Periodic operation of catalytic reactors—introduction and overview

Silveston, P. L.; Hudgins, R. R.; Renken, Albert

doi:10.1016/0920-5861(95)00101-k

Cited by 123 publications

(37 citation statements)

References 80 publications

(95 reference statements)

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“…Unsteady-state reactor operation was widely studied in past decades, aiming at improving the process performance by forced periodic modulation of the inlet composition, flow, pressure, or temperature [13][14][15]. The non-linearity of the reaction rates and the complexity of the reaction system are considered to be responsible for the differences between steady-state and unsteady-state operation [15].…”

Section: Introductionmentioning

confidence: 99%

Study of Unsteady‐State Operation of Methanation by Modeling and Simulation

Güttel

2013

Chem Eng & Technol

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Methanation of CO under unsteady-state operation conditions was studied systematically based on a simplified mathematical model for an integral reactor using steady-state kinetics available in the literature. The inlet composition of CO and H 2 was changed stepwise and the step response of the system was monitored in order to study the dynamic behavior of the reactor. Furthermore, periodic changes were applied with different cycling times. It was observed that the time average reaction rate could not be improved by cycling the feed composition. Moreover, the reactor appears to be self-stabilizing, since the amplitude at the outlet is reduced, leading to a steady state for high cycling frequencies. The results allow conclusions on principles to design a methanation reactor for unsteadystate operation. However, it also becomes obvious that unsteady-state kinetics is mandatory in order to describe the experimental results obtained under dynamic conditions.

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Section: Introductionmentioning

confidence: 99%

Study of Unsteady‐State Operation of Methanation by Modeling and Simulation

Güttel

2013

Chem Eng & Technol

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“…Unsteady state or periodic operation of continuously operated chemical reactors can lead to a considerable increase of selectivity and reactor performance compared to the optimal steady state (Silveston, Hudgins, & Renken, 1995). For a given reaction the obtainable performance depends strongly on the amplitude and frequency of the imposed parameter variations.…”

Section: Purpose Of Microreactormentioning

confidence: 99%

Microchannel reactors for fast periodic operation: the catalytic dehydration of isopropanol

Rougé

Spoetzl

Gebauer

et al. 2001

Chemical Engineering Science

136

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A microchannel reactor specially designed for periodic operation and a process to deposit a catalyst, -alumina, inside the reactor channels were developed. The hydrodynamics of the reactor was characterised. Although the #ow in the microchannels is laminar, a uniform radial concentration pro"le and consequently a narrow residence time distribution were obtained. Depending on the manufacturing method the Bodenstein number was found to be Bo"ud/D K 70. The catalytic coating had no in#uence on this distribution indicating a uniform deposition of the catalyst within the microchannels. As the inlet function was only slightly modi"ed in the reactors, frequencies of up to 1 Hz could be imposed for periodic operation. The dehydration of isopropanol to propene was chosen as model reaction to study the dynamic behaviour of a microreactor under periodic concentration variations. The kinetics was "rstly studied in a conventional "xed-bed reactor with the catalyst developed for the microreactor. Experimental results con"rmed the theoretically predicted increase of the reactor performance under periodic operation exceeding the maximum obtainable performance under steady-state conditions.

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“…The common objectives of the use of periodic operation in catalytic reactors are to provide an increased conversion and selectivity. There are a lot of experimental confirmations of the positive influence of periodic operation, for example hydrocarbons oxidation: ethylene, propylene, propene, cyclohexene, benzene and so on [3].…”

Section: Introductionmentioning

confidence: 96%

Mathematical modeling of toluene oxidation with a periodic reactor operation

Решетников

2009

Reac Kinet Mech Cat

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Mathematical modeling of toluene oxidation under unsteady state catalyst created by forced oscillations of concentration of toluene in the reactor inlet was carried out. It is shown that, under periodic reactor operation, the benzaldehyde yield was up to several times higher than the steady state value. This was explained by the participation of different oxygen species in the partial and total oxidation on the catalyst surface.

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Periodic operation of catalytic reactors—introduction and overview

Cited by 123 publications

References 80 publications

Study of Unsteady‐State Operation of Methanation by Modeling and Simulation

Study of Unsteady‐State Operation of Methanation by Modeling and Simulation

Microchannel reactors for fast periodic operation: the catalytic dehydration of isopropanol

Mathematical modeling of toluene oxidation with a periodic reactor operation

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