Biogas upgrade to syn-gas (H2–CO) via dry and oxidative reforming

Lau, C.S.; Tsolakis, Athanasios; Wyszyński, Miroslaw L.

doi:10.1016/j.ijhydene.2010.09.086

Cited by 156 publications

(61 citation statements)

References 28 publications

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“…According to the literature, these broad peaks can be attributed to the contribution of three different species. The peaks around 950 K are attributed to the reduction of NiO-Al species weakly interacting with the alumina support, while the reduction peaks reported at higher temperatures are related to the reduction of highly dispersed non-stoichiometric amorphous nickel aluminate spinels (at around 1050 K) and to a diluted NiAl 2 O 4 -like phase (at 1100 K) [27].…”

Section: Fresh and Reduced Catalysts Characterizationmentioning

confidence: 98%

“…Electronic controllers adjusted the fed gaseous mixture flows and a HPLC-Gilson liquid pump was used for deionized water injection (18.2 MΩ cm at 25 • C and a TOC value of 3 ppb). For all the experiments a model biogas consisting of 60 vol % CH 4 and 40 vol % CO 2 was fed [14,27,34]. A H 2 O/C molar ratio of 1.0 and O/C molar ratio of 0.25 were used in addition to nitrogen to simulate an air stream.…”

Section: Activity Measurementsmentioning

confidence: 99%

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Catalyst Deactivation and Regeneration Processes in Biogas Tri-Reforming Process. The Effect of Hydrogen Sulfide Addition

et al. 2018

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Abstract:This work studies Ni-based catalyst deactivation and regeneration processes in the presence of H 2 S under a biogas tri-reforming process for hydrogen production, which is an energy vector of great interest. 25 ppm of hydrogen sulfide were continuously added to the system in order to provoke an observable catalyst deactivation, and once fully deactivated two different regeneration processes were studied: a self-regeneration and a regeneration by low temperature oxidation. For that purpose, several Ni-based catalysts and a bimetallic Rh-Ni catalyst supported on alumina modified with CeO 2 and ZrO 2 were used as well as a commercial Katalco 57-5 for comparison purposes. Ni/Ce-Al 2 O 3 and Ni/Ce-Zr-Al 2 O 3 catalysts almost recovered their initial activity. For these catalysts, after the regeneration under oxidative conditions at low temperature, the CO 2 conversions achieved-79.5% and 86.9%, respectively-were significantly higher than the ones obtained before sulfur poisoning-66.7% and 45.2%, respectively. This effect could be attributed to the support modification with CeO 2 and the higher selectivity achieved for the Reverse Water-Gas-Shift (rWGS) reaction after catalysts deactivation. As expected, the bimetallic Rh-Ni/Ce-Al 2 O 3 catalyst showed higher resistance to deactivation and its sulfur poisoning seems to be reversible. In the case of the commercial and Ni/Zr-Al 2 O 3 catalysts, they did not recover their activity.

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Section: Fresh and Reduced Catalysts Characterizationmentioning

confidence: 98%

Section: Activity Measurementsmentioning

confidence: 99%

Catalyst Deactivation and Regeneration Processes in Biogas Tri-Reforming Process. The Effect of Hydrogen Sulfide Addition

et al. 2018

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“…The high product concentrations reachable with partial oxidation of biogas are a consequence of the ability of CO 2 to work as a reforming agent. [30,45] For steam reforming of methane and biogas the maximum value is x CO '' + x H 2 '' % 0.95 in both cases. But biogas shows the advantage that less water is needed.…”

Section: Carbon Formationmentioning

confidence: 98%

Oxidative Dry‐Reforming of Biogas: Reactor Design and SOFC System Integration

et al. 2013

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Biogas is an attractive fuel for solid oxide fuel cell applications because of the high CO2 content. Its composition allows a high electrical efficiency without adding external water to the system. Because of the CO2 reforming reaction only a very small amount of air is needed for partial oxidation, which is why the process could be called oxidative dry‐reforming. Herein, this concept is demonstrated by a thermodynamic analysis of the process and experimental system and component results. In order to realize a high yield of electrical power from the SOFC stack, a large flow of chemical energy into the stack is needed. To achieve this goal the efficiency of the reforming process is essential. With optimized reforming conditions it is possible to increase the chemical energy content of the fuel by adding an ample amount of heat to the reforming step. To achieve this in practice, the necessary heat flow to the reformer has to be calculated for a given operating temperature. Based on these thermodynamic calculations a reactor was built and tested. After successful laboratory tests the reactor was integrated into an SOFC system, where the necessary heat for the reforming step was supplied by the afterburner. The results of the component tests were verified under system conditions. Based on this system concept a high value for the electrical efficiency (ηel>0.5) of the system was achieved.

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“…Major anthropogenic sources of global carbon dioxide emissions include flue gases from coal, oilfired power stations, thermoelectric plants, FCC refining units, alcoholic fermentation, and several heavy industries, such as those that produce iron, lime, and cement. Biogas, a gaseous mixture of methane and carbon dioxide, can be directly processed by catalytic reforming (Kolbitsch et al, 2008;Lau et al, 2011). Biogas is produced from organic household waste, industrial waste, and animal dung.…”

Section: Introductionmentioning

confidence: 99%

Evaluating Hydrogen Production in Biogas Reforming in a Membrane Reactor

Silva

Benachour

Abreu

2015

Braz. J. Chem. Eng.

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-Syngas and hydrogen production by methane reforming of a biogas (CH 4 /CO 2 = 2.85) using carbon dioxide was evaluated in a fixed bed reactor with a Pd-Ag membrane in the presence of a nickel catalyst (Ni 3.31% weight)/γ-Al 2 O 3 ) at 773 K, 823 K, and 873 K and 1.01×105 Pa. Operation with hydrogen permeation at 873 K increased the methane conversion to approximately 83% and doubled the hydrogen yield relative to operation without hydrogen permeation. A mathematical model was formulated to predict the evolution of the effluent concentrations. Predictions based on the model showed similar evolutions for yields of hydrogen and carbon monoxide at temperatures below 823 K for operations with and without the hydrogen permeation. The hydrogen yield reached approximately 21% at 823 K and 47% at 873 K under hydrogen permeation conditions.

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Biogas upgrade to syn-gas (H2–CO) via dry and oxidative reforming

Cited by 156 publications

References 28 publications

Catalyst Deactivation and Regeneration Processes in Biogas Tri-Reforming Process. The Effect of Hydrogen Sulfide Addition

Catalyst Deactivation and Regeneration Processes in Biogas Tri-Reforming Process. The Effect of Hydrogen Sulfide Addition

Oxidative Dry‐Reforming of Biogas: Reactor Design and SOFC System Integration

Evaluating Hydrogen Production in Biogas Reforming in a Membrane Reactor

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