Abstract
Accurate analysis of Fischer–Tropsch (FT) products is very important for reaction mechanism and kinetics studies. However, it is rather complex since many factors in collecting, measurement and GC analysis have influences on the results. These factors should be considered in research to avoid possible artifacts. In this paper, some issues and considerations in FT products analysis were discussed. To obtain reliable results, it is recommended to collect samples after the steady state of the reaction reached without further catalyst reconstruction and net products accumulation. Products collection fraction should be in acceptable range besides commonly calculated balances. The physical separation of different phases of products should be as complete as possible and the identification of different products in GC analysis should be checked carefully.
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14 July 2018
The authors regret that a certain error in their manuscript was not find in time during manuscipt proof, which might puzzle readers. The corrected section now appear here.
Notes
Oxygenates in encapsulated aqueous would change the weight percentage of wax \({x}_{w}^{i}\) to \({x}_{w}^{{\prime}i}\), and the weight of a product become to:\({w^{\prime} }_{ole}^i = x_{ole,g}^i{W_g} + x_{ole,o}^i{W_o} + x_{ole,w}^{\prime i}({W_w} + \Delta W)\).\(= w_{ole}^i + [\left( {x_{ole,w}^{\prime i} - x_{ole,w}^i} \right){W_w} + x_{ole,w}^{\prime i}\Delta W]\).\({w^{\prime _{para}^i}} = x_{para,g}^i{W_g} + x_{para,o}^i{W_o} + x_{para,w}^{\prime i}\left( {{W_w} + \Delta W} \right) = w_{para}^i + [\left( {x_{para,w}^i - x_{para,w}^i} \right){W_w} + x_{para,w}^{\prime i}\Delta W]\).\({w^{\prime} }_{oxy}^i = x_{oxy,a}^i({W_a} - \Delta W) + x_{oxy,o}^i{W_o} + x_{oxy,w}^{\prime i}({W_w} + \Delta W) = w_{oxy}^i + [(x_{oxy,w}^{\prime i} - x_{oxy,w}^i){W_w} + (x_{oxy,w}^{\prime i} - x_{oxy,a}^i)\Delta W]\).However, the amount of oxygenates in encapsulated aqueous is minor compared to wax, and in most cases little difference between \({x}_{w}^{i}\) and \({x}_{w}^{{{\prime}}i}\) can be observed, and using \({x}_{w}^{i}\) instead of \({x}_{w}^{{{\prime}}i}\) as the weight percentage when encapsulated aqueous can only induce negligible error in weight calculation. Here, to simplify the discussion, we use \({x}_{w}^{i}\) as the weight percentage in the following discussion.
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Acknowledgements
This work is financially supported by State Key Fundamental Research Program (Ministry of Science and Technology of China, No. 2011CBA00501), Shanghai Municipal Science, Technology Commission, China (Grant Nos. 11DZ1200300 and 11ZR1436200) and NUPTSF (Grant Nos. NY215016 and NY215079).
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Xiao, K., Qi, X., Wang, X. et al. Factors Associated with Accurate Analysis of Fischer–Tropsch Products. Catal Lett 147, 704–715 (2017). https://doi.org/10.1007/s10562-016-1958-4
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DOI: https://doi.org/10.1007/s10562-016-1958-4