Investigation of spatially patterned catalytic reactors

Cote, Aaron; Delgass, W. Nicholas; Ramkrishna, D.

doi:10.1016/s0009-2509(98)00494-1

Cited by 24 publications

(10 citation statements)

References 3 publications

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“…Spatio-temporal temperature measurements along an optical fiber may be carried out by an Optical Backscatter Reflectometer (OBR) that launches a laser into the fiber and measures the reflective spectral scatter [4]. The method interprets the measured temperature and strain based on the change in the reflective spectral scatter (either Raman, Rayleigh or Brillouin).…”

Section: Introductionmentioning

confidence: 99%

Optical frequency domain reflectometry measurements of spatio-temporal temperature inside catalytic reactors: Applied to study wrong-way behavior

Nguyen

Harold

Luss

2013

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

Optical frequency domain reflectometry measurements of spatio-temporal temperature inside catalytic reactors: Applied to study wrong-way behavior

Nguyen

Harold

Luss

2013

Chemical Engineering Journal

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“…Cote et al 1,2 studied this strategy for spatially layered catalyst patterns from a general point of view and proposed that a reduction in performance limitations is possible with the introduction of an additional catalyst or by separating mixed catalyst beds. To overcome these restrictions, it could be beneficial to introduce an additional catalyst to facilitate an auxiliary reaction to shift the overall equilibrium toward valuable products.…”

Section: Introductionmentioning

confidence: 99%

“…Both catalysts can be arranged in a physical mixture or spatially structured, such as in layers. Cote et al 1,2 studied this strategy for spatially layered catalyst patterns from a general point of view and proposed that a reduction in performance limitations is possible with the introduction of an additional catalyst or by separating mixed catalyst beds.…”

Section: Introductionmentioning

confidence: 99%

Direct dimethyl ether synthesis by spatial patterned catalyst arrangement: A modeling and simulation study

2012

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The effect of spatially patterned catalyst beds was investigated using direct dimethyl ether (DME) synthesis from synthesis gas as an example. A layered arrangement of methanol synthesis (MS) and dehydration catalyst was chosen and studied by numerical simulation under typical operating conditions for single‐step DME synthesis. It was revealed that catalyst layers significantly influence the DME productivity. With an increasing number of layers from two to 40, an increase in DME productivity was observed approaching the performance of a physical catalyst mixture for an infinite number of layers. The results prove that a physical mixture of MS and dehydration catalyst achieves the highest DME productivity under operating conditions chosen in this study. Essentially, the layered catalyst arrangement is comparable to a cascade model of the two‐step process, which is less efficient in terms of DME yield than the single‐step process. However, the layered catalyst arrangement could be beneficial for other reaction systems. © 2012 American Institute of Chemical Engineers AIChE J, 00: 000–000, 2012

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“…Yakhnin and Menzinger (1999) extended their investigation of DIFI to situations in which catalyst deactivation occurs alongside the desired chemical reaction. A zone of high activity catalyst followed by a zone of low activity and another zone of high activity was found to accentuate DIFI or, in terms of step-change response, the amplitude of the wrong-way behaviour.Of late, there has been a growing interest in various aspects of packed-bed catalytic reactors with non-uniform activity (Clifford et al, 1998;Cote et al, 1999). In this study, we pursue the investigation of Yakhnin and Menzinger (1999) on the effect of a zone of deactivated catalyst on the amplifi cation of inlet temperature disturbances in packed catalytic beds.…”

mentioning

confidence: 99%

“…Of late, there has been a growing interest in various aspects of packed-bed catalytic reactors with non-uniform activity (Clifford et al, 1998;Cote et al, 1999). In this study, we pursue the investigation of Yakhnin and Menzinger (1999) on the effect of a zone of deactivated catalyst on the amplifi cation of inlet temperature disturbances in packed catalytic beds.…”

mentioning

confidence: 99%

Numerical Investigation of Resonance Behaviour of a Tubular Packed‐Bed Reactor with Non‐Uniform Activity

et al. 2004

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P acked-bed reactors are commonly designed for use under steadystate operation. However, there are circumstances where the reactor is subject to transient operation, e.g. upstream disturbances, periodic operation, etc. High-temperature excursions may occur when a packed-bed reactor carrying out an exothermic reaction is imposed by a sudden decrease of inlet temperature. This induces a positive concentration wave to move downstream at fl uid fl ow velocity. When the high-concentration wave reaches the reaction front, the heat of reaction produced from the local excess concentration causes the hot spot temperature to increase beyond the adiabatic temperature rise. This phenomenon has been known for many years and is referred to as wrong-way behaviour (Crider and Foss, 1966;Chen and Luss, 1989).When there are periodic disturbances, a similar phenomenon arises that Rovinsky and Menzinger (1992) refer to as differential fl ow instability (DIFI). These authors also found resonance behaviour in this situation. Hot-spot temperature at the resonance frequency is much higher than the adiabatic temperature rise. Yakhnin and Menzinger (1999) extended their investigation of DIFI to situations in which catalyst deactivation occurs alongside the desired chemical reaction. A zone of high activity catalyst followed by a zone of low activity and another zone of high activity was found to accentuate DIFI or, in terms of step-change response, the amplitude of the wrong-way behaviour.Of late, there has been a growing interest in various aspects of packed-bed catalytic reactors with non-uniform activity (Clifford et al., 1998;Cote et al., 1999). In this study, we pursue the investigation of Yakhnin and Menzinger (1999) on the effect of a zone of deactivated catalyst on the amplifi cation of inlet temperature disturbances in packed catalytic beds. The objective was to examine amplifi cation in a packed bed reactor in which the degree of segregation of the bed changes in a regular fashion. Our experimental study of segregated beds has recently appeared (Jaree et al., 2001a,b). Mathematical ModelDimensionless energy and mass balances equations describing a pseudohomogeneous, adiabatic packed-bed reactor are given by the system of partial differential equations below, assuming constant velocity and * Author to whom correspondence may be addressed. E-mail address: rhudgins@uwaterloo.ca transport properties. A standard, fi rst-order, exothermic reaction, A  B, taking place in the reactor is catalyzed by solid catalyst. FlexPDE TM (PDE Solutions Inc., Antioch, CA) was employed for integration.The effects of periodic temperature perturbations at the inlet of a packed-bed catalytic reactor were investigated for a system of non-uniform catalyst activity that could arise through catalyst deactivation. A simplifi ed model consisting of zones of active catalyst and inert packing of similar thermal properties was assumed. Simulations showed that large amplifi cation, expressed as gain, can occur. The largest gain is observed at a resonance frequen...

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Investigation of spatially patterned catalytic reactors

Cited by 24 publications

References 3 publications

Optical frequency domain reflectometry measurements of spatio-temporal temperature inside catalytic reactors: Applied to study wrong-way behavior

Optical frequency domain reflectometry measurements of spatio-temporal temperature inside catalytic reactors: Applied to study wrong-way behavior

Direct dimethyl ether synthesis by spatial patterned catalyst arrangement: A modeling and simulation study

Numerical Investigation of Resonance Behaviour of a Tubular Packed‐Bed Reactor with Non‐Uniform Activity

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