Hydrodynamics and mass transfer in a tubular reactor containing foam packings for intensification of G-L-S catalytic reactions in co-current up-flow configuration

Lévêque, Julien; Philippe, Régis; Zanota, Marie-Line; Meille, Valérie; Sarrazin, Flavie; Baussaron, Loïc; Bellefon, Claude de

doi:10.1016/j.cherd.2016.03.017

Cited by 23 publications

(12 citation statements)

References 39 publications

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“…According to Equation , it was noted that the contribution of Re G is close to zero and ε has a substantial effect on the gas–liquid mass transfer of μPBRs with foam packing. Similar to other reactors with foam packing, Re L and d p / d c have a major contribution in μPBRs with foam packing.

\frac{k_{L} {ad}_{p}^{2}}{D_{{CO}_{2}}} = A {Re}_{G}^{a} {Re}_{L}^{b} {Sc}_{L}^{0.33} {(\frac{d_{normalp}}{d_{c}})}^{d}

\frac{k_{L} {ad}_{p}^{2}}{D_{{CO}_{2}}} = 152 {Re}_{G}^{0.033} {Re}_{L}^{0.79} {(\frac{d_{normalp}}{d_{c}})}^{1.13} ε^{monospace- 1.92} ((), R^{2} = 0.99)

…”

Section: Resultsmentioning

confidence: 68%

“…A correlation of k L a is also needed for μPBRs with foam packing at different operating conditions in this work. The dimensionless mass‐transfer coefficient (

k_{L} {ad}_{p}^{2} / D_{{CO}_{2}}

) was used to describe the mass transfer performance in packed bed reactors with foam packing as shown in Equation . Schmidt number was defined as relative momentum to mass diffusivities, which is held unchanged in this study.…”

Section: Resultsmentioning

confidence: 99%

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Hydrodynamics and mass transfer of gas–liquid flow in micropacked bed reactors with metal foam packing

Sang

Cheng

et al. 2019

AIChE Journal

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Hydrodynamics and mass transfer of gas-liquid flow such as pressure drop, liquid holdup, and gas-liquid mass-transfer coefficient in micropacked bed reactors (μPBRs) with metal foam packing are investigated with an automated platform. Parametric studies are conducted varying gas and liquid superficial velocities, pore diameters of foam packing, and liquid physical properties. Experimental results show that μPBRs with foam packing have comparative mass transfer rate and 10 times lower pressure drop compared to the microparticles. The values of mass-transfer coefficient for three types of foam packing in μPBRs are 1-2 orders of magnitude larger than those in large-scale trickle bed reactors with foam packing. Furthermore, empirical correlations of pressure drop, liquid holdup, and gas-liquid mass-transfer coefficient in μPBRs with foam packing are proposed and the predicted values are found to be in good agreement with the experimental values.

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\frac{k_{L} {ad}_{p}^{2}}{D_{{CO}_{2}}} = A {Re}_{G}^{a} {Re}_{L}^{b} {Sc}_{L}^{0.33} {(\frac{d_{normalp}}{d_{c}})}^{d}

\frac{k_{L} {ad}_{p}^{2}}{D_{{CO}_{2}}} = 152 {Re}_{G}^{0.033} {Re}_{L}^{0.79} {(\frac{d_{normalp}}{d_{c}})}^{1.13} ε^{monospace- 1.92} ((), R^{2} = 0.99)

…”

Section: Resultsmentioning

confidence: 68%

“…A correlation of k L a is also needed for μPBRs with foam packing at different operating conditions in this work. The dimensionless mass‐transfer coefficient (

k_{L} {ad}_{p}^{2} / D_{{CO}_{2}}

Section: Resultsmentioning

confidence: 99%

Hydrodynamics and mass transfer of gas–liquid flow in micropacked bed reactors with metal foam packing

