Marieta K. Zakaryan , Narine H. Amirkhanyan , Khachik T. Nazaretyan , Suren L. Kharatyan , Khachatur V. Manukyan
{"title":"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","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><p><span>This work reports the combustion synthesis mechanism in a system with hexamethylenetetramine (C</span><sub>6</sub>H<sub>12</sub>N<sub>4</sub>) as the fuel and nickel nitrate (Ni(NO<sub>3</sub>)<sub>2</sub><span><span>) as the oxidizer. Detailed investigations using combustion diagnostic methods, thermal analysis, and mass spectroscopy measurements allow us to propose that the process includes the </span>multistage decomposition of the oxidizer and sublimation of the fuel. The latter decomposes at the gas phase and releases nitrogen (N</span><sub>2</sub>), hydrazine (N<sub>2</sub>H<sub>4</sub>), and methane (CH<sub>4</sub><span>). The nitrogen oxides (NO, NO</span><sub>2</sub>, N<sub>2</sub>O) emitted at the decomposition of Ni(NO<sub>3</sub>)<sub>2</sub>·2Ni(OH)<sub>2</sub>·4H<sub>2</sub>O intermediate, react with CH<sub>4</sub> and N<sub>2</sub>H<sub>4</sub><span>. These highly exothermic reactions determine the maximum temperature of combustion. Comparative kinetic consideration allows us to attribute the Ni(NO</span><sub>3</sub>)<sub>2</sub>·2Ni(OH)<sub>2</sub>·4H<sub>2</sub><span>O decomposition producing nitrogen oxides and nickel oxide (NiO) as the rate-limiting stage of the process. Excessive amounts of N</span><sub>2</sub>H<sub>4</sub> and CH<sub>4</sub><span> 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.</span></p></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":"{\"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><p><span>This work reports the combustion synthesis mechanism in a system with hexamethylenetetramine (C</span><sub>6</sub>H<sub>12</sub>N<sub>4</sub>) as the fuel and nickel nitrate (Ni(NO<sub>3</sub>)<sub>2</sub><span><span>) as the oxidizer. Detailed investigations using combustion diagnostic methods, thermal analysis, and mass spectroscopy measurements allow us to propose that the process includes the </span>multistage decomposition of the oxidizer and sublimation of the fuel. The latter decomposes at the gas phase and releases nitrogen (N</span><sub>2</sub>), hydrazine (N<sub>2</sub>H<sub>4</sub>), and methane (CH<sub>4</sub><span>). The nitrogen oxides (NO, NO</span><sub>2</sub>, N<sub>2</sub>O) emitted at the decomposition of Ni(NO<sub>3</sub>)<sub>2</sub>·2Ni(OH)<sub>2</sub>·4H<sub>2</sub>O intermediate, react with CH<sub>4</sub> and N<sub>2</sub>H<sub>4</sub><span>. These highly exothermic reactions determine the maximum temperature of combustion. Comparative kinetic consideration allows us to attribute the Ni(NO</span><sub>3</sub>)<sub>2</sub>·2Ni(OH)<sub>2</sub>·4H<sub>2</sub><span>O decomposition producing nitrogen oxides and nickel oxide (NiO) as the rate-limiting stage of the process. Excessive amounts of N</span><sub>2</sub>H<sub>4</sub> and CH<sub>4</sub><span> 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.</span></p></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}","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}
Combustion synthesis mechanism of the Ni(NO3)2 + hexamethylenetetramine solutions to prepare nickel nanomaterials
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.
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.
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