Use of n-hexadecane-1,2-{sup 13}C to understand the cracking mechanism and kinetics of normal alkanes in crude oils
Conference
·
OSTI ID:126542
- Lawrence Livremore National Lab., CA (United States)
Adjacent {sup 13}C atoms are rare in natural abundance, so their use as isotopic tracers provides a sensitive and selective method to follow reaction pathways of specific molecules in complex reaction matrices. N-hexadecane-1,2-{sup 13}C added to neat hexedecane and three distinctly different crude oils has enabled us to outline similarities and differences in the high-pressure alkane cracking reactions in these different matrices, with and without added water. Reaction progress was monitored by GC-MS (P+2) and {sup 13}C NMR ({open_quotes}INADEQUATE{close_quotes} pulse sequence). The overall cracking rate is 60% slower in real oils, apparently because more labile sources in the crude oil preferentially donate hydrogen to the alkyl radicals. The oil matrices also inhibit the formation of larger branched alkanes by alkyl addition of alkenes.
- OSTI ID:
- 126542
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
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