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1.
Exponential growth is estimated for integral operators with continuous periodic kernels of exponential type. The result is
applied to the boundary-value problem for a general hyperbolic differential equation having periodic coefficients with Goursat
boundary conditions. It is proved that the exponential characteristic for such a boundary-value problem has canonical form.
__________
Translated from Sovremennaya Matematika i Ee Prilozheniya (Contemporary Mathematics and Its Applications), Vol. 38, Suzdal
Conference-2004, Part 3, 2006. 相似文献
2.
3.
A study was carried out on the composition and nature of the stabilizing additive on the activity of nickel-containing composites
based on zirconia in the methane steam conversion. The methane conversions were 91–99% on Ni/ZrO2(Y, Sc, Ce) at 700–800 °C. 相似文献
4.
S. N. Orlik V. P. Stasevich V. L. Struzhko M. G. Martsenyuk-Kukharuk 《Theoretical and Experimental Chemistry》1996,32(4):209-212
New data are presented for the reduction of nitric oxide by C1-C4 hydrocarbons (alkanes and olefins) on active copper, cerium, and cobalt zeolite catalysts both with and without oxygen in the reaction mixture. The following hydrocarbon reactivity series were obtained. Olefins: C4H8 > C3H6 > C2H4. Alkanes: C4H10 > C3H8 > CH4.L. V. Pisarzhevskii Institute of Physical Chemistry, National Academy of Sciences of Ukraine, 31 Prospekt Nauki, 252039 Kiev, Ukraine. Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 32, No. 4, pp. 238–242, July–August, 1996. Original article submitted September 14, 1995. 相似文献
5.
Orlik S. N. Ostapyuk V. A. Alekseenko L. M. 《Theoretical and Experimental Chemistry》2002,38(3):195-198
The possibility of making products of partial oxidation, alcohols and acids in particular, by the reaction of C3-C4 alkanes with nitrogen monoxide over oxide and zeolite catalysts is demonstrated. The most effective catalysts are CeO2 and Fe-TsVK. The dependence of the rate and selectivity of the process on the reaction conditions has been established. 相似文献
6.
V. L. Struzhko S. N. Orlik M. G. Martsenyuk-Kukharuk G. M. Tel'biz V. A. Ostapyuk Yu. G. Girushlin 《Theoretical and Experimental Chemistry》1996,32(5):268-271
The acidic properties of the initial and copper-, cerium-, and cobalt-containing high-silica TsVK and TsVN zeolites of the ZSM-S type with SiO21A1203 ratios of 68 and 37, respectively, were investigated by IR spectroscopy and programmed thermal desorption of ammonia. It was shown that the introduction of copper, cerium, and cobalt cations leads to redistribution of the acid centers in the Ts VK and Ts VN zeolites according to their strength, while hardly changing their overall concentration. The strength of the Brnsted acid centers of CuTsVK, CeTsVN, and CoNTsVK zeolites correlates with their activity in the selective reduction of nitrogen oxides by hydrocarbons. 相似文献
7.
The results from investigation of the processes involved in the catalytic reduction of nitrogen oxides are reviewed: 1) with carbon monoxide and other combustible gases (H2, C
n
H
m
) at a developed block honeycomb palladium-containing catalysts; 2) with ammonia (the SCR process) at vanadium-containing and complex oxide (Cu-Cr, Fe-Cr/-Al2O3) catalysts; 3) with light C1-C4 hydrocarbons at cation-exchange zeolites (pentasils, natural and synthetic mordenites). Mechanisms and kinetic models are proposed, and the regions of a positive and negative effect from oxygen and sulfur dioxide on the processes involved in the reduction of nitrogen oxides are established. 相似文献
8.
Conditions were found for facilitation of the conversion of nitrous oxide in the presence of Fe-containing zeolite catalysts
by oxidants (NO, SO2, and O2). The results were interpreted in the framework of a mechanism involving decomposition of N2O. The effect of NOx on the reduction of nitrous oxide by C3-C4 alkanes was established.
__________
Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 42, No. 4, pp. 241–245, July–August, 2006. 相似文献
9.
10.
The effect of CeO2 on the properties of the Pd/Co3O4-CeO2/cordierite catalyst is a function of the method of its preparation. The catalyst obtained by the simultaneous deposition
of cerium oxide and cobalt oxide showed high activity in the oxidation of CO (CO + O2, CO + NO) and extensive oxidation of hexane (C6H14 + O2). This behavior is due to the increased mobility of surface oxygen and increased dispersion of the catalyst components. 相似文献