Combustion synthesis mechanism of the Ni(NO3)2 + hexamethylenetetramine solutions to prepare nickel nanomaterials

IF 5.8 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2023-11-01 DOI:10.1016/j.combustflame.2023.113049

Marieta K. Zakaryan , Narine H. Amirkhanyan , Khachik T. Nazaretyan , Suren L. Kharatyan , Khachatur V. Manukyan

{"title":"Combustion synthesis mechanism of the Ni(NO3)2 + hexamethylenetetramine solutions to prepare nickel nanomaterials","authors":"Marieta K. Zakaryan , Narine H. Amirkhanyan , Khachik T. Nazaretyan , Suren L. Kharatyan , Khachatur V. Manukyan","doi":"10.1016/j.combustflame.2023.113049","DOIUrl":null,"url":null,"abstract":"<div>This work reports the combustion synthesis mechanism in a system with hexamethylenetetramine (C6H12N4) as the fuel and nickel nitrate (Ni(NO3)2) as the oxidizer. Detailed investigations using combustion diagnostic methods, thermal analysis, and mass spectroscopy measurements allow us to propose that the process includes the multistage decomposition of the oxidizer and sublimation of the fuel. The latter decomposes at the gas phase and releases nitrogen (N2), hydrazine (N2H4), and methane (CH4). The nitrogen oxides (NO, NO2, N2O) emitted at the decomposition of Ni(NO3)2·2Ni(OH)2·4H2O intermediate, react with CH4 and N2H4. These highly exothermic reactions determine the maximum temperature of combustion. Comparative kinetic consideration allows us to attribute the Ni(NO3)2·2Ni(OH)2·4H2O decomposition producing nitrogen oxides and nickel oxide (NiO) as the rate-limiting stage of the process. Excessive amounts of N2H4 and CH4 in the fuel-rich system reduce NiO to nanoscale Ni. The synthesized Ni readily consolidates into samples with relative densities above 90%, even at 773 K during fast processing.</div>","PeriodicalId":280,"journal":{"name":"Combustion and Flame","volume":"257 ","pages":"Article 113049"},"PeriodicalIF":5.8000,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Combustion and Flame","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0010218023004248","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}

引用次数: 0

Abstract

This work reports the combustion synthesis mechanism in a system with hexamethylenetetramine (C₆H₁₂N₄) as the fuel and nickel nitrate (Ni(NO₃)₂) as the oxidizer. Detailed investigations using combustion diagnostic methods, thermal analysis, and mass spectroscopy measurements allow us to propose that the process includes the multistage decomposition of the oxidizer and sublimation of the fuel. The latter decomposes at the gas phase and releases nitrogen (N₂), hydrazine (N₂H₄), and methane (CH₄). The nitrogen oxides (NO, NO₂, N₂O) emitted at the decomposition of Ni(NO₃)₂·2Ni(OH)₂·4H₂O intermediate, react with CH₄ and N₂H₄. These highly exothermic reactions determine the maximum temperature of combustion. Comparative kinetic consideration allows us to attribute the Ni(NO₃)₂·2Ni(OH)₂·4H₂O decomposition producing nitrogen oxides and nickel oxide (NiO) as the rate-limiting stage of the process. Excessive amounts of N₂H₄ and CH₄ in the fuel-rich system reduce NiO to nanoscale Ni. The synthesized Ni readily consolidates into samples with relative densities above 90%, even at 773 K during fast processing.

查看原文本刊更多论文

燃烧合成Ni(NO3)2 +六亚甲基四胺溶液制备纳米镍材料的机理

本文报道了以六亚甲基四胺(C6H12N4)为燃料，硝酸镍(Ni(NO3)2)为氧化剂体系的燃烧合成机理。使用燃烧诊断方法、热分析和质谱测量的详细研究使我们提出，该过程包括氧化剂的多阶段分解和燃料的升华。后者在气相分解，释放出氮(N2)、肼(N2H4)和甲烷(CH4)。Ni(NO3)2·2Ni(OH)2·4H2O中间体分解时释放的氮氧化物(NO, NO2, N2O)与CH4和N2H4反应。这些高度放热的反应决定了燃烧的最高温度。比较动力学考虑允许我们将Ni(NO3)2·2Ni(OH)2·4H2O分解产生氮氧化物和氧化镍(NiO)作为该过程的限速阶段。富燃料体系中过量的N2H4和CH4将NiO还原为纳米级Ni。在快速处理过程中，即使在773 K下，合成的Ni也容易固结成相对密度超过90%的样品。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Combustion and Flame 工程技术-工程：化工

CiteScore

9.50

自引率

20.50%

发文量

631

审稿时长

3.8 months

期刊介绍： The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on: Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including: Conventional, alternative and surrogate fuels; Pollutants; Particulate and aerosol formation and abatement; Heterogeneous processes. Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including: Premixed and non-premixed flames; Ignition and extinction phenomena; Flame propagation; Flame structure; Instabilities and swirl; Flame spread; Multi-phase reactants. Advances in diagnostic and computational methods in combustion, including: Measurement and simulation of scalar and vector properties; Novel techniques; State-of-the art applications. Fundamental investigations of combustion technologies and systems, including: Internal combustion engines; Gas turbines; Small- and large-scale stationary combustion and power generation; Catalytic combustion; Combustion synthesis; Combustion under extreme conditions; New concepts.