Deuterium Tracer Studies and Gas Chromatography-Mass Spectrometry Analysis of Deuterated Products during Fischer-Tropsch Synthesis

作者：Shi Buchang^*; Liao Yunxin; Wu Lin; Davis Burtron H

来源：Topics in Catalysis, 2014, 57(6-9): 460-469.

DOI：10.1007/s11244-013-0202-3

• Fischer-Tropsch synthesis
• Deuterium probes
• GC-MS analysis
• Inverse isotope effect
• ASF kinetics
• Deuterium enrichment

Hydrogen is one of the two reagents of Fischer-Tropsch (FT) synthesis. In order to have the information about the role of hydrogen, which is the key to understand the mechanism of the reaction, deuterium tracer experiments are useful. One of the obstacles in conducting deuterium tracer experiments during FT reactions is to accurately determine the amounts of isotopomers of a hydrocarbon in the FT products. Because of an inverse isotope effect for isotopomers on a GC column, the isotopomer with more deuterium atoms will be eluted first. If the difference in deuterium atoms is > 3, the quantitative analysis of a mixture of isotopomers can be conducted using GC-FID. However, if the difference in deuterium atoms is < 3, an accurate measurement of the relative amounts of isotopomers of a compound requires a determination of the total area of all of the molecular ions by gas chromatography-mass spectrometry (GC-MS). The results determined using this method are close to the true value (by weight) with an error of +/- 3 %. The deuterium tracer technique and GC-MS analysis of FT products have been used to study the accumulation effects, the role of H2O, the isotope effect, the role of C-2 species derived from ethanol and ethene, and deuterium enrichment during FT reactions.

• 出版日期2014-4