The production of renewable aviation fuel from waste cooking oil. Part II: Catalytic hydro-cracking/isomerization of hydro-processed alkanes into jet fuel range products

In this study, the surrogates of long chain paraffins produced from waste cooking oil through hydro-processing was hydro-cracked and hydro-isomerized for studying the process for producing renewable aviation fuel, through carrying out the experiments with varying reaction temperature, pressure, H2-t...

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Bibliographic Details
Published in:Renewable energy 2020-09, Vol.157, p.731-740
Main Authors: Chen, Yu-Kai, Hsieh, Chung-Hung, Wang, Wei-Cheng
Format: Article
Language:English
Subjects:
Bio-jet fuel
Hydro-isomerization
Hydro-processing
Hydrocracking
Paraffin
SAPO-11
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Summary:In this study, the surrogates of long chain paraffins produced from waste cooking oil through hydro-processing was hydro-cracked and hydro-isomerized for studying the process for producing renewable aviation fuel, through carrying out the experiments with varying reaction temperature, pressure, H2-to-alkane ratio and weight hourly space velocity (WHSV) over the home-made NiAg/SAPO(silicoaluminophosphate)-11catalyst. The data of conversion, selectivity, isomer yield and isomer-to-normal (I-to-N) alkane ratio were determined for evaluating the performance of the catalyst. The catalyst characterizations of the fresh and spent catalysts were examined through the technologies of Scanning Electron Microscopy (SEM), powder X-ray diffraction (XRD), thermo-gravimetric analysis (TGA) and fourier-transform infrared (FTIR) spectroscopy. It was found that the rearrangement of vapor-liquid equilibrium and increase in residence time by adjusting the operating conditions improved the performance of hydro-cracking/isomerization. In addition, based on the results of catalyst characterizations, the unreacted feed was dispersed onto the surface of the catalyst, expected to deactivate the catalyst. •Surrogate of hydro-processed alkanes was converted by max. 71% over NiAg/SAPO-11.•The selectivity of jet fuel, I-to-N alkane ratio reached 88% and 1.5 respectively.•Catalyst activity would be reduced due to the blockage of pore by unreacted feed.
ISSN:0960-1481
1879-0682
DOI:10.1016/j.renene.2020.04.154