Flash-ignition of carbon black synthesized from acetylene diffusion flames and its application as ignition agents

Fuel, Год журнала: 2023, Номер 349, С. 128605 - 128605

Опубликована: Май 13, 2023

Язык: Английский

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Thermal recombination strategy designed R-CN as active shell to improve catalyst activity

Surfaces and Interfaces, Год журнала: 2024, Номер 51, С. 104639 - 104639

Опубликована: Июнь 18, 2024

Язык: Английский

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Carbon Nanotube-Embedded Metal Carbonyl Compound Nanocomposites: Efficient Catalysts for Thermal Decomposition of Ammonium Perchlorate

Опубликована: Янв. 1, 2023

Adding burning-rate catalysts (BRCs) is highly effective for enhancing ammonium perchlorate (AP) thermal decomposition. To mitigate BRCs’ agglomeration and enhance their catalytic activity AP pyrolysis, five metal carbonyl compounds (Mo(CO)6, Cr(CO)6, W(CO)6, Fe2(CO)9, Mn2(CO)10) were refined into oxidized carbon nanotube (CNTs) cavities, respectively, by ultrasonication. The structures of the as-prepared nanocomposites examined with TEM, SEM, XPS, Raman, etc., confirming successful filling compounds. Electrochemical studies revealed that Mo(CO)6@CNTs(N1) exhibited an enhanced electron transfer rate superior electrocatalytic performance compared to CNTs(N1). Their evaluated DSC showed 5 wt.% exhibits best effect, increasing heat release 2904.63 J·g-1, advancing its peak temperature 80.6 oC, decreasing activation energy 100.45 KJ·mol-1. degradation mechanism catalyzed was probed through TG-FTIR-MS, in-situ solid FTIR, theoretical calculations. investigations suggested promoter in generates nanotubes-confined MoO3 nanoparticles featuring numerous Lewis Brønsted acidic sites, which not only improves NH3 adsorption but also enhances accelerates O2 conversion O2-, thereby facilitating pyrolysis. Finally, a plausible decomposition postulated.

Язык: Английский

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In Situ Synthesis Nio@Tio2/Mxene as a Promoter for Ammonium Perchlorate Based Solid Propellants

Опубликована: Янв. 1, 2023

The carrier can widely affect or even dominate the catalytic activity and selectivity of nanoparticles for ammonium perchlorate. In this work, a novel catalyst was fabricated using two-dimensional MXene as through simple hydrothermal method NiO@TiO2/MXene (TN) nanocomposite. System characterization indicates that supports promote good dispersion NiO nanoparticles. TiO2/MXene itself has large specific surface area, thus it regulate NiO. TN is superior to in promoting high temperature decomposition AP. By increasing concentration Ni2+ precursor, load on increased, ability AP improved. With increase load, decreased from 437.3°C 313.3°C, Ea 216.1kJ/mol 114.6kJ/mol, heat release increased by 118%. NH3-TPD O2-TPD have shown stronger adsorption capacity catalysts NH3 O2 surface, better their performance, indicating differences performance. TG/FT-IR further nanocomposites accelerate conversion N2O NO, which beneficial rapid

Язык: Английский

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Preparation of Carbon Nanotube-Filled Bismuth/Tin Green Nanocomposites and Their Efficient Catalytic Activity in the Thermal Decomposition of Ammonium Perchlorate

Опубликована: Янв. 1, 2023

The practical utility of bismuth and tin compounds, as promising green combustion catalysts, is constrained by their substantial particle agglomeration. Herein, we reported a straightforward ultrasonication-assisted method to incorporate compounds into the inner spaces carbon nanotubes (CNTs), giving CNTs-confined (tin) compounds. as-prepared nanocomposites were structurally completely characterized. electrochemical property investigations showed that introduction increases catalytic active sites inhibits nanoparticle agglomeration effectively. theoretical calculations revealed synergistic effects between Bi2O3 can improve efficiency electron transfer in Bi(NO3)3@A-CNTs(M1) composite. evaluation results performance on ammonium perchlorate (AP) pyrolysis suggested adding 5 wt. % DBT@A-CNTs(M1) (DBT = Dibutyltin dichloride) AP brought about more concentrated thermal decomposition process, advancing peak high-temperature stage from 420.4 °C 328.9 325.9 °C, respectively, boosting its heat release 976.42 J·g-1 2251.2 2452.03 J·g-1, respectively. studies degradation mechanism AP, probed kinetics, in-situ solid FTIR TG-FTIR-MS, concluded critical steps ClO4- NH4+ O2 O2- accelerated interaction formed nanoparticles nanotubes, relative contents stable gases, ultimately promoting pyrolysis. A tentative finally proposed.

Язык: Английский

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Carbon Nanotube-Embedded Metal Carbonyl Compound Nanocomposites: Efficient Catalysts for Thermal Decomposition of Ammonium Perchlorate

Опубликована: Янв. 1, 2023

Adding burning-rate catalysts (BRCs) is highly effective for enhancing ammonium perchlorate (AP) thermal decomposition. To mitigate BRCs’ agglomeration and enhance their catalytic activity AP pyrolysis, five metal carbonyl compounds (Mo(CO)6, Cr(CO)6, W(CO)6, Fe2(CO)9, Mn2(CO)10) were refined into oxidized carbon nanotube (CNTs) cavities, respectively, by ultrasonication. The structures of the as-prepared nanocomposites examined with TEM, SEM, XPS, Raman, etc., confirming successful filling compounds. Electrochemical studies revealed that Mo(CO)6@CNTs(N1) exhibited an enhanced electron transfer rate superior electrocatalytic performance compared to CNTs(N1). Their evaluated DSC showed 5 wt.% exhibits best effect, increasing heat release 1850.62 J·g-1, advancing its peak temperature 80.6 oC, decreasing activation energy 100.45 KJ·mol-1. degradation mechanism catalyzed was probed through TG-FTIR-MS, in-situ solid FTIR, theoretical calculations. investigations suggested promoter in generates nanotubes-confined MoO3 nanoparticles featuring numerous Lewis Brønsted acidic sites, which not only improves NH3 adsorption but also enhances accelerates O2 conversion O2-, thereby facilitating pyrolysis. Finally, a plausible decomposition postulated.

Язык: Английский

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