Optimization of biogas-reforming conditions considering carbon formation, hydrogen production, and energy efficiencies

Kim, Hak-Min; Gu, Yun-Jeong; Jeong, Dae-Woon

doi:10.1016/j.energy.2022.126273

Cited by 21 publications

(7 citation statements)

References 77 publications

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“…Due to the insensitivity of biogas reforming performance to pressure variations, the analysis was performed under ideal gas conditions, deliberately ignoring the effect of pressure on thermodynamic properties. 31…”

Section: Methodsmentioning

confidence: 99%

Direct biogas reforming to turquoise H₂ and carbon material in a catalytic fluidised-bed reactor

L’hospital,

de Araujo,

Schuurman

et al. 2024

New J. Chem.

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Section: Methodsmentioning

confidence: 99%

Direct biogas reforming to turquoise H₂ and carbon material in a catalytic fluidised-bed reactor

L’hospital,

de Araujo,

Schuurman

et al. 2024

New J. Chem.

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“…The feed H 2 O/(CH 4 + CO + CO 2 ) ratio was intentionally fixed at 2.0 to avoid coke formation. ,, The gas hourly space velocity (GHSV) of the gas mixture was maintained at 315,282 h –1 for catalyst screening over a range of temperatures. The gas hourly space velocity (GHSV) was calculated by eq . , GHSV .25em ( h − 1 ) = feed .25em gas .25em flow .25em rate .25em ( mL / h ) catalyst .25em bed .25em volume .25em ( mL ) …”

Section: Methodsmentioning

confidence: 99%

Restructuring Co–CoO_x Interface with Titration Rate in Co/Nb-CeO₂ Catalysts for Higher Water–Gas Shift Performance

Negi,

Kim,

Cheon

et al. 2023

ACS Appl. Mater. Interfaces

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H 2 production via water−gas shift reaction (WGS) is an important process and applied widely. Cobalt-modified CeO 2 are promising catalysts for WGS reaction. Herein, a series of Co/Nb−CeO 2 catalysts were prepared by varying the rate of precipitant addition during the coprecipitation method and examined for hydrogen generation through WGS reaction. The rates of precipitant addition were 1, 5, 15, and 25 mL/min. We obtained ceria supported cobalt catalysts with different sizes and morphology such as 3, 8 nm nanoclusters, 30 nm cubic nanoparticles, and 50 nm hexagonal nanoparticles. The well dispersed small cobalt particles in Co/Nb-CeO 2 that was prepared at 5 mL/min titration rate exhibit strong interaction between cobalt oxide and CeO 2 that retards the reduction of CoO x producing Co−CoO x pairs. In contrast, 1-Co/Nb-CeO 2 and 25-Co/Nb-CeO 2 result in bigger and aggregated Co particles, resulting in fewer interfaces with CeO 2 . The Co 0 , Co δ+ , Ce 3+ , and O v species are responsible for improved reducibility in Co/Nb−CeO 2 catalysts and were quantitively measured using XPS, XAS, and Raman spectroscopy. The Co−CoO x interface assists dissociation of the H 2 O molecule; CO oxidation requires low activation energy and realizes a high turnover frequency of 9.8 s −1 . The 5-Co/Nb-CeO 2 catalyst achieved thermodynamic equilibrium equivalent CO conversion with efficient H 2 production during WGS reaction at a gas hourly space velocity of 315,282 h −1 . Successively, the 5-Co/ Nb-CeO 2 catalyst exhibited stable performance for straight 168 h attributed to stable CO−Co δ+ intermediate formation, achieving efficient inhibition of typical CO chemistry over the Co metal, suitable for hydrogen generation from waste derived synthesis gas.

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“…Concerning steam addition, high S/C ratios (at least 1.5, achieving excess of feed vapor) are recommended to avoid coke deposition, among other factors like high pressure [100,118]. However, from an economic point of view, the production of large quantities of superheated vapor would imply a considerable increase in costs [42].…”

Section: Operating Conditionsmentioning

confidence: 99%

A Review on the Use of Catalysis for Biogas Steam Reforming

Nogales-Delgado,

Álvez-Medina,

Montes

et al. 2023

Catalysts

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Hydrogen production from natural gas or biogas, at different purity levels, has emerged as an important technology with continuous development and improvement in order to stand for sustainable and clean energy. Regarding biogas, which can be obtained from multiple sources, hydrogen production through the steam reforming of methane is one of the most important methods for its energy use. In that sense, the role of catalysts to make the process more efficient is crucial, normally contributing to a higher hydrogen yield under milder reaction conditions in the final product. The aim of this review is to cover the main points related to these catalysts, as every aspect counts and has an influence on the use of these catalysts during this specific process (from the feedstocks used for biogas production or the biodigestion process to the purification of the hydrogen produced). Thus, a thorough review of hydrogen production through biogas steam reforming was carried out, with a special emphasis on the influence of different variables on its catalytic performance. Also, the most common catalysts used in this process, as well as the main deactivation mechanisms and their possible solutions are included, supported by the most recent studies about these subjects.

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Optimization of biogas-reforming conditions considering carbon formation, hydrogen production, and energy efficiencies

Cited by 21 publications

References 77 publications

Direct biogas reforming to turquoise H₂ and carbon material in a catalytic fluidised-bed reactor

Direct biogas reforming to turquoise H₂ and carbon material in a catalytic fluidised-bed reactor

Restructuring Co–CoO_x Interface with Titration Rate in Co/Nb-CeO₂ Catalysts for Higher Water–Gas Shift Performance

A Review on the Use of Catalysis for Biogas Steam Reforming

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Optimization of biogas-reforming conditions considering carbon formation, hydrogen production, and energy efficiencies

Cited by 21 publications

References 77 publications

Direct biogas reforming to turquoise H2 and carbon material in a catalytic fluidised-bed reactor

Direct biogas reforming to turquoise H2 and carbon material in a catalytic fluidised-bed reactor

Restructuring Co–CoOx Interface with Titration Rate in Co/Nb-CeO2 Catalysts for Higher Water–Gas Shift Performance

A Review on the Use of Catalysis for Biogas Steam Reforming

Contact Info

Product

Resources

About

Direct biogas reforming to turquoise H₂ and carbon material in a catalytic fluidised-bed reactor

Direct biogas reforming to turquoise H₂ and carbon material in a catalytic fluidised-bed reactor

Restructuring Co–CoO_x Interface with Titration Rate in Co/Nb-CeO₂ Catalysts for Higher Water–Gas Shift Performance