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Effect of coal mine organic aerosol on the methane/air lower explosive limit

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International Journal of Coal Science & Technology 2020年第4期7卷 778-786页

作者： S.V.Valiulin A.A.Onischuk A.M.Baklanov A.A.Bazhina D.Yu.Paleev V.V.Zamashchikov A.A.Korzhavin S.N.Dubtsov Voevodsky institute of chemical kinetics and combustion Novosibirsk 630090Russia Novosibirsk State University Novosibirsk 630090Russia Novosibirsk State Pedagogical University Novosibirsk 630126.Russia institute of Coal.Kemerovo 650610 Russia

Organic aerosol is formed in coal mines due to heat release and evaporation of organics from coal during the longwall *** frictional heating occurs when a metallic cutting bit strikes a *** formed organic aerosol can contribute significantly to the explosivity of methane/air atmosphere in coal *** this paper,the flammable limits for the methane-air mixtures with organic aerosol are *** this purpose,organic aerosol is synthesizes from the coal-tar pitch in a laboratory evaporation-nucleation flow *** particles synthesized under laboratory conditions are aggregates consisting of small primary particles with the fractal-like dimension Df=2.0±0.1,which is close to Df=2.1±0.1 of coal mine *** is shown that the flammability of organic aerosol/methane mixture in air is in good agreement with the Le Chatelier additive *** lower ignition limit for the pure organic aerosol in air is 44 g/m^3.

关键词： Organic aerosol Explosivity of aerosol Coal mine Methane-air mixtures Agglomeration

Simulation of hydrocarbons pyrolysis in a fast-mixing reactor

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Chinese Journal of chemical Engineering 2015年第6期23卷 941-953页

作者： M.G.Ktalkherman I.G.Namyatov Khristianovich institute of Theoretical and Applied Mechanics Russian Academy of ScienceSiberian Branch Voevodsky institute of chemical kinetics and combustion Russian Academy of ScienceSiberian Branch

Currently, thermal decomposition of hydrocarbons for the production of basic petrochemicals(ethylene, propylene) is carried out in steam-cracking processes. Aside from the conventional method, under consideration are alternative ways purposed for process intensification. In the context of these activities, the method of hightemperature pyrolysis of hydrocarbons in a heat-carrier flow is studied, which differs from previous ones and is based on the ability of an ultra-short time of feedstock/heat-carrier mixing. This enables to study the pyrolysis process at high temperature(up to 1500 K) at the reactor inlet. A set of model experiments is conducted on the lab scale facility. Liquefied petroleum gas(LPG) and naphtha are used as a feedstock. The detailed data are obtained on temperature and product distributions within a wide range of the residence time. A theoretical model based on the detailed kinetics of the process is developed, too. The effect of governing parameters on the pyrolysis process is analyzed by the results of the simulation and experiments. In particular, the optimal temperature is detected which corresponds to the maximum ethylene yield. Product yields in our experiments are compared with the similar ones in the conventional pyrolysis method. In both cases(LPG and naphtha), ethylene selectivity in the fast-mixing reactor is substantially higher than in current technology.

关键词： Liquefied petroleum gas Pyrolysis Olefins Fast-mixing reactor

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On the Question of Defining the Association Constants by the Method of Fluorescence Quenching

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American Journal of Analytical Chemistry 2014年第16期5卷 1065-1068页

作者： Nikolay L. Lavrik Nikolay M. Bazhin Voevodsky institute of chemical kinetics and combustion SB RAS Novosibirsk Russian Federation

A study is made on the previously ignored problem of the dependence of a static fluorescence quenching Stern-Volmer constant?Ksv on the initial concentration of [F]0 fluorophore F. This correlation is shown to exist. ... 详细信息

关键词： Fluorescence Quenching Association Constants Stern-Volmer Constant

Boosting bidirectional sulfur conversion enabled by introducing boron-doped atoms and phosphorus vacancies in Ni2P for lithium-sulfur batteries

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Journal of Energy Chemistry 2025年第01期 760-769页

作者： Lin Peng Yu Bai Hang Li Meixiu Qu Zhenhua Wang Kening Sun Advanced Research institute of Multidisciplinary Science Beijing Institute of Technology Beijing Key Laboratory of chemical Power Source and Green Catalysis School of Chemistry and Chemical Engineering Beijing Institute of Technology

