Heat of immersion of Virginia-C coal in water as a function of surface oxidation

Phillips, Katherine M.; Glanville, James O.; Wightman, J. P.

doi:10.1016/0166-6622(86)80077-4

Cited by 7 publications

(2 citation statements)

References 22 publications

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“…X-ray photoelectron spectroscopy has been used to complement microcalorimetry in the study of oxidized coals. 8 The O/C ratios for the three cases of oxidized coals are shown as a function of oxidation time in Figure 5. The curve is drawn through the extracted coal points only.…”

Section: Resultsmentioning

confidence: 99%

Heats of immersion of Pocahontas No. 3 coal in n-alkanes and oxidized coal in water

Hollenhead¹,

Glanville²,

Wightman³

1988

Energy Fuels

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erais would be expected to act as catalysts in such reactions.5 Figure 3 shows the presence of 180 in molecular ions after mild oxidation while Figure 4 shows reactive oxygen species on the coal surface associated with mineral matter. These results would be expected if a free-radical mechanism is involved in low-temperature oxidation. ConclusionsDetailed SIMS images can be obtained for ions differing in mass by as little as 1:3500.The uptake of 180 and molecular ions containing 180 can be successfully studied with SIMS after exposure of coal surfaces to an 1802 atmosphere at room temperature. XPS provides additional insights when used on coal surfaces nearly identical with those studied by SIMS.The SIMS results, while not in themselves definitive, provide circumstantial evidence for a free-radical oxidation (12) Cole, D. A.; Herman, R. G.; Simmons, G. W.; Klier, K. Fuel 1985, 64, 303. mechanism in which clay minerals act as catalysts. Indeed the generation of 18OH~and the presence of 180 on the surface are indicative of low-temperature oxidation while the detection of 03", 02", 180", and 18OH" in regions rich in clay is suggestive of catalytic activity. These suggestions have been made elsewhere in the literature.* 12

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Section: Resultsmentioning

confidence: 99%

Heats of immersion of Pocahontas No. 3 coal in n-alkanes and oxidized coal in water

Hollenhead¹,

Glanville²,

Wightman³

1988

Energy Fuels

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show abstract

“…H o w e v e r , no s t u d y h a s h i t h e r t o b e e n m a d e o f h o w t h e s u r f a c e p r o p e r t i e s o f a c o a l m a y be a l t e r e d a s a r e s u l t o f t h e g r i n d i n g p r o c e s s a d o p t e d . T h e f i n d i n g s o f t h i s s t u d y c l e a r l y d e m o n s t r a t e t h a t g r i n d i n g d o e s c a u s e s t r u c t u r a l c h a n g e s o n t h e c o a l s u r f a c e , t h ( 8 ) …”

Section: M a R E D U E T O S I -0 -S I S T R E T C H I N G V I B R unclassified

Effect of Clay Content on Surface Characteristics of Coal Ground Under Different Conditions

Marabini¹,

Cozza²,

Ciriachi³

1989

Particulate Science and Technology

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Reaction of atomic species with coal—29 years later

Wightman

1991

Carbon

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Heat of immersion of Virginia-C coal in water as a function of surface oxidation

Cited by 7 publications

References 22 publications

Heats of immersion of Pocahontas No. 3 coal in n-alkanes and oxidized coal in water

Heats of immersion of Pocahontas No. 3 coal in n-alkanes and oxidized coal in water

Effect of Clay Content on Surface Characteristics of Coal Ground Under Different Conditions

Reaction of atomic species with coal—29 years later

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