Sang

Cheng

et al. 2019

AIChE Journal

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“…The different hydrodynamics of the APR reaction (where only liquid is fed and gas is formed) and the WGS carried out in this work (where both gas and liquid are co-fed) should be noted. In G-L-S catalytic systems, the liquid film around the catalyst particles can cause mass transfer limitations [42]. An important parameter in these kinds of systems is the liquid holdup (ε L ), which can cause the gas to bypass the catalyst for large ε L values.…”

Section: Catalytic Activitymentioning

confidence: 99%

Bimetallic Pt-Co Catalysts for the Liquid-Phase WGS

et al. 2020

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Bimetallic Pt-Co catalysts derived from cobalt aluminate spinel were investigated in the liquid-phase water–gas shift (WGS) reaction and CO hydrogenation. Liquid-phase WGS is a key reaction in the aqueous-phase reforming (APR) of polyols; thus, WGS activity is essential to formulate good APR catalysts. In this work, catalysts with different Pt/Co molar ratios were synthesized together with a reference Pt/alumina. All the synthesized catalysts were characterized by various techniques in order to gain knowledge on their structural and surface characteristics. WGS activity was tested with a feedstream of CO/H2O = 1/15 (space-time of 76.8 kgcat·s/molCO), isothermal operation at 260 °C and 50 bar, for 10 TOS. Bimetallic Pt-Co catalysts showed improved activity in liquid-phase WGS in comparison to bare Co or Pt catalysts, which was ascribed to the synergistic effect. Despite being subjected to an increased hydrogen concentration in the feedstream (H2/CO between 0 and 12/3), these catalysts maintained a preferential selectivity towards WGS activity. In addition, the effect of temperature (220–260 °C) and pressure (25–50 bar) was investigated over a catalyst with 0.3Pt/CoAl. CO conversion and CO2 yield were more sensitive to temperature, while a higher pressure favored methane production. The measured activation energy in the 220–260 °C temperature range was 51.5 kJ/mol.

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“…Since 15 years and the pionnering work of Stemmet et al [16][17][18][19], open cell solid foams (OCSFs) are studied and developed as alternative to dense packed beds. Main applications range from (reactive) distillation [20,21] to heterogeneous catalysis with gas-liquid-solid (G-L-S) reactors [22][23][24][25][26][27][28][29][30][31]. Compared to packed beds, these innovative materials offer a relatively high surface contact area combined to a very high porosity, resulting in efficient phases transport and low pressure loss.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics of gas-liquid co-current flow through a thin sheet of highly porous open cell solid foam

Busser

Serres

Philippe

et al. 2020

Chemical Engineering Science

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An experimental study of the hydrodynamics of a gas-liquid co-current flow inside a thin sheet of Open Cell Solid Foam (OCSF) confined in a plate reactor is proposed. Image processing is used to quantify the flow patterns when varying the gas and liquid flow rates and buoyancy (horizontal and vertical upflow). The fraction of joint flow and interface motion areas, respectively ε m and ε i , are defined as relevant quantities to characterize the different flow regimes and phases interaction. Two distinct regimes are observed for the vertical flow: the low (LA) and high (HA) activity regimes characterized by a low or high phases interaction. In the horizontal configuration, an additional regime is observed and is called pseudo-trickling (PT) regime due to its similarity with the trickling regime observed in vertical downflow packed beds. The transition between LA and HA regimes is compared to the regime transition in trickle beds.

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Hydrodynamics and mass transfer in a tubular reactor containing foam packings for intensification of G-L-S catalytic reactions in co-current up-flow configuration

Cited by 23 publications

References 39 publications

Hydrodynamics and mass transfer of gas–liquid flow in micropacked bed reactors with metal foam packing

Hydrodynamics and mass transfer of gas–liquid flow in micropacked bed reactors with metal foam packing

Bimetallic Pt-Co Catalysts for the Liquid-Phase WGS

Hydrodynamics of gas-liquid co-current flow through a thin sheet of highly porous open cell solid foam

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