Perhydrofluorene

• CAS: 5744-03-6
• Catalog Number: ACM5744036
• Category: Alkanes
• Molecular Weight: 178.31
• Molecular Formula: C₁₁H₁₆O₂
• Hazard Statements: H304
• RIDADR: UN3082 - class 9 - PG 3 - DOT NA1993 - Environmentally hazardous substances, liquid, n.o.s. HI: all (not BR)
• Symbol: GHS08

Case Study

Effects of Perhydrofluorene on the Thermophysical Properties of Liquid Organic Hydrogen Carrier Systems

Kerscher, Manuel, et al. International Journal of Hydrogen Energy, 2023, 48(76), 29651-29662.

Fluorene (H0-F) and perhydrofluorene (H12-F) are byproducts arising from the dehydrogenation of ring structures in liquid organic hydrogen carrier (LOHC) systems that utilize diphenylmethane (H0-DPM) and dicyclohexylmethane (H12-DPM). This study investigated the impact of these byproducts on the liquid viscosity, surface tension, and density of DPM-based systems through an experimental analysis of a dehydrogenated binary mixture of H0-F and a hydrogenated binary mixture of H12-F (at a 0.10 mol fraction) under conditions near 0.1 MPa and temperatures ranging from 283 to 573 K.
Key Findings
The density rises by approximately 1% with each added mole fraction of H0-F or H12-F.
Surface tension increases by as much as 6% compared to the values for H0-DPM or H12-DPM.
Additionally, the incorporation of H0-F into H0-DPM or H12-F into H12-DPM results in a relative viscosity increase of up to 9% at the lowest temperature examined.

Relationship Between Molecular Structure and Pyrolysis Performance of High Energy Density Fuels Such as Perhydrofluorene

Liu, Qing, et al. Fuel, 2024, 358, 130342.

High energy density endothermic hydrocarbon fuel (HDEHF) serves as the ideal onboard coolant solution for managing the thermal systems of advanced aircraft. In order to explore the relationship between different molecular structures and pyrolysis performance of high energy density (HED) fuels, five HED fuels with different ring structures, namely, bicyclohexyl (BCH), perhydrofluorene (PHF), decahydronaphthalene (DHN), exo-tetrahydrodicyclopentadiene (exo-THD) and cyclopropyltetrahydrodicyclopentadiene (CTHD), were employed as research models in this work.
Key Findings
· The pyrolysis conversion of the fuels tested (at 650 °C and 4 MPa) ranks as follows: CTHD > PHF > BCH > DHN > exo-THD. This ranking is closely linked to their C and H atom counts, denoted as n_H+C, with the exception of CTHD, which has a high-tension ring.
· Through product distribution analysis and DFT calculations, proposed decomposition reaction pathways for the fuels were established. The order of heat sink performance for the fuels is BCH > PHF > DHN > exo-THD > CTHD, which corresponds closely with the equation n_H/C^6.9 × n_H+C^3.8. The fitting results established a link between molecular structures and the physicochemical properties of fuels.