Lithium-sulfur （Li-S） batteries have gained great attention due to the high theoretical energy density and low cost,yet their further commercialization has been obstructed by the notorious shuttle effect and sluggish redox ***,we supply a strategy to optimize the electron structure of Ni2P by concurrently introducing B-doped atoms and P vacancies in Ni2P （Vp-B-Ni2P）,thereby enhancing the bidirectional sulfur *** study indicates that the simultaneous introduction of B-doped atoms and P vacancies in Ni2P causes the redistribution of electron around Ni atoms,bringing about the upward shift of d-band center of Ni atoms and effective d-p orbital hybridization between Ni atoms and sulfur species,thus strengthening the chemical anchoring for lithium polysulfides （LiPSs） as well as expediting the bidirectional conversion kinetics of sulfur ***,theoretical calculations reveal that the incorporation of B-doped atoms and P vacancies in Ni2P selectively promotes Li2S dissolution and nucleation ***,the Li-S batteries with Vp-B-Ni2P-separators present outstanding rate ability of 777 m A h g-1at 5 C and high areal capacity of 8.03 mA h cm-2under E/S of 5μL mg-1and sulfur loading of 7.20 mg *** work elucidates that introducing heteroatom and vacancy in metal phosphide collaboratively regulates the electron structure to accelerate bidirectional sulfur conversion.

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The Analysis of the Quenching Efficiency of Humic Acid Fluorescence by Cadmium and Copper Ions

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American Journal of Analytical Chemistry 2014年第17期5卷 1167-1173页

作者： Nikolay L. Lavrik Nurullo U. Mulloev Siberian Branch of the Russian Academy of Sciences Voevodsky Institute of Chemical Kinetics and Combustion Novosibirsk Russia

In conditions of monochromatic excitation (λexc=337.1), the spectral dependence of the efficiency of fluorescence quenching αλ of humic acids samples by Cd2+ and Cu2+ ions was studied. The difference of αλ dependencies for these ions was established. In the spectral range 350 - 650 nm, changes of the αλ for Cd2+ ion are markedly different from the magnitude for changes αλ, which occur for ion Cu2+. The interpretation of mismatch dependences obtained αλ ions Cd2+ and Cu2+ is carried out within the concept of the availability of different sites, due to the difference in ionic radii (0.108 nm and 0.08 nm for Cd2+ and Cu2+, respectively).

关键词： Structure of Humic Acids Spectral Dependence of Fluorescence Quenching Cd2+ and Cu2+ Ions

Photochemical Decomposition of Pesticide chemicals in Aerosol Particles and Thin Films Relevant to Environmental Conditions

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Journal of Chemistry and chemical Engineering 2014年第3期8卷 286-301页

作者： Yuri N. Samsonov Siberian Branch of the Russian Academy of Sciences Institute of Chemical Kinetics and Combustion Novosibirsk 630090 Russia

Contamination of the environment by pesticides is the inevitable aftermath of plant protection, and a substantial portion of pesticide pollutants exists in the form of aerosol particles levitated in the air and deposited on plants, and as the pesticide residues （thin films） on the surface of plant leaves. The sunlight photolysis could be the resource for the accelerated photochemical decomposition of pesticide compounds to minimize the long-term environmental contamination. The rates of photochemical decomposition of pesticide chemicals propiconazole （commercial formulation Tilt） and haloxyfop-ethoxyethyl （Zellek） were measured in particles of 0.12-1.3 μm in diameter and in films 0.04-0.2 μm thick. A specific polyaromatic sensitizer Shirvanol was used to induce accelerated decomposition of the above pesticide particulates under both the solar radiation and the artificial UV light. It was established that propiconazole decomposes by the sensitized photo-oxidation only, but haloxyfop-ethoxyethyl reacts in both the oxygen （air） and oxygen-free mediums via both the direct and sensitized reactions. The photochemical mechanisms are hypothesized and argued for the oxidative and non-oxidative decompositions. The haloxyfop-ethoxyethyl （Zellek） residues lbrmed on foliage upon pesticide treatments of agricultural fields would essentially decompose under sunlight via a direct photoreaction in 4-6 weeks, but the propiconazole （Tilt） contaminants probably need more time.

关键词： Pesticide propiconazole haloxyfop-ethoxyethyl aerosol particles thin films photochemical decomposition.

