Catalytic steam gasification of Yallourn coal using sodium hydridotetracarbonyl ferrate

Suzuki, Toshimitsu; Mishima, Masaru; Takahashi, Toshio; Watanabe, Yoshihisa

doi:10.1016/0016-2361(85)90052-3

Cited by 14 publications

(10 citation statements)

References 12 publications

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“…Fe 2 O 3 from the oxidation of Fe 3 O 4 was observed in YL samples, but Fe 3 O 4 from the reduction of Fe 2 O 3 was observed in MD samples. According to the finding of Suzuki et al, a lower oxidation state of iron, Fe 3 O 4 instead of Fe 2 O 3 , seems to be more active in gasification of YL . Mineral transformation during pyrolysis may decrease the gasification reactivity of YL char, but increase the gasification reactivity of MD char.…”

Section: Resultsmentioning

confidence: 96%

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Mineral Transformation and Morphological Change during Pyrolysis and Gasification of Victorian Brown Coals in an Entrained Flow Reactor

Bhattacharya

2019

Energy Fuels

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Mineral transformations and morphological changes of Victorian brown coals were investigated in a two-stage process, coal pyrolysis followed by gasification of char in CO2, using an entrained flow reactor. The mineral transformations during coal pyrolysis and char gasification were examined over a wide range of temperatures between 700 and 1400 °C by X-ray diffraction and secondary scanning electron microscopy with energy-dispersive X-ray spectroscopy. In general, mineral transformations of Victorian brown coals were found to happen at high temperatures (1000–1400 °C), not at low temperatures. During coal pyrolysis, Fe2O3 from the oxidation of Fe3O4 was formed in Yallourn (YL) samples, but Fe3O4 from the reduction of Fe2O3 was formed in Maddingley (MD) samples. During char gasification, reduction of Fe2O3 by CO and decomposition of CaSO4 by CO were found in YL and MD samples. Furthermore, CaO from CaSO4 decomposition was transformed to Ca2SiO4 in YL and was transformed to CaMgSiO4 in MD samples. YL and MD also showed similar morphological changes during gasification. Mineral constituents with high Fe content were first found at 1000 °C because of reduction of Fe2O3. Melting of sulfates like MgSO4 and ablite was then found at 1200 °C. However, Loy Yang coal with a high percentage of SiO2 seemed to be thermochemically stable in terms of the behavior of mineral matters. Mineral transformations during char gasification of YL and MD tended to decrease the ash fusion temperature and slag viscosity, and enhance the gasification rate in CO2.

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Section: Resultsmentioning

confidence: 96%

“…Meanwhile, the Fe 3 O 4 formed by reduction of Fe 2 O 3 was found in the two fuels. Suzuki et al found that a lower oxidation state of iron, Fe 3 O 4 instead of Fe 2 O 3 , was more active in gasification of YL . As a result, the formation of Fe 3 O 4 during gasification may increase the gasification reactivity of char in CO 2 .…”

Section: Resultsmentioning

confidence: 99%

Mineral Transformation and Morphological Change during Pyrolysis and Gasification of Victorian Brown Coals in an Entrained Flow Reactor

Bhattacharya

2019

Energy Fuels

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“…This cooperative effect has also been observed in other systems. In steam only, CAEM studies of Pt/Ba [17] indicate that this mixture is more resistant to poisoning than the components used independently, and flow reactor studies of Fe(N03)3/Na2(C03) mixtures [18] show that this catalyst is more active than either Fe(N03h or Na2(C03) alone. In wet H2, mixtures of K 2 S0 4 and FeS04 form a molten phase at 650°C and this phase has a higher steady state activity and an improved CH4 selectivity than the components used alone [19].…”

Section: Discussionmentioning

confidence: 96%

Controlled atmosphere electron microscopy study of the gasification of graphite by water, hydrogen, and oxygen catalyzed by a nickel/potassium mixture

Carrazza

Chludzinski

Heinemann

et al. 1988

Journal of Catalysis

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“…In previous studies, K 2 CO 3 is generally regarded as a superior catalyst in terms of carbon conversion [8][9][10][11]. However, a better reactivity was observed when two metal salts were impregnated [12][13][14]. Hu et al investigated the synergistic catalysis of calcium species and K 2 CO 3 for char steam-gasification, and they reported that the calcium species/K 2 CO 3 catalyst had a better catalytic effect [15].…”

Section: Introductionmentioning

confidence: 96%

The study on the effect of the substitution of K2CO3 with Ca(OH)2 on kinetics on CO2–lignite coal gasification

2015

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Three kinds of lignite were mixed with K 2 CO 3 and Ca(OH) 2 and were gasified with CO 2 to investigate the effect that the addition of Ca(OH) 2 had on the gasification kinetics. K 2 CO 3 and Ca(OH) 2 were impregnated and dried, their mixing ratio was varied, and the gasification experiments were conducted over a temperature range from 850 to 950°C at atmospheric pressure. The modified volumetric reaction model was applied as the gas-solid reaction model to analyze the carbon conversion results and thus obtain the kinetic parameters. The results indicate that the catalytic activity based on carbon conversion followed the order of K 2 CO 3 5 wt% ? Ca(OH) 2 3 wt% [ K 2 CO 3 8 wt% [ K 2 CO 3 3 wt% ? Ca(OH) 2 5 wt% [ K 2 CO 3 1 wt% ? Ca(OH) 2 7 wt%. The reaction rate was also influenced by the type of lignite, with a higher reactivity observed for Adaro lignite. The highest reaction rate constant was of 44.25 min -1 with Adaro lignite and K 2 CO 3 5 wt% ? Ca(OH) 2 3 wt% at 950°C. The lowest activation energy of 44.49 kJ/min was calculated for Mongolia lignite with K 2 CO 3 8 wt%. The reaction rate was enhanced by partly substituting K 2 CO 3 with Ca(OH) 2 , but further substitution resulted in a decrease in the reaction rate compared to that of K 2 CO 3 alone.

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Catalytic steam gasification of Yallourn coal using sodium hydridotetracarbonyl ferrate

Cited by 14 publications

References 12 publications

Mineral Transformation and Morphological Change during Pyrolysis and Gasification of Victorian Brown Coals in an Entrained Flow Reactor

Mineral Transformation and Morphological Change during Pyrolysis and Gasification of Victorian Brown Coals in an Entrained Flow Reactor

Controlled atmosphere electron microscopy study of the gasification of graphite by water, hydrogen, and oxygen catalyzed by a nickel/potassium mixture

The study on the effect of the substitution of K2CO3 with Ca(OH)2 on kinetics on CO2–lignite coal gasification

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