共查询到20条相似文献,搜索用时 15 毫秒
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The invention of Fe1-xO based catalyst for ammonia synthesis and the discovery of a double peak shape curve between catalytic activity and precursor phase composition (Fe2+/Fe3+) is a breakthrough in the field of ammonia synthesis. 相似文献
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Kharchenko V. G. Blinokhvatov A. F. Mityurina K. V. Parnes Z. N. Kursanov D. N. 《Russian Chemical Bulletin》1976,25(3):594-597
Russian Chemical Bulletin - 相似文献
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G. A. Abakumov V. A. Tsaryapkin L. V. Gorbunova V. K. Cherkasov 《Russian Chemical Bulletin》1979,28(7):1523-1525
Conclusions Trimethylsilicon 3,5-di-tert-butyl-o-benzosemiquinolate disproportionates to the quinone and 1,2-bis-(trimethylsiloxy)-3,5-di-tert-butylbenzene.Translated from Izvestiya Akademii NaukSSSR, Seriya Khimicheskaya, No. 7, pp. 1648–1649, July, 1979. 相似文献
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M. Vuković 《Journal of Electroanalytical Chemistry》1982,133(1):25-32
An extension of double-potential-step chronocoulemetry to multiple or cyclic techniques has been developed, and its potential applications in the study of coupled chemical reactions in electrochemistry are discussed. Disproportionation and dimerization mechnisms are considered. Wroking curves have been calculated with the use of the finite difference digital simulation method. It is shown that better resolution for disproportionation and dimerization reactions can be obtained with cyclic chronocoulometry than with double-potential-step chronocoulemetry. The method has been experimentally verified measuring the disproportionation reaction U(V) in 1 mol dm?3 sodium hydrogen carbonate solutions. A rate coefficient of 15.6 dm3 mol?1 was calculated for this reaction. 相似文献
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Fabian Grote Christoph Gruber Dr. Felix Börrnert Prof. Dr. Ute Kaiser Prof. Dr. Siegfried Eigler 《Angewandte Chemie (International ed. in English)》2017,56(31):9222-9225
Graphene production by wet chemistry is an ongoing scientific challenge. Controlled oxidation of graphite introduces oxo functional groups; this material can be processed and converted back to graphene by reductive defunctionalization. Although thermal processing yields conductive carbon, a ruptured and undefined carbon lattice is produced as a consequence of CO2 formation. This thermal process is not understood, but it is believed that graphene is not accessible. Here, we thermally process oxo-functionalized graphene (oxo-G) with a low (4–6 %) and high degree of functionalization (50–60 %) and find on the basis of Raman spectroscopy and transmission electron microscopy performed at atomic resolution (HRTEM) that thermal processing leads predominantly to an intact carbon framework with a density of lattice defects as low as 0.8 %. We attribute this finding to reorganization effects of oxo groups. This finding holds out the prospect of thermal graphene formation from oxo-G derivatives. 相似文献
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Giuseppe Fachinetti Tiziana FunaioliPier Francesco Zanazzi 《Journal of organometallic chemistry》1993,460(2):C34-C36
Both [Rh4(CO)12] and [Rh6(CO)16] disproportionate in pyridine to cis-[Rh(CO)2(py)2]+ and [Rh5(CO)13(py)2]−. In the same solvent, cis-[Rh(CO)2(py)2]+ is reduced by CO/H2O to [(py)2H][Rh5(CO)13-(py)2], which has been structurally characterized. 相似文献
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Conclusions The pulse photolysis method was used to measure the rate constant for the disproportionation of cyclohexylperoxy radicals at 12–60°; the practically sole products of this reaction are cyclohexanol and cyclohexanone, which are formed in approximately equal amounts.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 631–634, March, 1979. 相似文献
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The iodous acid disproportionation is autocatalytic, and it is not easy to measure the rate constant of the step 2IO2H → IO3? + IOH + H+ separately. Hg(II) was used previously to suppress the autocatalytic pathway, but this method presents difficulties discussed in this work. A more effective method is the use of crotonic acid, an effective IOH scavenger. It suppresses side reactions, and a purely second‐order rate law is obtained. The rate constant decreases from 5 to 0.2 M?1 s?1 when the sulfuric acid concentration increases from 0.08 to 0.60 M. The observed decrease could be explained if IO2? reacts faster than IO2H. This may have consequences for the mechanism of the oscillating Bray–Liebhafsky reaction. 相似文献
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Shechkov G. T. Pevneva I. A. Meshkova O. A. 《Russian Journal of Applied Chemistry》2003,76(8):1354-1355
Thermal disproportionation of hypophosphorous acid was studied to find the reaction order, the rate constant and activation energy of the process, and also the temperature ranges in which the reaction rate is the highest. 相似文献
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J. P. Lourenço M. F. Ribeiro F. Ramôa Ribeiro J. Rocha Z. Gabelica 《Reaction Kinetics and Catalysis Letters》1996,59(2):219-225
SAPO-40 exhibits strong acid sites which catalyze the disproportionation of ethylbenzene. The distribution of diethylbenzene isomers suggests a high void volume in the structure of this molecular sieve. 相似文献
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