Fixed-bed reactors with periodic flow reversal: experimental results for catalytic combustion

Nieken, Ulrich; Kolios, Grigorios; Eigenberger, Gerhart

doi:10.1016/0920-5861(94)80130-4

Cited by 75 publications

(45 citation statements)

References 12 publications

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“…5,10,11 However, if the RFR technology is extended to real emissions, the particulated beds must be replaced by monoliths, which are the devices able to manage high flow rates with affordable pressure drops. 9,12 This work is motivated by the few experimental studies about monolithic RFR appearing in the literature: Nieken and Eigenberger 13,14 studied the combustion of propane and propylene using Pd and Pt monoliths, Ramdani et al 15 considered the combustion of xylene at low switching times and tested a control system, Litto et al 16 studied the combustion of methane, but using rings as catalyst and monoliths only as inert beds, and more recently Gosiewski et al 17 compared the performance of inert pellets and monoliths for the homogeneous (noncatalytic) combustion of methane. This work tries to fill this gap performing a detailed experimental study for methane combustion in a bench-scale RFR, where both inert and catalytic sections are filled with monolith beds.…”

Section: Introductionmentioning

confidence: 99%

Monoliths as suitable catalysts for reverse‐flow combustors: Modeling and experimental validation

Marín¹,

Ordóñez²,

Dı́ez³

2010

AIChE Journal

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The performance of a bench-scale monolithic reverse-flow reactor (RFR) for methane combustion has been experimentally studied in this work. The influence of the different operating parameters, such as total gas flow rate (2.5 Â 10(STP)), methane inlet concentration (1000-5500 ppm), and switching time (300-900 s) on the reactor performance (outlet conversion and stability), has been experimentally determined. The validation of a heterogeneous one-dimensional dynamic model for monolithic beds with the obtained experimental data allows the use of this model to simulate the behavior of industrial-scale reactors. In the second part of the work, a systematic comparison of particulate and monolithic RFRs is carried out through design curves. Reactor length for 99% outlet conversion and the corresponding pressure drop is determined for varying operating conditions (surface velocity and inlet methane concentration).

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Section: Introductionmentioning

confidence: 99%

Monoliths as suitable catalysts for reverse‐flow combustors: Modeling and experimental validation

Marín¹,

Ordóñez²,

Dı́ez³

2010

AIChE Journal

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“…methane inlet concentration (measured in terms of adiabatic temperature rise, 50-150ºC, equivalent to 1800 to 5420 ppm), switching time (50-900 s) and total gas flow rate (15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30) L/min n.t.p.). Experiments have been carried out in the adiabatic bench-scale unit described in the methodology section.…”

Section: Experimental Studymentioning

confidence: 99%

“…Reverse-flow reactors equipped with random particle beds have been the most studied [1,2,23,24], followed by honeycomb monolith bed [8,25,26], while very little attention has been paid to foam beds. The present work aims to fill this gap, by studying experimentally the performance of foam beds in reverse-flow reactors for the catalytic combustion of very lean methane/air mixtures using a Pd/ -SiC foam catalyst, prepared and tested as methane combustion catalyst in a previous work [27].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the use of ceramic foams as catalyst supports for reverse-flow combustors

Thompson

Marín

Dı́ez

et al. 2013

Chemical Engineering Journal

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“…Therefore, the required operating conditions, such as the shell CH 4 inlet fraction, the shell inlet gas flow rate etc., to establish the desired temperature profile with respect to the reverse flow behavior, were first determined by operating the reactor as a conventional reverse flow reactor for the combustion of a small amount of CH 4 in air by removing the inner tube. Because the Pt/Al 2 O 3 catalyst is already very active at low temperatures, it was found that inert sections had to be used to increase the plateau temperature (see also Nieken et al, 1994) at the membrane section of the reactor to the desired level of 900…”

Section: Reverse Flow Reactormentioning

confidence: 99%

A Reverse Flow Catalytic Membrane Reactor for the Production of Syngas: An Experimental Study

Smit

Bekink

Annaland

et al. 2005

International Journal of Chemical Reactor Engineering

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In this paper experimental results are presented for a demonstration unit of a recently proposed novel integrated reactor concept (Smit et. al., 2005) for the partial oxidation of natural gas to syngas (POM), namely a Reverse Flow Catalytic Membrane Reactor (RFCMR). Natural gas has great potential as a feedstock for the production of liquid fuels via the Gas-To-Liquid (GTL) process, but this process has not found widespread application yet, mainly due to the large costs associated with cryogenic air separation and complex heat integration. In conventional GTL processes excess O 2 (20-40 %) is used together with preheating of the feed (250-400• C). The O 2 consumption and heat integration cost can be reduced substantially by integrating the recuperative heat exchange inside the POM reactor using the reverse flow concept. The RFCMR concept basically consists of two fixed bed compartments (e.g. in a shell-and-tube configuration) separated by a porous membrane (or filter), through which the O 2 is fed distributively to the syngas compartment, thereby avoiding possibly explosive feed mixtures and hot spots. Furthermore, the flow directions of the gas streams are periodically alternated. A small amount of CH 4 is combusted in the O 2 compartment to create the trapezoidal temperature profile. Also some steam is added to the O 2 feed to keep the center of the reactor isothermal.To demonstrate the RFCMR concept an experimental set-up was constructed with a single shell-and-tube design, from which axial temperature profiles and the composition of the produced syngas could be measured. This set-up was first operated as a conventional reverse flow reactor and it was found that radial heat losses have a major influence on the axial temperature profiles as expected, but that suitable temperature profiles could be established. Subsequently, the demonstration unit was operated as a reverse flow catalytic membrane reactor. Syngas with high CO (93 %) and H 2 (96 %) selectivities with high CH 4 (85 %) conversions was produced from undiluted CH 4 feed. These selectivities are higher than the typically encountered values of 90 % in industrial practice, because of the lower O 2 /CH 4 ratio, and could be improved even further by going to higher temperatures, but this was not possible in this study due to mechanical constraints. The temperature plateau was flat in the center of the reactor and no hot spots were observed. The experiments have clearly demonstrated the potential of the RFCMR concept for energy efficient production of syngas.

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Fixed-bed reactors with periodic flow reversal: experimental results for catalytic combustion

Cited by 75 publications

References 12 publications

Monoliths as suitable catalysts for reverse‐flow combustors: Modeling and experimental validation

Monoliths as suitable catalysts for reverse‐flow combustors: Modeling and experimental validation

Evaluation of the use of ceramic foams as catalyst supports for reverse-flow combustors

A Reverse Flow Catalytic Membrane Reactor for the Production of Syngas: An Experimental Study

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