A method for the quantification of the chain length of surface hydrocarbon species on Fischer-Tropsch catalysts by in-situ FTIR was combined with online gas chromatography in order to investigate any potential relationship between adsorbed hydrocarbons species and those detected as reaction products. By varying the reaction conditions and the active metal, changes to the chain lengths of surface species and the product distribution were monitored. Results show that the species observed spectroscopically are predominantly adsorbed reaction products which do not directly relate to the detected reaction products. Hydrocarbon species which can be transported to the support material (γ-alumina) may be ascribed to oxygenated products which are not produced in detectable amounts by GC at low conversion but are selectively adsorbed from the gas phase.

原位定量费-托催化剂上表面烃类链长的方法FTIR与在线气相色谱仪结合使用，以研究吸附的烃类与作为反应产物检测到的烃之间的任何潜在关系。通过改变反应条件和活性金属，可以监测表面物质链长的变化和产物的分布。结果表明，在光谱上观察到的物质主要是吸附的反应产物，与检测到的反应产物没有直接关系。可以输送到载体材料（γ-氧化铝）的烃类可能归因于氧化产物，这些产物不能通过GC在低转化率下以可检测的量产生，而是从气相中选择性吸附。