Countercurrent two-phase flow fixed bed catalytic reactors

Trambouze, P.

doi:10.1016/0009-2509(90)80105-n

Cited by 33 publications

(12 citation statements)

References 4 publications

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“…The solution of theses equations was not available with conventional methods such as "shooting" method or finite differences. Instead, the "double alternate integration" method was found most reliable (Trambouze, 1990). …”

Section: Reactor Modelingmentioning

confidence: 98%

“…It is therefore necessary to proceed the HDS reaction under H 2 S concentration as low as possible, and it is needed to remove the produced H 2 S from the reacting system efficiently. In this context, a countercurrent flow reactor is the ideal choice in principle, as was presented by Trambouze in 1990. Therefore, countercurrent operation is an advanced technology in HDS, and this technology has been patented by ABB Lummus Crest Inc. (Relly and Hamilton, 1993) and in commercialization for over 20 years (Reilly et al, 1973;Jackson, 2003).…”

Section: Introductionmentioning

confidence: 97%

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Deep removal of sulfur and aromatics from diesel through two-stage concurrently and countercurrently operated fixed-bed reactors

Cheng

Fang

Zeng

et al. 2004

Chemical Engineering Science

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Section: Reactor Modelingmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 97%

Deep removal of sulfur and aromatics from diesel through two-stage concurrently and countercurrently operated fixed-bed reactors

Cheng

Fang

Zeng

et al. 2004

Chemical Engineering Science

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“…The reaction temperature was monitored with a K-type thermocouple axially located in the center of the catalyst bed. Previous catalytic experiments were performed to select the operation conditions that ensure chemical reaction control [36][37][38]. In order to satisfy these conditions, a flow of 170mLmin -1 of a CH 4 , O 2 and N 2 mixture was fed to a fixed-bed reactor containing 52mg of catalyst dissolved in 552mg of inert phase (catalyst/inert ratio=1/10).…”

Section: Methodsmentioning

confidence: 99%

Reducibility and catalytic behavior of La0.25Sr1.75MnO4 Ruddlesden-Popper phase prepared by a modified Pechini method

Supelano

Larrondo²,

Gauthier

2017

rev.ion

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Few studies have been reported concerning the use of manganite compounds (La,Sr) 2 MnO 4 of Ruddlesden-Popper structure type as Solid Oxide Fuel Cells (SOFCs) electrode materials; in particular, on the anode side. In the present work La 0.25 Sr 1.75 MnO 4 compound was synthesized by a modified Pechini method. This prepared manganite was characterized by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and its structure was analyzed into detail by refinement of recorded XRD profiles. La 0.25 Sr 1.75 MnO 4 was also subjected to a reducibility study through Temperature Programmed Reduction (TPR) and the catalytic properties for total and/or partial oxidation of methane were evaluated. Estimated values of lattice parameters in the refinement are in good agreement with those reported in the literature for various neighbored compositions of the series. The reduction of the material in diluted H 2 occurs in several stages and the decomposition starts above 800°C. In the catalytic studies, the material acts as a catalyst for total oxidation of methane even in oxygen deficient atmospheres. Keywords: SOFC, anode, manganite, XRD, TPR, catalytic oxidation. ResumenSe han reportado pocos estudios sobre el uso de compuestos de manganeso (La,Sr) 2 MnO 4 de estructura tipo Ruddlesden-Popper, como electrolitos de Celdas de Combustible de Óxido Sólido (SOFC), en particular como ánodos. En este trabajo el compuesto La 0,25 Sr 1,75 MnO 4 fue sintetizado por el método de Pechini modificado. Este material fue estudiado por la técnica de Difracción de Rayos X (XRD), Microscopía Electrónica de Barrido (SEM) y su estructura analizada en detalle mediante refinamiento de los patrones de difracción de rayos X. La 0,25 Sr 1,75 MnO 4 fue sometido a un estudio de Reducción a Temperatura Programada (TPR) y se evaluaron sus propiedades catalíticas para la oxidación total y/o parcial de metano. Los parámetros de celda estimados en el refinamiento son bastante próximos con los reportados en la literatura para series con composiciones cercanas. La reducción del material en diluido ocurre en múltiples etapas y la descomposición comienza por encima de 800°C. En los estudios catalíticos el material actúa como catalizador para la oxidación total de metano incluso en atmósferas deficientes de oxígeno.

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“…Many studies were published in the last two decades about the advantages an disadvantages of using cocurrent and counter-current cooling configurations, Soria Lopez et al (1981), de Lasa (1983, Hosten and Froment (1986) studied the fully co-current operation and Luss and Medellin (1972), Akella and Lee (1983), Guirardello (1988) and Trambouze (1990) the fully counter-current operation. Finally, McGreavy and Dunbobbin (1978), Ravella (1987) and Borio et.…”

Section: Introductionmentioning

confidence: 99%

Alternative Designs for Fixed Bed Catalytic Reactors

Morais¹,

Toledo²,

Filho³

et al. 2004

International Journal of Chemical Reactor Engineering

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The scope of this paper is to explore the benefits of both conventional operation design co-current and counter-current, to propose a new alternative design for fixed bed catalytic reactor. Steady state and dynamic behavior were considered in the analysis. Additionally for the steady state, a study on the possible alternatives for the patterns of cooling fluid was also realized, searching for an efficient refrigeration, as well as, minimum energy cost, for the fixed bed catalytic reactor. These new alternative designs consist of using the main advantages of both conventional configurations in an unique design. The results show that the proposed alternative design for fixed bed catalytic reactor has considerable advance compared to conventional system.

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Countercurrent two-phase flow fixed bed catalytic reactors

Cited by 33 publications

References 4 publications

Deep removal of sulfur and aromatics from diesel through two-stage concurrently and countercurrently operated fixed-bed reactors

Deep removal of sulfur and aromatics from diesel through two-stage concurrently and countercurrently operated fixed-bed reactors

Reducibility and catalytic behavior of La0.25Sr1.75MnO4 Ruddlesden-Popper phase prepared by a modified Pechini method

Alternative Designs for Fixed Bed Catalytic Reactors

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