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. 2020 Oct 6;5(41):26413-26420.
doi: 10.1021/acsomega.0c02711. eCollection 2020 Oct 20.

Hydrocracking of Fischer-Tropsch Paraffin Mixtures over Strong Acid Bifunctional Catalysts to Engine Fuels

Szabina Tomasek  1 , Ferenc Lonyi  2 , Jozsef Valyon  2 , Anett Wollmann  3 , Jenő Hancsók  1
Affiliations

Hydrocracking of Fischer-Tropsch Paraffin Mixtures over Strong Acid Bifunctional Catalysts to Engine Fuels

Szabina Tomasek et al. ACS Omega. .

Abstract

Biomass-based Fischer-Tropsch paraffin mixtures, having C16-C46 and C11-C45 carbon number range, were hydrocracked over platinum-supported beta, ZSM-5, and mordenite catalysts. The aim of the study was to investigate the effects of the feedstock composition, the process parameters, and the catalyst properties (acidity and zeolite structure) on the C21+ conversions, the product yields, and the isoparaffin contents. It was stated that lower C21+ conversions and higher JET and diesel fuel yields can be obtained for feedstock comprising C11-C45 hydrocarbons. Under identical reaction conditions, the activity order of the catalysts was Pt/H-beta > Pt/H-ZSM-5 > Pt/H-mordenite. This order corresponds to the relative number of accessible acid sites. Among the tested catalysts, platinum-supported beta zeolite showed the highest hydroisomerization activity; meanwhile, in the pores of Pt/ZSM-5 and Pt/H-mordenite, diffusion constraints were observed. As the product of hydrocracking valuable gasoline, JET and diesel fuels having high hydrogen content and excellent burning properties were produced.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
Fourier transform infrared spectra of H-beta, H-ZSM-5, and H-mordenite zeolites (A) in the ν(OH) region and (B) spectra of the adsorbed C5H5N on the same zeolites.
Figure 2
Figure 2
Integrated absorbance of the band at 1546 cm–1 as a function of the evacuation temperature (cf. the legend of Figure 1).
Figure 3
Figure 3
C21+ conversions in the function of the process parameters (P = 40 bar and H2/hydrocarbon volume ratio = 600).
See this image and copyright information in PMC

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