Eurasian Chemico-Technological Journal最新文献_第8页

Oxidation Characteristics of Water Soluble Fractions of Agro-Stalks with Focus on Function of Reactive Inorganics 秸秆水溶性组分的氧化特性及活性无机物的作用

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Eurasian Chemico-Technological Journal Pub Date : 2021-11-10 DOI: 10.18321/ectj1101

R. Zhao, F. He, F. Behrendt, J. Cai, A. Dieguez-Alonso, Y. Liu

引用次数: 0

Processing Conditions Optimization for the Synthesis and Consolidation of High-Entropy Diborides 高熵二硼化物合成与固结工艺条件优化

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Eurasian Chemico-Technological Journal Pub Date : 2021-11-10 DOI: 10.18321/ectj1104

S. Barbarossa, M. Murgia, R. Orrú, G. Cao

{"title":"Processing Conditions Optimization for the Synthesis and Consolidation of High-Entropy Diborides","authors":"S. Barbarossa, M. Murgia, R. Orrú, G. Cao","doi":"10.18321/ectj1104","DOIUrl":"https://doi.org/10.18321/ectj1104","url":null,"abstract":"The fabrication by Spark Plasma Sintering (SPS) of bulk high entropy ceramics from powders obtained by Self-propagating High temperature Synthesis (SHS) is addressed in this work. The effect produced by the introduction of 1 wt.% of graphite to the powders before SPS is investigated under different temperature conditions. The final density and composition of sintered (Hf0.2Mo0.2Zr0.2Ti0.2Ta0.2)B2 and (Hf0.2Mo0.2Zr0.2Ti0.2Nb0.2)B2 ceramics are found to be negatively affected by the presence of oxide impurities in the powders. While product composition can be progressively improved when the temperature is increased from 1800 to 1950 °C, residual porosities remain relatively high if using additive-free powders. In contrast, the introduction of 1 wt.%C markedly allows for oxides elimination by carbothermal reduction mechanism. Products consolidation is correspondingly enhanced so that relative densities of about 97% are attained. Other than the latter effect, surface oxides removal also makes powders more reactive, thus the synthesis of single-phase products is promoted. In particular, fully homogeneous (Hf0.2Mo0.2Zr0.2Ti0.2Ta0.2)B2 ceramics are obtained at relatively lower temperature conditions (1850 °C).","PeriodicalId":11795,"journal":{"name":"Eurasian Chemico-Technological Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45612948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Factors Influencing the Kinetics of Water Vapour Adsorption on Activated Carbons 影响活性炭吸附水蒸气动力学的因素

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Eurasian Chemico-Technological Journal Pub Date : 2021-11-10 DOI: 10.18321/ectj1102

Y. Boutillara, L. Richelet, L. F. Velasco, P. Lodewyckx

{"title":"Factors Influencing the Kinetics of Water Vapour Adsorption on Activated Carbons","authors":"Y. Boutillara, L. Richelet, L. F. Velasco, P. Lodewyckx","doi":"10.18321/ectj1102","DOIUrl":"https://doi.org/10.18321/ectj1102","url":null,"abstract":"The performance of porous carbon materials as sorbents is often compromised by the presence of humidity. Studying the kinetics of water vapour adsorption on activated carbons will undeniably help to overcome this issue. This has been approached in this work by evaluating the influence of several operational factors on the dynamic adsorption of water vapour in these materials. Specifically, different carbon types, particle sizes, air flows and ambient conditions (temperature and relative humidity (RH)) were systematically investigated. The impact of each isolated parameter on both the maximum water uptake and the uptake rate was analyzed by fitting the experimental data to the Linear Driving Force (LDF) kinetic model. The results show that except for the particle size, the studied variables play a role in the water sorption kinetics, although to a different extent. It was also confirmed that the LDF model can adequately describe the kinetics of water vapour adsorption independently of the experimental conditions. Finally, the complete water vapour adsorption process can be described by this model, obtaining a different value of the kinetic constant for the sequential stages, involving different adsorption mechanisms.","PeriodicalId":11795,"journal":{"name":"Eurasian Chemico-Technological Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47280938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modeling and Simulation of Janus-like Nanoparticles Formation by Solid-Gas Exothermic Reactions 固体-气体放热反应形成类janus纳米颗粒的建模与模拟

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Eurasian Chemico-Technological Journal Pub Date : 2021-11-10 DOI: 10.18321/ectj1098

A. Markov, K. Martirosyan

引用次数: 0

How Organic Waste Improves Bitumen’s Characteristics 有机废物如何改善沥青的特性

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Eurasian Chemico-Technological Journal Pub Date : 2021-11-10 DOI: 10.18321/ectj1106

P. Caputo, M. Porto, V. Loise, A. Abe, B. Teltayev, P. Calandra, C. Oliviero Rossi

引用次数: 1

Promoters for Improvement of the Catalyst Performance in Methane Valorization Processes 提高甲烷Valorization工艺催化剂性能的促进剂

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Eurasian Chemico-Technological Journal Pub Date : 2021-11-10 DOI: 10.18321/ectj1099