Test on Evaluation Method for Biodegradability of Lubricants

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Transactions of Tianjin University 2008年第1期14卷 61-65页

作者：杨礼河朱勇范国琛孙玉德解世文 Internal combustion Engine Research institute Tianjin University School of chemical Engineering and Technology Tianjin University

Using carbon tetrachloride （CCl4） as extraction agent, the activated sludge from Tianjin Jizhuangzi Sewage Treatment Plant as inoculum, the test study on biodegradability of lubricants was carried out. The test flasks containing the mineral medium, the test oil and the inoculum were placed in incubation together with flasks containing poisoned blanks for periods of 0 and 21 days, respectively. Flasks containing the reference materials in place of the test oil were run in parallel. At the end of the incubation period, the contents of the flasks were subjected to sonic vibration, and were acidified and extracted by using CCI4. The extracts were then analysed by infra-red （IR） spectrometer to measure the maximum absorption of the C-H stretch of CH2-CH3 band at wavelength of 2 930 cm^-1. The absorption values were used to calculate the residual oil contents of the poisoned and test flasks. Consequently the biodegradability of the test oil was calculated. The test results indicate that the differences in the biodegradability of test materials in different tests are within 5.5%, and consistent with the data described in Coordinating European Council （CEC） L-33- A-93. The biodegradability of lubricants can be evaluated by this method effectively.

关键词： biodegradability lubricant evaluating test CEC L-33-A-93

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Kinetic-compartmental modelling of potassium-containing cellulose feedstock gasification

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Frontiers of chemical Science and Engineering 2018年第4期12卷 708-717页

作者： Attila Egedy Livia Gyurik Tamas Varga Jun Zou Norbert Miskolczi Haiping Yang institute of chemical and Process Engineering University of PannoniaVeszprem 8200Hungary State Key Laboratory of Coal combustion Huazhong University of Science and TechnolgyWuhan 430074China

Biomass is of growing interest as a secondary energy source and can be converted to fuels with higher energy density especially by pyrolysis or gasification. Understanding the mechanism and the kinetics of biomass pyrolysis (thermal decomposition) and gasification (conversion of organic material to gases) could be the key to the design of industrial devices capable of processing vast amounts of biomass feedstock. In our work real product components obtained in pyrolysis were took into consideration as well as char and oil as lumped components, and the kinetic constants for a biomass model compound (cellulose) pyrolysis and gasification were identified based on a proposed simplified reaction mechanism within a compartment model structure. A laboratory scale reactor was used for the physical experiments containing consecutive fast pyrolysis and gasification stages using alkali metal (K) containing feedstock, which has a significant effect on the cellulose pyrolysis and gasification. The detailed model was implemented in MATLAB/Simulink environment, and the unknown kinetic parameters were identified based on experimental data. The model was validated based on measurement data, and a good agreement was found. Based on the validated first principle model the optimal parameters were determined as 0.15 mL/min steam flow rate, and 4% K content.

关键词： biomass pyrolysis kinetic parameter identification compartment modelling optimisation

Essential Oils from Different Parts of the Sea Buckthorn <i>Hippophae rhamnoides</i>L.

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Advances in Bioscience and Biotechnology 2019年第8期10卷 233-243页

作者： Nikolay M. Slynko Leonid V. Kuibida Ludmila E. Tatarova George U. Galitsyn Tatiana N. Goryachkovskaya Sergey E. Peltek The Federal Research Center Institute of Cytology and Genetics SB RAS Novosibirsk Russia institute of chemical kinetics and combustion SB RAS Novosibirsk Russia

The study investigated essential oils of berries and green biomass of the sea buckthorn at various growth stages. Plant material of H. rhamnoídes ssp. mongolica was collected in the experimental fields of the institute of Cytology and Genetics SB RAS (Siberia, Russia). Volatile compounds and essential oils were detected. Green spring shoots without leaves, first-year seedlings without leaves and berries were analyzed. In all studied exemplars, 103 volatile compounds were defined among which considerable proportion wasn’t found in a sea-buckthorn earlier. Phenylpropanoids prevailed in essential oils composition from seedlings. Alkanes and phenylpropanoids prevailed in shoots. Berries contained mostly carboxylic acids and their esters. These data can be applied to a fingerprint of various cultivars of a sea-buckthorn with relevance to food science and technology.

关键词： Hippophae rhamnoídes Essential Oils Volatile Compounds Gas Chromatography-Mass Spectrometry (GC-MS) Analysis Chemotaxonomy