Tuning combined steam and dry reforming of methane for “metgas” production: A thermodynamic approach and state-of-the-art catalysts

Jabbour, Karam

doi:10.1016/j.jechem.2019.12.017

Cited by 66 publications

(21 citation statements)

References 141 publications

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“…Generally, DRM and CH4 disassociation thermodynamically prefers to occur at the temperature above 645 and 557°C, respectively [21,22] . Notably, the reaction (Equation 1) is favorable at the temperature below 600°C with a highly negative ∆rG, which is indicative of the spontaneous formation of Ni3ZnC0.7 from the reaction between Ni3Zn and CH4.…”

Section: Resultsmentioning

confidence: 99%

Reaction-induced Ni-based interstitial carbon atoms for coke-free dry reforming of methane

Wang¹,

Wu²,

Li³

et al. 2021

Preprint

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Dry reforming of methane on Ni-based catalyst offers an environmentally and economically viable and pivotal route to produce synthesis gas. The accumulation and polymerization of carbon atoms on the surface of Ni eventually deactivate the catalyst because of coke deposition. Here, we establish a reaction-induced method to isolate carbon atoms into the interstitial position of nickel octahedral sites (O-sites) under reaction condition, which can avoid the C−C bond formation. Al2O3 encapsulated Ni3Zn provides expanded space volume of O-sites in nickel to accommodate carbon atoms, and the further transformation to Ni3ZnC0.7 with superstructure feature was achieved under CH4/CO2 reaction. Ni3ZnC0.7/Al2O3 exhibits excellent activity and stability below 600°C with variable CH4/CO2 ratio (1/4−2/1). These active carbon atoms can be replenished and cycled in Ni3ZnC0.7 interior structure rather than depositing as coke on the surface during the reaction as revealed by in situ experiments.

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Section: Resultsmentioning

confidence: 99%

Reaction-induced Ni-based interstitial carbon atoms for coke-free dry reforming of methane

Wang¹,

Wu²,

Li³

et al. 2021

Preprint

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“…[22][23][24] The technique itself consists of three fundamental steps: syngas generation (Equation (1)), water-gas shift (WGS) reaction (Equation (2)), and hydrogen purification. [25] WGS is used to increase the hydrogen content and to convert CO into CO 2 , whereas in the final purification step, H 2 and CO 2 are separated by different methods. [26] The following reactions occur when CH 4 is used as feedstock [27,28]…”

Section: Steam Methane Reformingmentioning

confidence: 99%

Hydrogen Environmental Benefits Depend on the Way of Production: An Overview of the Main Processes Production and Challenges by 2050

Germscheidt

Moreira

Yoshimura

et al. 2021

Adv Energy and Sustain Res

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Hydrogen (H 2 ) is presented as an important alternative for clean energy and raw material in the modern world. However, the environmental benefits are linked to its process of production. Herein, the chemical aspects, advantages/disadvantages, and challenges of the main processes of H 2 production from petroleum to water are described. The fossil fuel (FF)-based methods and the state-of-art strategies are outlined to produce hydrogen from water (electrolysis), wastewater, and seawater. In addition, a discussion based on a color code to classify the cleanliness of hydrogen production is introduced. By the end, a summary of the hydrogen value chain addresses topics related to the financial aspects and perspective for 2050: green hydrogen and zero-emission carbon.

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“…This is in alignment with some prior work that has investigated the effect of cofeeding steam at much higher levels. [51] The thermodynamic analysis identifies operation at 1123 K at a feed ratio of CO 2 :CH 4 :H 2 O ¼ 1:1:0.1 at atmospheric pressure, as suitable conditions to reduce carbon formation while ensuring the conversion of water.…”

Section: Effect Of Co-feeding H 2 Omentioning

confidence: 99%

Thermodynamic Analysis of Dry Reforming of Methane for Valorization of Landfill Gas and Natural Gas

Jensen

Duyar

2021

Energy Tech

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Dry reforming of methane (DRM) is a promising technology to convert carbon dioxide (CO2) and methane (CH4), two major greenhouse gases into syngas (a mixture of carbon monoxide (CO) and hydrogen (H2)). A thermodynamic equilibrium analysis for DRM with a focus on carbon formation is carried out in Aspen Plus using the Gibbs free energy minimization method. The effects of feed CO2/CH4 ratio (0.5–3), reaction temperature (773–1373 K), and system pressure (0.1–10 atm) on the equilibrium conversion, product distribution, and solid carbon formation are investigated. From the analysis, it was found that the optimal operating conditions of 1 atm, 1123 K, and a feed ratio (CO2:CH4) of 1:1, minimized carbon formation, produced syngas at a H2/CO ratio of 1 (sufficient for downstream Fischer–Tropsch synthesis), while minimizing energy requirements. It is found that adding small amounts of oxygen or water significantly reduced carbon formation, minimized loss in syngas production, and reduced energy requirements. Three application scenarios were simulated to reflect the valorization of vented and flared natural gas and landfill gas (LFG). It was found that using captured CO2 with natural gas and LFG produced favorable results and therefore may be an opportunity for commercial DRM.

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Tuning combined steam and dry reforming of methane for “metgas” production: A thermodynamic approach and state-of-the-art catalysts

Cited by 66 publications

References 141 publications

Reaction-induced Ni-based interstitial carbon atoms for coke-free dry reforming of methane

Reaction-induced Ni-based interstitial carbon atoms for coke-free dry reforming of methane

Hydrogen Environmental Benefits Depend on the Way of Production: An Overview of the Main Processes Production and Challenges by 2050

Thermodynamic Analysis of Dry Reforming of Methane for Valorization of Landfill Gas and Natural Gas

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