Abstract
For the effective production of hydrocarbon liquid fuel in the hydrocracking of the Fischer-Tropsch (FT) product, the catalytic performance of Pt-loaded catalysts with low Pt content was investigated using an autoclave at 250 °C, an initial H2 pressure of 0.5 MPa, and a reaction time of 1 h. A screening study using Pt-loaded catalysts with a Pt content of 0.1 wt. % indicated that zeolite supports were more favorable for jet fuel (carbon numbers 9–15) production than amorphous oxide supports. The small particle size of the supported Pt particles and the high amount of medium acid sites for the supports led to higher performance of the Pt-loaded zeolite catalysts. In the hydrocracking reaction over Pt catalysts using the zeolite support with the high amount of medium acid sites, the yields of the corresponding jet fuel at 0.02 and 0.1 wt. % were almost the same. Pt-loaded catalysts with a Pt content of 0.02 wt. % were prepared using water-in-oil (w/o) microemulsions and their particle size was controlled between 1.0 and 2.6 nm. While the yield of the corresponding jet fuel was independent of Pt particle size, smaller Pt particles typically promoted the production of lighter hydrocarbons.
Highlights
In Japan, the annual demand for transportable liquid fuels is approximately 90 billion liters
This suggested that the smaller size of the Pt complex particles synthesized in the liquid phase promotes particle diffusion into the mesopore of the BEA28 support
With a Pt content of 0.2 wt. %, the size distribution of Pt particles obtained by the impregnation method was broader compared to that afforded by the deposition method using w/o microemulsions [27]
Summary
In Japan, the annual demand for transportable liquid fuels is approximately 90 billion liters. The authors previously reported the preparation of Pt-loaded catalysts using water-in-oil (w/o) microemulsions and the effect of Pt particle size on hydrocracking reaction [22,23]. This preparation method is advantageous as the size of the supported Pt particles is well controlled, regardless of the Pt content. Hydrocarbons with carbon numbers less than 8, 9–15 (i.e., corresponding jet fuel), and greater than 16 were focused on, and the effect of structure of Pt-loaded catalysts with low content on product yield was discussed
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have