Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 1573-935X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Conclusions We shall discuss what differences the “complexity” (n-stage character) brings into the kinetic characteristics of the “simplest” case examined by us: an unbranched cycle, linear with respect to the intermediate substances. In the range in which the reaction proceeds in the forward direction the temperature dependence for an exothermal complex reaction is identical to that for a simple reversible exothermal stage [1]. For a complex endothermal reaction are possible characteristics which are analogous to an elementary endothermal stage: a monotonic dependence, but also a novel property may appear: an extreme (no more than one) due to the strong hidden endothermal character. As was proved in the present study, the action of the partial pressures of the reactants is analogous to their effect on the rate of an elementary reaction: monotonic functions. The difference consists in that here in most cases a limiting rate exists as a result of, for example, the circumstance that the detailed mechanism embraces stages in which no gas phase participates. Consequently, we classified the typical stationary kinetic characteristics of an n-stage unbranched catalytic reaction with a mechanism linear with respect to the intermediate products. The results obtained in our study can be easily extended to other cases, too, when the kinetic equations are of the shape (1), for example, to some empirical equations.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1573-935X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1573-935X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Построена математическая модель, описывающая автоколебательный режим холоднопламенного горения смеси н-гептан-изооктан. Характер зависимостей амплитуды и периода колебаний от температуры и состава смеси качественно совпадает с аналогичными экспериментальными данными.
    Notes: Abstract A mathematical model has been constructed to describe the self-oscillation regime of the cool-flame combustion of an n-heptane-isooctane mixture. The character of the dependence of the amplitude and oscillation period on the temperature and mixture composition is in a qualitative agreement with the similar experimental data.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract На основе полинома, к которому сводится система уравнений квазистационарности, соответствующая нелинейному одномаршрутному механизму (кинетического полинома) проводится исследование известных понятий —стехиометрического числа и молекулярности. Показано, что набор минимально-целочисленных стехиометрических коэффициентов соответствует кинетическим характеристикам вблизи равновесия.
    Notes: Abstract On the basis of the polynomial to which the system of pseudo-steady-state equations corresponding to the nonlinear single-route mechanism is reduced (kinetic polynomial), the known concepts of “stoichiometric number” and “molecularity” have been studied. A set of the minimal-integer stoichiometric coefficients is shown to correspond to the kinetic characteristics in the neighborhood of equilibrium.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Описана математическая модель процесса переработкя в псевдоожиженном слое каталинзатора. Рассматривается трехфазная система: катализатор, газ, уголь. Обсуждаются граничные условия для реактора, работающего в импульсном режиме.
    Notes: Abstract A mathematical model for the thermal oxidation of coal in a pseudo-fluidized catalyst bed is suggested. A three-phase system: catalyst, gas and coal, is considered. The boundary conditions for the pulse operation of the reactor are discussed.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Показано, что при многокомпонентной абсорбции с химическими реакциями первого и нулевого порядков, протекающей без торможения массопереноса в газовой фазе, локально осредненные диффузионные потоки через единицу поверхности раздела фаз являются линейными функциями локально осредненных концентраций. Такое соотношение может быть использовано при построении иерархических моделей газо-жидкостных реакторов.
    Notes: Abstract It has been shown that in multicomponent absorption with first and zero order chemical reactions proceeding without resistance to mass transfer in the gas phase, the locally averaged diffusive fluxes through unit interfacial area are linear functions of locally averaged concentrations. This relation can be used for the development of hierarchic models of gas-liquid reactors.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Проведен параметрический анализ собственных значений матриц, возникающих в химической кинетике и отвечающих линейным n-стадийным одномаршрутным механизмам с необратимыми стадиями. Даны оценки времен релаксации при варьировании одной иэ констант скорости стадии. Показана возможность немонотонного изменения времени релаксации при росте констант скорости.
    Notes: Abstract The parametric analysis of accepted eigenvalues of matrices observed in chemical kinetics and corresponding to the linear n-stage one-route mechanisms with irreversible stages has been conducted. Relaxation times with varying one of the rate constants are given. The possibility of nonmonotonic change of relaxation times with growing rate constants is shown.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 9
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Получены условия существования нескольких стационарных состояний поверхности для простейшего механизма без предположения об автокатализе и воздействия реакционной среды на катализатор. Показана возможность объяснения множественности стационарных состояний, найденных экспериментально в кинетической области, в рамках механизмов, включающих стадии взаимодействий между различными промежуточными вешествами.
    Notes: Abstract The conditions for the existence of several steady states of the surface have been found for the simplest mechanism without the assumption of autocatalysis and without the effect of the medium on the catalyst. A possibility has been shown for the explanation of the multiplicity of steady states, found experimentally in the kinetic region, in terms of mechanisms including interactions between various intermediates.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 10
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Для простейшего каталитического механизма (трехстадийного), допускающего несколько стационарных состояний поверхности, проведен качественный анализ свойств траекторий его кинетической модели. Определены типы стационарных состояний. Показано отсутствие осцилляций (затухающих и незатухающих).
    Notes: Abstract For the simplest catalytic mechanism (three-stage) permitting several steady states of the surface, a qualitative analysis of the properties of its kinetic model trajectories has been performed. Types of the steady states have been determined. Absence of oscillations (damped and undamped) has been shown.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...