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Interaction of water droplets with pyrolyzing coal particles and tablets

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Defence Technology（防务技术） 2023年第12期30卷 1-12页

作者： Anastasia Islamova pav.l Tkachenko pav.l strizhak National Research Tomsk Polytechnic University Heat and Mass Transfer Laboratory30 Lenin AvenueTomsk634050Russia

The paper presents the experimental research findings for the patterns of collisions of water droplets with pressed tableted samples used as substrates and with small particles of a pyrolyzing solid *** coal samples were ***-substrate interactions were studied when varying the droplet diameter in the range from 1 to 4 mm and velocity from 0.5 to 4 m/*** corresponded to the Weber number range of *** coal tablet surface temperature was varied from 20 to 700℃.In the interactions of water droplets(0.7-1.5 mm in diameter,pre-collision velocity from 1 to 3 m/s)with coal particles(with a size of 0.2-1 mm,pre-collision velocity 0.7-2 m/s),the temperature of the latter was varied in the range of 330-480℃.The following regimes of the interaction of droplets with solid particles during chemical reactions and phase transformations were distinguished:spreading/agglomeration and break-up/*** in the characteristics of the interaction of water droplets with coal particles at varying temperatures were ***-particle interaction regime maps for B(We),We(Oh)and We(Ca)were *** collision regime boundaries were described using fitted curves that can be utilized to develop the existing mathematical models of droplet-particle collisions in *** was established that the gaseous volatile production in coal pyrolysis has a modest effect on the regimes and characteristics of the droplet destruction in the temperature range under consideration(20-700℃).

关键词： Droplet Particle Solid substrate Collision Agglomeration Separation

Methane oxidative carbonylation catalyzed by rhodium chalcogen halides over carbon supports

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Journal of Natural Gas Chemistry 2008年第1期17卷 1-7页

作者： G.R.Kosmambetoval P.E.strizhak V.I.Gritsenko S.V.Volkov l.B.Kharkova O.G.Yanko O.M.Korduban l.V Pisarzhevsky Institute of Physical Chemistry of National Academy of Sciences of Ukraine pr.Nauki 31Kiev03039Ukraine V.I.Vernadsky Institute of General and Inorganic Chemistry of National Academy of Sciences of Ukraine pr.PaUadina 32/34Kiev03680Ukraine V.I.Vernadsky Institute of General and Inorganic Chemistry of National Academy of Sciences of Ukraine pr.Palladina 32/34Kiev03680Ukraine G.V.Kurdyumov Institute of Metal Physics of National Academy of Sciences of Ukraine 36Vernadskij avKyiv03680Ukraine

Gas phase carbonylation of methane is studied in the presence of molecular oxygen over pure carbon carriers and carbon supported rhodium chalcogen halides. Activated carbons and fullerene blacks have been used as carbon supports. XPS and IR-spectroscopy data show the formation of rhodium chalcogen halides in solids prepared by different methods. We have found that the productivity of acetic acid by carbon supported rhodium chalcogen halides depends strongly on the carbon carrier and the method of the catalyst preparation. Namely, the catalyst with highest productivity for the acetic acid is prepared by synthesizing the rhodium chalcogen halide over the carbon support followed by thermal destruction. We have also found that rhodium chalcogen halides over activated carbons are more active compared with fullerene supported catalysts.

关键词： catalysts methane oxidative carbonylation rhodium chalcogen halides carbon supports

TPR Study of Core-Shell Fe@Fe<sub>3</sub>O<sub>4</sub>Nanoparticles Supported on Activated Carbon and Carbon Nanotubes

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Advances in Materials Physics and Chemistry 2012年第1期2卷 17-22页

作者： Igor Bychko Yevhen Kalishyn Peter strizhak l.V. Pisarzhevsky Institute of Physical Chemistry The National Academy of Sciences of Ukraine Kyiv Ukraine

Core-shell nanoparticles Fe@Fe3O4 supported on activated carbon (AC) and carbon nanotubes (CNTs) have been studied by H2 temperature-programmed reduction (TPR). Nanoparticles with size of 6.5 nm were synthesized by iron(II) oleate thermal decomposition and were supported on activated carbon and carbon nanotubes by colloid deposition method. The nanoparticles Fe@Fe3O4 are characterized by TEM and IR. Reduction of nanoparticles on AC starts at 140?C, whereas reduction of nanoparticles on CNTs starts at 200?C. Moreover, gasification of CNTs with methane releasing starts at 450?C, whereas gasification of AC is negligible at temperatures up to 800?C. All these findings illustrate a strong difference in the interaction between nanoparticles and the support material for AC and CNTs.