I. Ismagilov, A. Vosmerikov, L. L. Korobitsyna, E. Matus, M. Kerzhentsev, A. Stepanov, E. S. Mihaylova, Z. Ismagilov

{"title":"Promoters for Improvement of the Catalyst Performance in Methane Valorization Processes","authors":"I. Ismagilov, A. Vosmerikov, L. L. Korobitsyna, E. Matus, M. Kerzhentsev, A. Stepanov, E. S. Mihaylova, Z. Ismagilov","doi":"10.18321/ectj1099","DOIUrl":"https://doi.org/10.18321/ectj1099","url":null,"abstract":"In this work, the introduction of modifying additives in the composition of catalysts is considered as an effective mode of improving functional characteristics of materials for two processes of methane conversion into valuable products – methane dehydroaromatization (DHA of CH4) into benzene and hydrogen and autothermal reforming of methane (ATR of CH4) into synthesis gas. The effect of type and content of promoters on the structural and electronic state of the active component as well as catalyst activity and stability against deactivation is discussed. For DHA of CH4 the operation mode of additives M = Ag, Ni, Fe in the composition of Mo-M/ZSM-5 catalysts was elucidated and correlated with the product yield and coke content. It was shown that when Ag serves as a promoter, the duration of the catalyst stable operation is enhanced due to a decrease in the rate of the coke formation. In the case of Ni and Fe additives, the Ni-Мо and Fe-Mo alloys are formed that retain the catalytic activity for a long time in spite of the carbon accumulation. For ATR of CH4, the influence of M = Pd, Pt, Re, Mo, Sn in the composition of Ni-M catalysts supported on La2O3 or Ce0.5Zr0.5O2/Al2O3 was elucidated. It was demonstrated that for Ni-M/La2O3 catalysts, Pd is a more efficient promoter that improves the reducibility of Ni cations and increases the content of active Nio centers. In the case of Ni-M/Ce0.5Zr0.5O2/Al2O3 samples, Re is considered the best promoter due to the formation of an alloy with anti-coking and anti-sintering properties. The use of catalysts with optimal promoter type and its content provides high efficiency of methane valorization processes.\u0000\u0000","PeriodicalId":11795,"journal":{"name":"Eurasian Chemico-Technological Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45608238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Implementation of the Scalar Dissipation Rate in the REDIM Concept and its Validation for the Piloted Non-Premixed Turbulent Jet Flames REDIM概念中标量耗散率的实现及其对先导非预混湍流喷射火焰的验证

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Eurasian Chemico-Technological Journal Pub Date : 2021-11-10 DOI: 10.18321/ectj1100

C. Yu, U. Maas

引用次数: 0

Ethanol: Toxicity and Dangers in Women of Child-Bearing Age 乙醇对育龄妇女的毒性和危险

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Eurasian Chemico-Technological Journal Pub Date : 2021-11-10 DOI: 10.18321/ectj1105

P. Gard

{"title":"Ethanol: Toxicity and Dangers in Women of Child-Bearing Age","authors":"P. Gard","doi":"10.18321/ectj1105","DOIUrl":"https://doi.org/10.18321/ectj1105","url":null,"abstract":"The World Health Organisation estimates that alcohol abuse by adults accounts for about 5% of global disease burden. Additionally, prenatal alcohol exposure (PAE) causes ‘fetal alcohol spectrum disorder’ (FASD). Depending on severity, FASD is characterised by low birth weight, small head size at birth and growth retardation. There are also facial features of narrow eyes, flat upper lip and midface and impaired fine motor skills, hearing loss, poor hand-eye coordination and cognitive impairment. World-wide, up to 10% of children may be affected by PAE. It is unclear what dose or pattern of drinking results in these damaging effects, but animal models suggest that high, acute doses of ethanol (‘binge drinking’) in early pregnancy can result in the facial changes of FASD, whilst sustained, lower dose intake in later pregnancy produces anxiety and depression-like symptoms and deficits of learning and memory. The mechanisms underlying the deleterious effects of PAE are also unresolved, but evidence exists of long-lasting damage due to oxidative stress, increases in inflammatory mediators and changes to the brain renin-angiotensin system. There is also evidence of epigenetic changes. There is a need to prevent or limit the potential adverse effects of ethanol on the unborn child. It is highly unlikely, however, that all sexually-active women of child-bearing age not using reliable contraception will abstain from alcohol. There is therefore a need to research methods of reducing ethanol toxicity for the unborn child and / or develop therapeutic strategies to reverse the deleterious effects of ethanol on the unborn child.","PeriodicalId":11795,"journal":{"name":"Eurasian Chemico-Technological Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44791589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Advanced Battery Materials Research at Nazarbayev University: Review 纳扎尔巴耶夫大学先进电池材料研究综述

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Eurasian Chemico-Technological Journal Pub Date : 2021-11-10 DOI: 10.18321/ectj1103

I. Kurmanbayeva, A. Mentbayeva, A. Nurpeissova, Z. Bakenov

引用次数: 0

Ni/Cr-[α-SiW12O40] Layered Double Hydroxide as Effective Adsorbent of Iron(II) From Aqueous Solution Ni/Cr-[α-SiW12O40]层状双氢氧化物对水溶液中铁（II）的有效吸附

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Eurasian Chemico-Technological Journal Pub Date : 2021-08-30 DOI: 10.18321/ectj1080

A. Lesbani, M. F. Azmi, N. Palapa, T. Taher, R. Andreas, R. Mohadi

引用次数: 0