Kinetics and mechanisms of the reverse Boudouard reaction over metal carbonates in connection with the reactions of solid carbon with the metal carbonates

Nagase, Kenzo; Shimodaira, Takanao; Itoh, Masaki; Yangwen, Zheng

doi:10.1039/a906687j

Cited by 71 publications

(58 citation statements)

References 23 publications

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“…Nagase et al, [26] postulated a cyclic catalytic scheme for the CO 2 reforming of carbon. In this scheme, the reaction of carbon with Na 2 CO 3 results in the formation of oxides of sodium [Eqs.…”

Section: Influence Of Na 2 Co 3 On Gasificationmentioning

confidence: 99%

Valorization of Humin‐Based Byproducts from Biomass Processing—A Route to Sustainable Hydrogen

2013

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The synthesis of biomass-based top value-added chemical platforms, for example, 5-hydroxymethyl furfural, furfural, or levulinic acid from the acid-catalyzed dehydration of sugars results in high yields of insoluble by-products, referred to as humin. Valorization of humin by steam reforming for H2 is discussed. Both thermal and catalytic steam gasification were investigated systematically. Humin undergoes drastic changes under thermal pre-treatment to the gasification temperature. Alkali-metal-based catalysts were screened for the reactions. Na2 CO3 showed the highest activity and was selected for further study. The presence of Na2 CO3 enhances the gasification rate drastically, and gas-product analysis shows that the selectivity to CO and CO2 is 75% and 25%, respectively, which is a H2 /CO ratio of 2 (corresponding to 81.3% H2 as compared to the thermodynamic equilibrium). A possible process for the complete, efficient conversion of humin is outlined.

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Section: Influence Of Na 2 Co 3 On Gasificationmentioning

confidence: 99%

Valorization of Humin‐Based Byproducts from Biomass Processing—A Route to Sustainable Hydrogen

2013

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“…The other case is characterized by the generation of CO through an intra-molecular redox process, as has been shown in the case of alkali or alkaline earth carbonates in the literature [20]. The carbonate decomposition which leads to the CO formation given by (6) is initiated by intermolecular electron transfer from a reducing agent to CO 3 2-.…”

Section: Fuel Gasificationmentioning

confidence: 99%

Effect of Coal Gases on Electrochemical Reactions in the Direct Carbon Fuel Cell System

Eom¹,

Ahn²,

Rhie³

et al. 2015

JOCET

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Abstract-Various carbonaceous fuels were evaluated in a Direct Carbon Fuel Cell (DCFC) system as energy sources. In order to investigate the characteristics of electrochemical reaction of various fuels in DCFC, three coals, such as Shenhua coal, Adaro coal, and Openblue coal which have different content of fixed carbon and volatile matter, were selected in this research. The characteristics of electrochemical reactions of fuels were investigated at 700℃ by potentiostatic method of the fuel cell and the effect of fuels properties is also discussed. The effect of gases from coals was investigated by using raw coal state and char state in present work. The gases, such as H 2 , CH 4 , CO and CO 2 , were detected in the exhaust gas of anode side by thermal decomposition of coal. It is confirmed that these gases have an effect on the electrochemical reaction on DCFC system by comparing of current density of raw coal and char.

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“…Nagase et al [6] reported that different oxidation mechanisms act in the combination of carbon with Li 2 CO 3 and Na 2 CO 3 . Carbon with Li 2 CO 3 is oxidized by the following intermolecular redox reaction:…”

Section: Introductionmentioning

confidence: 99%

Gasification of bamboo carbon with molten alkali carbonates

Lee

Hur

2011

Korean J. Chem. Eng.

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Solid carbon can be used as a fuel in the direct carbon fuel cell (DCFC). The chemical oxidation of carbon with alkali carbonates was investigated in this work. Decreasing the weight ratio of carbon to carbonate from 5 g : 5 g to 5 g : 20 g had an insignificant effect on the amount and concentration of gases. However, changing the amounts from 5 g : 5 g to 20 g : 20 g tripled the total amount of gases produced with similar gas compositions. The gas compositions ranged from 62.2-67.5 mol% CO, 13.9-14.7 mol% H 2 , and 5.7-16.8 mol% CO 2 at 800 o C. Thus CO was the dominant gas species in the conditions. With increasing temperature, CO generation was activated, especially over 700 o C. The carbonate species did not affect carbon oxidation. Steam was supplied to the carbon and carbonate mixture at a fixed flow rate of N 2 or air. H 2 was the highest composition at both cases.

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Kinetics and mechanisms of the reverse Boudouard reaction over metal carbonates in connection with the reactions of solid carbon with the metal carbonates

Cited by 71 publications

References 23 publications

Valorization of Humin‐Based Byproducts from Biomass Processing—A Route to Sustainable Hydrogen

Valorization of Humin‐Based Byproducts from Biomass Processing—A Route to Sustainable Hydrogen

Effect of Coal Gases on Electrochemical Reactions in the Direct Carbon Fuel Cell System

Gasification of bamboo carbon with molten alkali carbonates

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