关键词： Iron Nanoparticles Carbon Nanotubes Temperature-Programmed Reduction

纳米级ZnO/MgO固体的合成及其对CO的氧化活性(英文)

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催化学报 2008年第11期29卷 1079-1083页

作者： Olga Z. DIDENKO Gulnara R. KOSMAMBETOVA Peter E. strizhak l.V.Pisarzhevsky Institute of Physical Chemistry of the National Academy of Sciences of Ukraine

The ZnO/MgO solid samples containing the ZnO nanoparticles of controllable size were prepared using colloidal technique. The catalytic performance of the ZnO/MgO samples for the CO oxidation was measured. It was revealed that the rate of the CO oxidation reaction on the ZnO nanoparticles with variable average radius (2.01-2.29 nm) shows nonmonotonic dependence caused by the quantum-confinement effect.

关键词：纳米氧化锌氧化镁催化剂氧化活性一氧化碳

Deposition of Monodisperse Platinum Nanoparticles of Controlled Size on Different Supports

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Advances in Nanoparticles 2013年第1期2卷 32-38页

作者： Zinaida Kaidanovych Yevhen Kalishyn Peter strizhak l.V. Pisarzhevsky Institute of Physical Chemistry The National Academy of Sciences of Ukraine Kyiv Ukraine

Monodisperse platinum nanoparticles with controlled size were synthesized by polyol synthesis and supported on γ-Al2O3, SiO2 and carbon nanotubes (CNT) by the colloid deposition method. The average size of Pt nanoparticles in colloidal solutions and on supports were determined by TEM images and from XRD patterns. The size of Pt nanoparticles supported on SiO2 and CNT determined from XRD patterns is in a good agreement with size obtained from the TEM analyses. There were shown that no agglomeration and size changing of Pt nanoparticles on these supports were observed. All these findings illustrate that the method of colloid deposition allows one to obtain catalyst with monodisperse platinum nanoparticles of controlled size deposited on different supports without changing the nanoparticle’s size and morphology.

关键词： Platinum Nanoparticles Pt/γ-Al2O3 Pt/SiO2 Pt/CNT

Catalytic perfomance of rhodium chalcogen halides and rhodium chalcogenides over silica supports in methane oxidative carbonylation

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Journal of Natural Gas Chemistry 2009年第4期18卷 399-406页

作者： S. V. Volkov G. R. Kosmambetova l. B. Kharkova O. V. Shvets O. G. Yanko V. I. Gritsenko P. E. strizhak V. I. Vernadskii Institute of General and Inorganic Chemistry of the Ukrainian National Academy of Sciences l. V. Pisarzhevsky Institute of Physical Chemistry of the Ukrainian National Academy of Sciences

The gas phase methane oxidative carbonylation was studied in the presence of molecular oxygen over silica materials including their mechanical mixtures with rhodium chalcogen chlorides obtained in non-aqueous inorganic media. The formation of Rh4SCl7, Rh4S9Cl2, Rh4SesCl3 and Rh3Se3Cl solids was confirmed by elemental analysis, IR absorption spectroscopy, XPS and X-ray diffraction. Silica, vanadium-, and molybdenum-containing mesoporous molecular sieves have been used as supports. It was found that productivity of oxygenates （methanol, methyl acetate and acetic acid） depends mainly on the method of the catalyst preparation and the type of the support.

关键词： catalysts rhodium chalcogen halides methane oxidative carbonylation silica supports

Genesis of H-ZSM-11 Acidity under Hydrogen and Water Vapor Treatment

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Journal of Chemistry and Chemical Engineering 2010年第7期4卷 24-28页

作者： Peter Eugenovich strizhak Vlasenko Nina Vasilievna Kochkin Yuriy Nickolaevich Kalishyn Yevhen Yurievieh Tel＇biz German Michailovich l. V. Pysarzhevsky Institute of Physical Chemistry National Academy of Sciences of Ukraine Prospect Nauki 31 Kiev 03039 Ukraine

1. Introduction Zeolites are widely used in acid heterogeneous catalysis [1, 2]. Due to the unique physical and chemical properties ofzeolites, they are widely used in commercial catalytic processes, such as fluidized catalytic cracking, hydrocracking, methanol conversion to gasoline or olefins, ethylbenzene production, xylene isomerization, aromatics hydrogenation [3-9]. Acidity, high thermal stability, and shape selectivity determine the use of zeolites as catalysts in reaction processes through acid mechanisms [ 10].

关键词： H-ZSM-11 acidity spectrum QETG method.

Interaction of water droplets with pyrolyzing coal particles and tablets

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