Effects of acetonitrile-assisted ball-milled aluminum nanoparticles on the ignition of acoustically levitated exo-tetrahydrodicyclopentadiene (JP-10) droplets

Brotton, Stephen J.; Malek, Marc J.; Anderson, Scott L.; Kaiser, Ralf I.

doi:10.1016/j.cplett.2020.137679

Cited by 20 publications

(32 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is mostly due to the high energy density (84 kJ cm −3 ) and high surface-area-to-volume ratio of the Al NPs present in zeolite-JP-10 samples. 47,49 Second, in the present work, reactive intermediates, individual atoms, and final oxidation products produced by the catalytic oxidation of JP-10 over HZSM-5 were identified by UV−vis emission spectroscopy and FTIR spectroscopy (Figures 6−8). However, before discussing the emission features in the UV−vis emission spectra (Figures 6 and 7) of zeolite-JP-10 systems (systems a−d), it is important to understand how these emission lines and bands are generated in Figures 6 and 7.…”

Section: The Journal Ofmentioning

confidence: 78%

“…were not caused by heat, but the emissions of the intermediates and products were the result of electronically excited states formed through chemical reactions (chemiluminescence). In Figure 7, UV−vis emission spectra of zeolite-Al-JP-10 systems (systems b and d) did not show any significant peaks for the dominating diatomic species (AlO) formed in the oxidation of aluminum; 47,48 thus, all four zeolite systems (systems a−d) behaved similar to each other. The absence of AlO peaks in the zeolite-Al-JP-10 systems could be due to two reasons.…”

Section: The Journal Ofmentioning

confidence: 93%

“…Finally, the temperatures above the autoignition of JP-10 (509 K) 3,9,47 were calibrated in the temperature temporal profile by extracting the emissivity of the flame. 47 3. RESULTS 3.1.…”

Section: Acoustic Levitation Apparatus Andmentioning

confidence: 99%

“…67 It is also noted that the UV−vis emission spectra of the zeolite-Al-JP-10 droplets did not show any significant peaks for aluminum monoxide (AlO)the dominating diatomic species formed in the oxidation of aluminum. 47,48 This could be due to the lower flame temperatures observed for the zeolite-Al-JP-10 samples (2200 K) versus 2690 K for systems without the zeolites, 47 thus eliminating any chemiluminescence of AlO. The spectral comparison of the UV−vis reflectance spectra are compiled in the Supporting Information (Figures S1 and S2).…”

Section: Uv−vis Emissionmentioning

confidence: 99%

“…One is the lower flame temperatures observed for the zeolite-Al-JP-10 samples (2200 K) versus 2690 K for systems without the zeolites. 47,48 The lower flame temperatures in zeolite-Al-JP-10 samples are possibly due to the deactivation of the zeolite catalyst by coke formation and dealumination processes during the decomposition and oxidation of JP-10. An alternative possibility could be the involvement of AlO in the dealumination process of the zeolite framework to slow down the dealumination rate at higher temperatures (Figure 5b).…”

Section: The Journal Ofmentioning

confidence: 99%

See 4 more Smart Citations

Catalytic Effects of Zeolite Socony Mobil-5 (ZSM-5) on the Oxidation of Acoustically Levitated exo-Tetrahydrodicyclopentadiene (JP-10) Droplets

et al. 2021

Self Cite

View full text Add to dashboard Cite

Jet propulsion 10 (JP-10) droplets with and without aluminum nanoparticles in conjunction with HZSM-5 zeolite and surfactants were ultrasonically levitated, and their oxidation processes were explored to identify how the oxidation process of JP-10 is catalytically affected by the HZSM-5 zeolites and how the surfactant and Al NPs in the system impacted the key experimental parameters of the ignition such as ignition delay time, burn rate, and the maximum temperatures. Singly levitated droplets were ignited using a carbon dioxide laser under an oxygen−argon atmosphere. Pure JP-10 droplets and JP-10 droplets with silicon dioxide of an identical size distribution as the zeolite HZSM-5 did not ignite in strong contrast to HZSM-5-doped droplets. Acidic sites were found to be critical in the ignition of the JP-10. With the addition of the surfactant, the characteristic features of the JP-10 ignition were improved, so the ignition delay time of the zeolite-JP-10 samples were decreased by 2−3 ms and the burn rates were increased by 1.3 to 1.6 × 10 5 K s −1 . The addition of Al NPs increased the maximum temperatures during the combustion of the systems by 300−400 K. Intermediates and end products of the JP-10 oxidation over HZSM-5 were characterized by UV−vis emission and Fourier-transform infrared transmission spectroscopies, revealing key reactive intermediates (OH, CH, C 2 , O 2 , and HCO) along with the H 2 O molecules in highly excited rovibrational states. Overall, this work revealed that acetic sites in HZSM-5 are critical in the catalytic ignition of JP-10 droplets with the addition of the surfactant and Al NPs, enhancing the oxidation process of JP-10 over HZSM-5 zeolites.

show abstract

Section: The Journal Ofmentioning

confidence: 78%

Section: The Journal Ofmentioning

confidence: 93%

“…Finally, the temperatures above the autoignition of JP-10 (509 K) 3,9,47 were calibrated in the temperature temporal profile by extracting the emissivity of the flame. 47 3. RESULTS 3.1.…”

Section: Acoustic Levitation Apparatus Andmentioning

confidence: 99%