Catalytic Cracking of JP-10 over HZSM-5 Nanosheets

Tian, Yajie; Qiu, Yuan; Hou, Xu; Wang, Li; Liu, Guozhu

doi:10.1021/acs.energyfuels.7b02397

Cited by 33 publications

(31 citation statements)

References 47 publications

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“…NS-Z5 catalyst was synthesized using [C 22 H 45 N(CH 3 ) 2 C 6 H 12 N(CH 3 ) 2 C 6 H 13 ]Br 2 as an SDA [ 32 ]. Bulky HZSM-5 zeolite with a crystallite size along the long axis (Z5) of approximately 400 nm was prepared in the presence of tetrapropylammonium hydroxide (TPAOH).…”

Section: Methodsmentioning

confidence: 99%

Effects of Crystallite Sizes of Pt/HZSM-5 Zeolite Catalysts on the Hydrodeoxygenation of Guaiacol

et al. 2020

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Herein, Pt/HZSM-5 zeolite catalysts with different crystallite sizes ranging from nanosheet (~2 nm) to bulk crystals (~1.5 μm) have been prepared for the hydrodeoxygenation of guaiacol, and their effects on the reaction pathway and product selectivity were explored. HZSM-5 zeolites prepared by seeding (Pt/Z-40: ~40 nm) or templating (Pt/NS-2: ~2 nm) fabricated intra-crystalline mesopores and thus enhanced the reaction rate by promoting the diffusion of various molecules, especially the bulky ones such as guaiacol and 2-methoxycyclohexanol, leading to a higher cyclohexane selectivity of up to 80 wt % (both for Pt/Z-40 and Pt/NS-2) compared to 70 wt % for bulky HZSM-5 (Pt/CZ: ~1.5 μm) at 250 °C and 120 min. Furthermore, decreased crystallite sizes more effectively promoted the dispersion of Pt particles than bulky HZSM-5 (Pt/Z-400: ~400 nm and Pt/CZ). The relatively low distance between Pt and acidic sites on the Pt/Z-40 catalyst enhanced the metal/support interaction and induced the reaction between the guaiacol molecules adsorbed on the acidic sites and the metal-activated hydrogen species, which was found more favorable for deoxygenation than for hydrogenation of oxygen-containing molecules. In addition, Pt/NS-2 catalyst with a highly exposed surface facilitated more diverse reaction pathways such as alkyl transfer and isomerization.

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Section: Methodsmentioning

confidence: 99%

Effects of Crystallite Sizes of Pt/HZSM-5 Zeolite Catalysts on the Hydrodeoxygenation of Guaiacol

et al. 2020

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“…Therefore, JP-10 is thought to react preferentially with the acidic sites of the mesopores. 13,34,35 Extensive research exists from the material science community on the cracking of JP-10 in the presence of these zeolites. Due to the limited space in this journal, only key findings will be reported, which are important to place the present experiments into context.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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.

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“…4,50 In subcritical conditions, the synthesis of nanosheets of ZSM-5 seem to show an increase in conversion and lower deactivation rates due to the higher diffusivity of fuel towards the active sites. 51,52 Many groups have reported the use of n-decane or ndodecane as model compound to represent kerosene. Therefore, the construction of a kinetic model based on the cracking of n-decane and n-dodecane in subcritical and supercritical conditions on HSZM-5 has shown the contribution of supercritical conditions for an increased catalyst activity and a decreased coke deposition on the catalyst.…”

Section: Promising Catalysts Reported In Literaturementioning

confidence: 99%

Endothermic catalytic cracking of liquid hydrocarbons for thermal management of high-speed flight vehicles

Hubesch

Mazur

Selvakannan

et al. 2022

Sustainable Energy Fuels

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Catalytic Cracking of JP-10 over HZSM-5 Nanosheets

Cited by 33 publications

References 47 publications

Effects of Crystallite Sizes of Pt/HZSM-5 Zeolite Catalysts on the Hydrodeoxygenation of Guaiacol

Effects of Crystallite Sizes of Pt/HZSM-5 Zeolite Catalysts on the Hydrodeoxygenation of Guaiacol

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

Endothermic catalytic cracking of liquid hydrocarbons for thermal management of high-speed flight vehicles

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