On the Possibility of Increasing the Effectiveness of a Porous Catalyst Granule for a Simple Reaction in a Non-stationary Regime

Процессы Реакция-Диффузия И «мертвая Зона» В Пористой Грануле Катализатора

“…Возможность достижения большей эффективности пористых катализаторов путем размещения в центральной области гранулы непроницаемого ядра исследована в работе [4]. Другим способом повышения эффективности пористых гранул катализатора является осуществление каталитической реакции в них в искусственно создаваемом нестационарном режиме [15,16,18]. В работе [14] получены условия максимизации производительности пористой гранулы катализатора с управляемым профилем активности при осуществлении каталитического процесса в ней в искусственно создаваемом нестационарном режиме.…”

Conditions required to maximise the productivity of porous catalyst granules with a controlled activity profile

“…In the case of a uniform distribution of active centres on the internal surface of the catalyst granule the possibility of increasing the effectiveness of reaction (1) under non-steady-state conditions in comparison with steady-state ones is shown. 2,3 In this connection an analysis of the possibility of increasing the effectiveness of a porous catalyst granule is important when a catalytic reaction is realised under non-steady-state conditions on a porous catalyst with an artificially changing activity profile on its internal surface. Such management of activity profile can be achieved with the help of an electromagnetic field, for example, and also with the help of other methods which will provide the basis of a separate article.…”

Increasing the productivity of a porous catalyst granule with respect to the target compound for an arbitrary chemical reaction in a non-stationary regime

“…In a previous study 1 we have considered the problem of increasing the effectiveness of a porous catalyst granule during a simple chemical reaction occurring on the granule in a nonstationary regime.…”

“…To simplify the analysis, we assume, as in the previous study, 1 that the concentrations of the substances and the temperature in the nucleus of the reaction mixture stream vary fairly slowly with respect to the duration of the process occurring in the granule pores (the condition for the quasi-stationary state). In this case, the reaction [equation (1)] proceeding on a porous catalyst granule and the diffusion of substances in the pores may be described simultaneously 3 in terms of the stationary quasi-homogeneous model. 2 It is noteworthy that numerous experimental data 4 indicate that stationary processes occurring on porous catalyst granules can be adequately described in terms of this model.…”

“…The simple relations (10) and ( 11) are practical and apply to an arbitrary catalytic reaction (1). These relations are important when choosing an optimal catalysts for a particular reaction.…”