A numerical optimization study on the catalytic dry reforming of methane in a spatially resolved fixed-bed reactor

Co/TiO2–MgAl2O4 was investigated in a fixed bed reactor for the dry reforming of methane (DRM) process. Co/TiO2–MgAl2O4 was prepared by modified co-precipitation, followed by the hydrothermal method. The active metal Co was loaded via the wetness impregnation method. The prepared catalyst was characterized by XRD, SEM, TGA, and FTIR. The performance of Co/TiO2–MgAl2O4 for the DRM process was investigated in a reactor with a temperature of 750 °C, a feed ratio (CO2/CH4) of 1, a catalyst loading of 0.5 g, and a feed flow rate of 20 mL min−1. The effect of support interaction with metal and the composite were studied for catalytic activity, the composite showing significantly improved results. Moreover, among the tested Co loadings, 5 wt% Co over the TiO2–MgAl2O4 composite shows the best catalytic performance. The 5%Co/TiO2–MgAl2O4 improved the CH4 and CO2 conversion by up to 70% and 80%, respectively, while the selectivity of H2 and CO improved to 43% and 46.5%, respectively. The achieved H2/CO ratio of 0.9 was due to the excess amount of CO produced because of the higher conversion rate of CO2 and the surface carbon reaction with oxygen species. Furthermore, in a time on stream (TOS) test, the catalyst exhibited 75 h of stability with significant catalytic activity. Catalyst potential lies in catalyst stability and performance results, thus encouraging the further investigation and use of the catalyst for the long-run DRM process.

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Methane Dry Reforming over Ni-Co/Al2O3: Kinetic Modelling in a Catalytic Fixed-bed Reactor

International Journal of Chemical Reactor Engineering ◽

10.1515/ijcre-2016-0170 ◽

2017 ◽

Vol 15 (6) ◽

Cited By ~ 5

Author(s):

Yacine Benguerba ◽

Mirella Virginie ◽

Christine Dumas ◽

Barbara Ernst

Keyword(s):

Catalyst Deactivation ◽

Kinetic Modelling ◽

Fixed Bed ◽

Dry Reforming ◽

Fixed Bed Reactor ◽

Coke Deposition ◽

Dry Reforming Of Methane ◽

Reactor Model ◽

Reverse Water Gas Shift ◽

Different Temperatures

Abstract The dry reforming of CH4 was investigated in a catalytic fixed-bed reactor to produce hydrogen at different temperatures over supported bimetallic Ni-Co catalyst. The reactor model for the dry reforming of methane used a set of kinetic models: The Zhang et al model for the dry reforming of methane (DRM); the Richardson-Paripatyadar model for the reverse water gas shift (RWGS); and the Snoeck et al kinetics for the coke-deposition and gasification reactions. The effect of temperatures on the performance of the reactor was studied. The amount of each species consumed or/and produced were calculated and compared with the experimental determined ones. It was showed that the set of kinetic model used in this work gave a good fit and accurately predict the experimental observed profiles from the fixed bed reactor. It was found that reaction-4 and reaction-5 could be neglected which could explain the fact that this catalyst coked rapidly comparatively with other catalyst. The use of large amount of Ni-Co will lead to carbon deposition and so to the catalyst deactivation.

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Dry Reforming of Methane at High Pressure in a Fixed-Bed Reactor with Axial Temperature Profile Determination

Catalysis Letters ◽

10.1007/s10562-018-2453-x ◽

2018 ◽

Vol 148 (8) ◽

pp. 2256-2262 ◽

Cited By ~ 6

Author(s):

Lukas Tillmann ◽

Jonas Schulwitz ◽

André van Veen ◽

Martin Muhler

Keyword(s):

High Pressure ◽

Temperature Profile ◽

Fixed Bed ◽

Dry Reforming ◽

Fixed Bed Reactor ◽

Dry Reforming Of Methane ◽

Axial Temperature

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Exploring catalyst dynamics in a fixed bed reactor by correlative operando spatially-resolved structure-activity profiling

Journal of Catalysis ◽

10.1016/j.jcat.2021.08.029 ◽

2021 ◽

Author(s):

B. Wollak ◽

D.E. Doronkin ◽

D. Espinoza ◽

T. Sheppard ◽

O. Korup ◽

...

Keyword(s):

Fixed Bed ◽

Fixed Bed Reactor ◽

Activity Profiling ◽

Spatially Resolved ◽

Structure Activity

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Effect of CO2 partial pressure on dry reforming of ethanol for hydrogen production

International Journal of Innovative Research and Scientific Studies ◽

10.53894/ijirss.v1i1.3 ◽

2018 ◽

Vol 1 (1) ◽

pp. 6-10

Author(s):

Fahim Fayaz ◽

Ahmad Ziad Sulaiman ◽

Sharanjit Singh ◽

Sweeta Akbari

Keyword(s):

Partial Pressure ◽

Fixed Bed ◽

Dry Reforming ◽

Fixed Bed Reactor ◽

Bet Surface Area ◽

Impregnation Method ◽

X Ray Diffraction ◽

Co2 Partial Pressure ◽

Temperature Programmed ◽

Al2o3 Catalyst

The effect of CO2 partial pressure on ethanol dry reforming was evaluated over 5%Ce-10%Co/Al2O3 catalyst at = PCO2 = 20-50 kPa, PC2H5OH = 20 kPa, reaction temperature of 973 K under atmospheric pressure. The catalyst was prepared by using impregnation method and tested in a fixed-bed reactor. X-ray diffraction measurements studied the formation of Co3O4, spinel CoAl2O4 and CeO2, phases on surface of 5%Ce-10%Co/Al2O3 catalyst. CeO2, CoO and Co3O4 oxides were obtained during temperature–programmed calcination. Ce-promoted 10%Co/Al2O3 catalyst possessed high BET surface area of 137.35 m2 g-1. C2H5OH and CO2 conversions was improved with increasing CO2 partial pressure from 20-50 kPa whilst the optimal selectivity of H2 and CO was achieved at 50 kPa.

