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排序方式: 共有182条查询结果,搜索用时 15 毫秒
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Elena A. Lashina Elena M. Slavinskaya Nataliya A. Chumakova Gennadii A. Chumakov Andrei I. Boronin 《国际化学动力学杂志》2019,51(12):918-930
The results of temperature-programmed reaction experimental studies and mathematical modeling of self-sustained oscillations within an inverse temperature hysteresis in CO oxidation over Pd catalyst are presented. The experimental data demonstrate the influence of the reaction medium on the catalyst activity under reaction conditions. Under oxygen excess in the feeding gas mixture and high temperature, the defects appeared on the initially flat surface of metallic palladium due to deep oxidation of palladium (three-dimensional PdO nanoparticles were observed). The palladium oxide reduced under cooling of the catalytic system, and the catalyst surface became flat again. To take into account these variations of the palladium surface structure, we consider the piecewise-constant dependence of the rate constant of some reaction step on the concentrations of oxygen species, namely, the dissolved oxygen or oxide in the palladium bulk. The proposed model of the process in the cascade of continuous stirred-tank reactors that account for these dependences qualitatively describes the inverse temperature hysteresis as well as the oscillatory dynamics within the hysteresis loop which were obtained experimentally. 相似文献
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Kovalev I. V. Mal’bakhova I. A. Vorob’ev A. M. Borisenko T. A. Popov M. P. Matvienko A. A. Titkov A. I. Nemudryi A. P. 《Russian Journal of Electrochemistry》2021,57(10):1019-1027
Russian Journal of Electrochemistry - Abstract—The results on the gas permeability of oxygen- and hydrogen-permeable microtube membranes are shown. For oxygen-permeable microtube membranes of... 相似文献
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Christian Werner Grigorii Kokhanenko Gennadii Matvienko Vitalii Shamanaev Yurii Grachjov Igor Znamenskii Ulrich G. Oppel 《Optical Review》1995,2(3):221-224
First, in this report an overview is given on the use of the Russian laser altimeter in space “LORA” as a lidar for cloud measurements. Secondly, the influence of multiple scattering is verified by analysis of the backscatter signals from clouds having the excellent range resolution of a rangefinder.Presented at the 7th International Workshop on Multiple Scattering Lidar/Light Experiments (MUSCLE7), July 21–23 1994, Chiba, Japan. 相似文献
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O. I. Kachurin A. P. Zaraiskii L. I. Velichko N. A. Zaraiskaya N. M. Matvienko Z. A. Okhrimenko 《Russian Chemical Bulletin》1995,44(10):1815-1821
Electrophilic substitution in aromatic compounds under conditions of phase-transfer catalysis is considered. Catalysts of phase transfer of electrophilic reagents are used; their efficiency and the mechanism of their action in organic solvent-water systems are discussed.This review is based on materials of the report delivered at the Conference Phase-Transfer Catalysis. New Ideas and Methods (March 1994).Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 1895–1900, October, 1995. 相似文献
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Tatýana E. Glotova Nadezhda I. Protsuk Alexander I. Albanov Valentin A. Lopyrev Gennadii V. Dolgushin 《Central European Journal of Chemistry》2003,1(3):222-232
The nucleophilic addition of 2,4-dithiobiurete, 1- and 1,4-substituted 2,4-dithiobiuretes (2 a-e) with benzoylacetylene (1) has been studied. 2-(Benzoylmethyl)-4-(R1-imino)-6-(R2-imino)dihydro-4H-1,3,5-dithiazinium perchlorates (3 a-e) are obtained in glacial acetic acid (AcOH) in the presence of equimolar quantities of HClO4. The reaction of benzoylacetylene with 1,5-diphenyl-2,4-dithiobiurete in either of MeOH, C6H6, or MeCN solvents proceeds non-selectively to give a mixture of products such as 2-(benzoylmethyl)-4,6-di(phenylimino)dihydro-4H-1,3,5-dithiazine
(5), 2-(benzoylmethyl)-4-(β-benzoylvinyl)thio-3-phenyl-6-(phenylimino)-3,6-dihydro-2H-1,3,5-thiadiazine (8), 2-(benzoylmethyl)-1,3-diphenylhexahydro-1,3,5-triazine-4,6-dithione (7) and N-(β-benzoylvinyl)-N-phenylthioureas (6). 相似文献