Mineral Matter Catalysis of Coal Conversion

Padrick, T.D.; Granoff, B.

doi:10.1021/bk-1986-0301.ch028

Cited by 4 publications

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“…Some specific metals (Ni, V, As, Cu, Mn) are known to be poisonous for the catalysts used in upgrading the coal-derived liquids. Conversely, it is reported that mineral matter and pyrites in particular can have a catalytic effect in solvent extraction of coal. − Whether the effect is really catalytic is a matter of debate. It was reported that hydrogen sulfide, − and dilution effects, could offer an alternative explanation of the observed rate enhancement in the presence of mineral matter.…”

Section: Introductionmentioning

confidence: 99%

Solvent–Coal–Mineral Interaction during Solvent Extraction of Coal

et al. 2012

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Solvent extraction of coal is a coal-to-liquids conversion process whereby the organic matter in coal is dissolved in a solvent to produce a substantially mineral matter free product. The solvent extraction of Poplar lignite coal was studied with three model solvents (tetralin, quinoline, and 1-naphtol) and one industrial coal liquid derived solvent. Of interest was the fate of hydrogen, nitrogen, sulfur, and mineral constituents during physical dissolution at 200 °C and during reactive dissolution at 400 °C. The hydrogen redistribution in all solvents at 400 °C was within a narrow range, even though hydrogen-donor solvents resulted in higher extraction yield and in a higher H/C ratio of the residue. Quinoline strongly interacted with the coal, which masked its high physical extraction yield at 200 °C and enabled more mineral matter to be stabilized in solution. This behavior is typical of nitrogen bases in the coal, but was amplified by quinoline. Nitrogen redistribution took place with all solvents to nitrogen enrich the residue. Little or no sulfur redistribution took place during solvent extraction at 200 °C with any of the solvents, but at 400 °C, sulfur was redistributed. Evidence that sulfur is removed from the mineral matter during solvent extraction was provided by an observed decrease in S/Fe ratio, decrease in sulfur content of the ash, and increase in S/C ratio of extraction residues.

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Section: Introductionmentioning

confidence: 99%

Solvent–Coal–Mineral Interaction during Solvent Extraction of Coal

et al. 2012

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“…The effect of mineral matter on coal conversion has been studied since the 1920s [1], but literature is limited with regard to aspects of pyrolysis yield and composition [2]. Since the 1980's mineral matter present in coal and the interactions occurring during pyrolysis has received a lot of attention [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

The effect of added minerals on the pyrolysis products derived from a vitrinite-rich demineralised South African coal

Roets

Bunt

Neomagus

et al. 2016

Journal of Analytical and Applied Pyrolysis

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“…The Shengli lignite is a low-rank coal with higher moisture, volatiles, and oxygen, which results in the lower ignition temperature and higher chemical reactivity because of the poor thermal stability. Therefore, it is feasible to efficiently and cleanly use Shengli lignite to produce liquid fuels, chemicals, and methane by the conversion of synthesis gas from the steam gasification. ,− Given that the ash content of Shengli lignite is 2–6 times higher than that of the lignite from outside China, such as Australia, Canada, U.S., and Germany, , which may offer distinctive characteristics in its steam gasification, we investigated the catalytic effect of inherent minerals and the mechanism during steam gasification. Therefore, in this paper, we examined the performance of steam gasification of Shengli lignite as well as the effect of inherent minerals within the lignite on the coal reaction rate, product selectivity, compositions, and H 2 /CO during the gasification.…”

Section: Introductionmentioning

confidence: 99%

Production of High H₂/CO Syngas by Steam Gasification of Shengli Lignite: Catalytic Effect of Inherent Minerals

Yang

Zhou

et al. 2015

Energy Fuels

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The steam gasification of Shengli lignite (SL-raw) and demineralized samples (SL-HCl and SL-HF) obtained by sequential leaching with hydrochloric acid and hydrofluoric acid aqueous solutions was conducted using fixed-bed microreactor equipment. The high steam gasification rate of Shengli lignite was achieved at a lower temperature range of 616−750°C compared to the demineralized lignite SL-HCl and SL-HF, indicating that the inherent minerals within Shengli lignite had a distinguished catalytic effect on the steam gasification. The initiating temperature for the steam gasification of SL-raw was 616°C, which was about 140°C lower compared to the initiating temperature of demineralized lignite samples SL-HCl and SL-HF at 756°C. On the basis of the very similar characteristics of steam gasification of SL-HCl and SL-HF, it was indeed confirmed that the principal component of inherent minerals that played a catalytic effect on the steam gasification reaction was calcium ion, which can be readily eluted by hydrochloric acid aqueous solution. The natural minerals within SL-raw not only effectively accelerated the reactivity of steam gasification but also significantly enhanced the H 2 production and substantially reduced the formation of CO, especially in the low-temperature range from 616 to 750°C. The optimal performances of steam gasification of Shengli lignite at lower temperatures were majorly attributed to the significant improvement of the water-gas shift (WGS) reaction by the inherent minerals. This study demonstrated that Shengli lignite could be a potential feedstock for the production of H 2 -rich synthesis gas by the steam gasification at the temperatures below 750°C.

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Mineral Matter Catalysis of Coal Conversion

Cited by 4 publications

References 0 publications

Solvent–Coal–Mineral Interaction during Solvent Extraction of Coal

Solvent–Coal–Mineral Interaction during Solvent Extraction of Coal

The effect of added minerals on the pyrolysis products derived from a vitrinite-rich demineralised South African coal

Production of High H₂/CO Syngas by Steam Gasification of Shengli Lignite: Catalytic Effect of Inherent Minerals

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Mineral Matter Catalysis of Coal Conversion

Cited by 4 publications

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Solvent–Coal–Mineral Interaction during Solvent Extraction of Coal

Solvent–Coal–Mineral Interaction during Solvent Extraction of Coal

The effect of added minerals on the pyrolysis products derived from a vitrinite-rich demineralised South African coal

Production of High H2/CO Syngas by Steam Gasification of Shengli Lignite: Catalytic Effect of Inherent Minerals

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Production of High H₂/CO Syngas by Steam Gasification of Shengli Lignite: Catalytic Effect of Inherent Minerals