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Detailed numerical simulations of catalytic fixed-bed reactors: Heterogeneous dry reforming of methane

Chemical Engineering Science ◽

10.1016/j.ces.2014.09.007 ◽

2015 ◽

Vol 122 ◽

pp. 197-209 ◽

Cited By ~ 107

Author(s):

Gregor D. Wehinger ◽

Thomas Eppinger ◽

Matthias Kraume

Keyword(s):

Numerical Simulations ◽

Fixed Bed ◽

Dry Reforming ◽

Dry Reforming Of Methane ◽

Fixed Bed Reactors

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High Active Co/Mg1-xCex3+O Catalyst: Effects of Metal-Support Promoter Interactions on CO2 Reforming of CH4 Reaction

BULLETIN OF CHEMICAL REACTION ENGINEERING AND CATALYSIS ◽

10.9767/bcrec.16.1.9969.97-110 ◽

2021 ◽

Vol 16 (1) ◽

pp. 97-110

Author(s):

Faris A. Jassim Al-Doghachi ◽

Diyar M. A. Murad ◽

Huda S. Al-Niaeem ◽

Salam H. H. Al-Jaberi ◽

Surahim Mohamad ◽

...

Keyword(s):

Photoelectron Spectroscopy ◽

Fixed Bed ◽

Fixed Bed Reactor ◽

Dry Reforming Of Methane ◽

Precipitation Method ◽

Gravimetric Analysis ◽

X Ray Diffraction ◽

X Ray ◽

Co2 Reforming Of Ch4 ◽

Temperature Programmed

Co/Mg1−XCe3+XO (x = 0, 0.03, 0.07, 0.15; 1 wt% cobalt each) catalysts for the dry reforming of methane (DRM) reaction were prepared using the co-precipitation method with K2CO3 as precipitant. Characterization of the catalysts was achieved by X-ray diffraction (XRD), X-ray fluorescence spectroscopy (XRF), X-ray photoelectron spectroscopy (XPS), temperature programmed reduction (H2-TPR), Brunauer–Emmett–Teller (BET), transmission electron microscopy (TEM), and thermal gravimetric analysis (TGA). The role of several reactant and catalyst concentrations, and reaction temperatures (700–900 °C) on the catalytic performance of the DRM reaction was measured in a tubular fixed-bed reactor under atmospheric pressure at various CH4/CO2 concentration ratios (1:1 to 2:1). Using X-ray diffraction, a surface area of 19.2 m2.g−1 was exhibited by the Co/Mg0.85Ce3+0.15O catalyst and MgO phase (average crystallite size of 61.4 nm) was detected on the surface of the catalyst. H2 temperature programmed reaction revealed a reduction of CoO particles to metallic Co0 phase. The catalytic stability of the Co/Mg0.85Ce3+0.15O catalyst was achieved for 200 h on-stream at 900 °C for the 1:1 CH4:CO2 ratio with an H2/CO ratio of 1.0 and a CH4, CO2 conversions of 75% and 86%, respectively. In the present study, the conversion of CH4 was improved (75%–84%) when conducting the experiment at a lower flow of oxygen (1.25%). Finally, the deposition of carbon on the spent catalysts was analyzed using TEM and Temperature programmed oxidation-mass spectroscopy (TPO-MS) following 200 h under an oxygen stream. Better anti-coking activity of the reduced catalyst was observed by both, TEM, and TPO-MS analysis. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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Syngas Production by Dry Methane Reforming over Mg Doped NiO-ZrO2 Catalysts

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1016.1585 ◽

2021 ◽

Vol 1016 ◽

pp. 1585-1590

Author(s):

Ye Wang ◽

Yan Nan Wang ◽

Patrick da Costa ◽

Chang Wei Hu

Keyword(s):

Carbon Tax ◽

Scale Up ◽

Fixed Bed ◽

Dry Reforming ◽

Environmental Benefits ◽

Dry Reforming Of Methane ◽

Methane Reforming ◽

Syngas Production ◽

Micro Reactor ◽

Mg Doped

In producing syngas, which offers environmental benefits, dry reforming of methane (DRM) could promote the installation of the future carbon tax. This reaction has been already extensively studied and nowadays, no stable catalysts are enough efficient to scale up the process to its industrialization. It has been suggested that basic sites can affect the performance of catalyst. It is known that magnesium promotes the performance of catalyst. In order to understand the effect of Mg for dry reforming of methane, NiO-MgO-ZrO2 catalysts were studied. The activity was carried out at 700 °C in a fixed-bed micro-reactor under CH4:CO2:Ar=1:1:8. It was shown that the introduction of Mg led to an unexpected decrease in the activity when compared to non-promoted catalyst. It was also shown that the surface area, pore-volume, pore diameter, and weak basicity decreased when the Mg was introduced into NiO-ZrO2 catalyst. All these properties can cause a decrease in the activity, selectivity, and stability of NiO-MgO-ZrO2 catalyst for DRM.

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