Complete reduction of carbon dioxide to carbon using cation-excess magnetite

Tamaura, Yutaka; Tahata, Masahiro

doi:10.1038/346255a0

Cited by 236 publications

(114 citation statements)

References 8 publications

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“…Another process able to produce CH 4 has been reported to be the decomposition of CO 2 to carbon and oxygen [237][238][239][240]. In this regard, ferrite catalysts have been previously used for this reaction and being non-stoichiometric or oxygen-deficient materials are able to decompose water to hydrogen and CO 2 to carbon [241][242][243][244][245].…”

Section: Nickel-iron-based Catalystsmentioning

confidence: 99%

Supported Catalysts for CO2 Methanation: A Review

et al. 2017

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CO 2 methanation is a well-known reaction that is of interest as a capture and storage (CCS) process and as a renewable energy storage system based on a power-to-gas conversion process by substitute or synthetic natural gas (SNG) production. Integrating water electrolysis and CO 2 methanation is a highly effective way to store energy produced by renewables sources. The conversion of electricity into methane takes place via two steps: hydrogen is produced by electrolysis and converted to methane by CO 2 methanation. The effectiveness and efficiency of power-to-gas plants strongly depend on the CO 2 methanation process. For this reason, research on CO 2 methanation has intensified over the last 10 years. The rise of active, selective, and stable catalysts is the core of the CO 2 methanation process. Novel, heterogeneous catalysts have been tested and tuned such that the CO 2 methanation process increases their productivity. The present work aims to give a critical overview of CO 2 methanation catalyst production and research carried out in the last 50 years. The fundamentals of reaction mechanism, catalyst deactivation, and catalyst promoters, as well as a discussion of current and future developments in CO 2 methanation, are also included.

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Section: Nickel-iron-based Catalystsmentioning

confidence: 99%

Supported Catalysts for CO2 Methanation: A Review

et al. 2017

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“…Recently, we noted that the Fe 2+ /Fe TOT ratio of a fi ne-grained (10 nm), biogenic magnetite produced by DIRB , was in excess (0.5-0.6) of stoichiometric magnetite (0.33; e.g., Greenwood and Gibb 1979) and intracellular magnetite produced by magnetotactic bacteria (Sparks et al 1990). Biogenic, intracellular magnetites are larger than those produced by DIRB (40-50 nm); they are stoichiometric and single domain in nature, and are more stable as they persist for long periods as microfossils in certain environments (Chang et al 1987;Vali et al 1987;Sparks et al 1990 /Fe TOT ratio (0.4-0.6) have been reported in the materials/catalysis research areas (e.g., McCammon et al 1986;Tamaura and Tahata 1990;Tamaura et al 1994). Cation-excess magnetites are strong reductants and promote the complete reduction of carbon dioxide to carbon (Tamura and Tahata 1990).…”

Section: Dissimilatory Fementioning

confidence: 99%

Ferrous hydroxy carbonate is a stable transformation product of biogenic magnetite

Kukkadapu

2005

American Mineralogist

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“…Tamaura and Tabata (1990) showed conversion efficiencies near 100% using cation excess magnetite (Fe 2.887 O 4 ) as a catalyst in CO 2 to form graphite at 563 K. It is should also be noted that the use of CO 2 -CO gas furnace mixtures to fix f O 2 in mineral equilibria investigations are usually restricted to temperatures above $1200 K due to problems associated with graphite precipitation (Huebner, 1975;Jurewicz et al, 1993). These studies all suggest that graphite should be one of the decomposition phases in ALH84001, if siderite was decomposed to form magnetite.…”

Section: 223mentioning

confidence: 99%

Origins of magnetite nanocrystals in Martian meteorite ALH84001

Thomas‐Keprta

Clemett

McKay

et al. 2009

Geochimica et Cosmochimica Acta

108

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The Martian meteorite ALH84001 preserves evidence of interaction with aqueous fluids while on Mars in the form of microscopic carbonate disks. These carbonate disks are believed to have precipitated 3.9 Ga ago at beginning of the Noachian epoch on Mars during which both the oldest extant Martian surfaces were formed, and perhaps the earliest global oceans. Intimately associated within and throughout these carbonate disks are nanocrystal magnetites (Fe 3 O 4 ) with unusual chemical and physical properties, whose origins have become the source of considerable debate. One group of hypotheses argues that these magnetites are the product of partial thermal decomposition of the host carbonate. Alternatively, the origins of magnetite and carbonate may be unrelated; that is, from the perspective of the carbonate the magnetite is allochthonous. For example, the magnetites might have already been present in the aqueous fluids from which the carbonates were believed to have been deposited. We have sought to resolve between these hypotheses through the detailed characterization of the compositional and structural relationships of the carbonate disks and associated magnetites with the orthopyroxene matrix in which they are embedded. Extensive use of focused ion beam milling techniques has been utilized for sample preparation. We then compared our observations with those from experimental thermal decomposition studies of sideritic carbonates under a range of plausible geological heating scenarios. We conclude that the vast majority of the nanocrystal magnetites present in the carbonate disks could not have formed by any of the currently proposed thermal decomposition scenarios. Instead, we find there is considerable evidence in support of an alternative allochthonous origin for the magnetite unrelated to any shock or thermal processing of the carbonates.

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Complete reduction of carbon dioxide to carbon using cation-excess magnetite

Cited by 236 publications

References 8 publications

Supported Catalysts for CO2 Methanation: A Review

Supported Catalysts for CO2 Methanation: A Review

Ferrous hydroxy carbonate is a stable transformation product of biogenic magnetite

Origins of magnetite nanocrystals in Martian meteorite ALH84001

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