenation to form a significant amount of 1,3-butadiene. Furan, on the other hand, decomposes via elimination of {alpha}-H (desorbing as H{sub 2}) and CO{sub 3} leaving a C{sub 3}H{sub 3} species on the surface. Heating to 320K causes dimerization of some of the C{sub 3} species, forming a small amount of benzene. Deuterium labeling studies will be presented to further elucidate the mechanisms.
- OSTI ID:
- 370175
- Report Number(s):
- CONF-960376-; TRN: 96:003805-0226
- Resource Relation:
- Conference: Spring national meeting of the American Chemical Society (ACS), New Orleans, LA (United States), 24-28 Mar 1996; Other Information: PBD: 1996; Related Information: Is Part Of 211th ACS national meeting; PB: 2284 p.
- Country of Publication:
- United States
- Language:
- English
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