Effect of pressure on H/D exchange during n-octane conversion with Pt-SiO2 catalysts

Wang, Yuguo; Davis, Burtron H.

doi:10.1016/j.apcata.2005.04.012

Cited by 2 publications

(2 citation statements)

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“…Gas chromatography (GC) is employed in numerous concentrations across several branches of science . For catalyst probing experimentation, chromatography is currently utilized to separate closely related molecules such as isotopically labeled compounds . Many studies that utilize these isotopic materials during a catalytic experiment are attempting to determine the mechanism, and/or the rate‐limited step of a particular catalytic experiment .…”

Section: Introductionmentioning

confidence: 99%

“…1 For catalyst probing experimentation, chromatography is currently utilized to separate closely related molecules such as isotopically labeled compounds. [2][3][4][5][6][7][8] Many studies that utilize these isotopic materials during a catalytic experiment are attempting to determine the mechanism, and/or the rate-limited step of a particular catalytic experiment. [9][10][11][12][13][14][15][16] Specifically, the Fischer-Tropsch (FT) process is a synthesis by which 2 simple diatomic molecules H 2 and CO are utilized to produce a vast series of hydrocarbon materials ranging from C 1 to C 70 .…”

Section: Introductionmentioning

confidence: 99%

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Exchange interference for a range of partially deuterated hydrocarbons using a GC‐EI‐MSD

Shafer

Davis

2018

J Mass Spectrom

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Industrial catalyst processes, such as the Fischer-Tropsch process produce a vast array of products from syngas (H /CO) such as; jet fuel, gasoline, diesel, synthetic rubbers, monomers for plastics industries and other oil/wax materials for specific purposes such as cosmetics. Multitudes of publications, since the discovery of the FT process in 1925, have been composed attempting to elucidate the mechanism. Many of these publications attempt to investigation the mechanism of FT by the utilization of specific deuterium experimentation through the switching of the syngas from H /CO to D /CO. Results from this switching indicated that hydrogen was involved in the rate limited step, however; the overall process conversion produced an inverse kinetic isotope effect (IKIE). To confirm results were not hindered by the physical switch of the hydrogen isotopes, further experimentation was performed using equal molar of each isotope competitively (i.e. equal molar H /D )/CO. Complications arose from this competitive work as it generated fully exchanged products - all partially deuterated hydrocarbons that could not be separated by chromatography. Thus, these compounds could no longer be separated by the chromatography and now required a further separation by mass. The overall scope for this work was to determine if a range of partially deuterated paraffin compounds, generated by FT, can be analyzed using an EI-MSD without inter-instrumental H/D exchange. Results indicate that no real exchange occurs in the EI MSD for a carbon range from about C - C . Thus, even though the materials cannot be separated chromatographically they can be further separated and analyzed to determine the overall H/D content for these specific chain lengths.

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Section: Introductionmentioning

confidence: 99%