Kinetics of the Autoxidation of a Jet-A Fuel

Pickard, James M.; Jones, E. G.

doi:10.1021/ef9600319

Cited by 16 publications

(19 citation statements)

References 19 publications

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“…This activation energy is lower than the values previously reported of hydrocarbon fuel autoxidations (ca. 150 kJ mol À1 [28] ), indicating that OH groups in diols increase rate constants for initiation and propagation steps. HomogeneScheme 3.…”

Section: Homogeneous 13-propanediol Oxidationmentioning

confidence: 99%

Homogeneous Oxidation Reactions of Propanediols at Low Temperatures

2010

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O2 reacts with propanediols via homogeneous pathways at 400–500 K. 1,2‐Propanediol forms CH3CHO, HCHO, and CO2 via oxidative CC cleavage and acetone via dehydration routes, while symmetrical 1,3‐propanediol undergoes dehydration and oxidative dehydrogenation to form, almost exclusively, acrolein (ca. 90 % selectivity). The products formed and their kinetic dependence on reactant concentrations are consistent with radical‐mediated pathways initiated by O2 insertion into CH bonds in a β position relative to oxygen atoms in diol reactants. Propagation involves β‐scission reactions that form hydroxyl and hydroxyalkyl radicals. Acrolein/O2/H2O mixtures from the homogeneous oxidation of 1,3‐propanediol form acrylic acid (with 90 % yield) in tandem reactors containing molybdenum‐vanadium oxide catalysts. These data reveal the unique reactivity of diols, compared with triols and alkanols, in homogeneous oxidations, while also providing useful insight into the molecular basis for reactivity in biomass‐derived oxygenates.

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Section: Homogeneous 13-propanediol Oxidationmentioning

confidence: 99%

Homogeneous Oxidation Reactions of Propanediols at Low Temperatures

2010

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“…In addition, which methyl groups are oxidized is unknown. Such a rate law would be observed if the TMP autoxidation were a standard peroxyl radical chain mechanism with the initiation provided by solvent autoxidation as shown below (Pickard and Jones, 1996).…”

Section: On the Mechanism Of Tm!' Autoxidationmentioning

confidence: 92%

On the Development of Oxygen Scavenger Additives for Future Jet Fuels

Beaver

Sharief

Teng

et al. 1999

Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations

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The need for the development of jet fuels that are oxidatively and thermally stable to 480°C (900°F) has been previously detailed (Edwards and Liberio, 1996). Such a fuel is commonly referred to as JP-900. It is our belief that a new class of additives can be developed which, when added to JP-8, will provide both the oxidative and thermal stability requirements of JP-900. Our most recent data is presented which explores the potential of 1,2,5-trimethylpyrrole (TMP) as a potential oxygen scavenger.

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“…Assuming one gram of zeolite is installed in our system, the fuel flow rate of 10.6 g/hr corresponds to a time on stream of approximately 330 s, and the fuel flow rate of 2.3 g/hr corresponds to a time on stream of approximately 1570 s. These time on stream values are similar to other documented experiments. [12][13][14][15] The zeolite catalyst was observed to coke significantly during a single test so that fresh catalyst was installed before each test.…”

Section: Experimental Procedures and Data Reduction Methodsmentioning

confidence: 99%

Experiments Studying Thermal Cracking, Catalytic Cracking, and Pre-Mixed Partial Oxidation of JP-10

Cooper

Shepherd

2003

39th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit

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Practical air-breathing pulse detonation engines (PDE) will be based on storable liquid hydrocarbon fuels such as JP-10 or Jet A. However, without significant advances in initiation technology, such fuels are not optimal for PDE operation due to the high energy input required for direct initiation of a detonation and the long deflagration-todetonation transition times associated with low-energy initiators. In an effort to utilize such conventional liquid fuels and still maintain the performance of the lighter and more sensitive hydrocarbon fuels, various fuel modification schemes such as thermal cracking, catalytic cracking, and partial oxidation have been investigated. We have examined the decomposition of JP-10 through thermal and catalytic cracking mechanisms at elevated temperatures using a benchtop reactor system. The system has the capability to vaporize liquid fuel at precise flow rates while maintaining the flow path at elevated temperatures and pressures for extended periods of time. The catalytic cracking tests were completed utilizing common industrial zeolite catalysts installed in the reactor. A gas chromatograph with a capillary column and flame ionization detector, connected to the reactor output, is used to speciate the reaction products. The conversion rate and product compositions were determined as functions of the fuel metering rate, reactor temperature, system backpressure, and zeolite type. An additional study was carried out to evaluate the feasibility of using pre-mixed rich combustion to partially oxidize JP-10. A mixture of partially oxidized products was initially obtained by rich combustion in JP-10 and air mixtures for equivalence ratios between 1 and 5. Following the first burn, air was added to the products, creating an equivalent stoichiometric mixture. A second burn was then carried out. Pressure histories and schlieren video images were recorded for both burns. The results were analyzed by comparing the peak and final pressures to idealized thermodynamic predictions.

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Kinetics of the Autoxidation of a Jet-A Fuel

Cited by 16 publications

References 19 publications

Homogeneous Oxidation Reactions of Propanediols at Low Temperatures

Homogeneous Oxidation Reactions of Propanediols at Low Temperatures

On the Development of Oxygen Scavenger Additives for Future Jet Fuels

Experiments Studying Thermal Cracking, Catalytic Cracking, and Pre-Mixed Partial Oxidation of JP-10

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