Abstract
Pt-loaded β-type zeolite catalysts with constant Pt content (0.11 wt.%) and similar pore structure were prepared using a water-in-oil (w/o) microemulsion. The effect of Pt particle synthesis conditions using microemulsion (a type of Pt complex-forming agents and the molar ratio of complex-forming agent to Pt4+) on loaded Pt particle size was investigated. The Pt particle size of the Pt catalyst using tetraethylammonium chloride (TEAC) as a complex-forming agent with the molar TEAC/Pt ratio 10 was the minimum value (3.8 nm), and was much smaller than that (6.7 nm) prepared by the impregnation method. The utilization of the complex-forming agent of which hydrophobic groups occupied a small volume and the appropriate complex-forming agent/Pt ratio were favorable for synthesis of small Pt particles. The effect of loaded Pt particle size on the hydrocracking of the Fischer-Tropsch (FT) product was investigated using the Pt-loaded zeolite catalysts at 250 °C with an initial H2 pressure of 0.5 MPa, and reaction time of 1 h. The Pt catalyst with a Pt particle size of 4.2 nm prepared using the microemulsion exhibited the maximum corresponding jet fuel yield (30.0%), which was higher than that of the impregnated catalyst.
Highlights
The current annual demand for transportation liquid fuels in Japan is approximately 90 billion liters.Airline companies account for approximately eight billion liters
Pt-loaded zeolite catalysts were prepared by immobilizing Pt particles synthesized in the liquid phase onto zeolite supports
Pt-loaded β-type zeolite catalysts were prepared by synthesizing Pt particles using a w/o microemulsion and immobilizing the particles onto zeolite supports
Summary
The current annual demand for transportation liquid fuels in Japan is approximately 90 billion liters. From the point of view, the authors have accomplished a liquid hydrocarbon production rate of 16 liters per day by operating a bench-scale BTL plant which utilized woody biomass gasification with oxygen-enriched air/CO2 and the FT synthesis over a highly effective FT catalyst [7]. By immobilizing the particles on the support materials, it is possible to prepare metal-loaded catalysts regardless of the metal content and pore structure [24,25,26,27,28]. Pt-loaded β-type zeolite catalysts with a constant, low Pt content and similar pore structure are prepared using w/o microemulsions. The effect of the Pt particle size on the jet fuel yield is investigated in hydrocracking of the FT product derived from biomass
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