A STUDY OF CARBON-OXYGEN SURFACE COMPLEXES USING O$sup 18$ AS A TRACER

Vastola, F.J.; Hart, P.J.; Walker, J. K.

doi:10.2172/4002667

Cited by 6 publications

(6 citation statements)

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“…The existence of sites with varying activity on a graphite surface has been documented (29,30). Additionally, it has been estimated that these sites may constitute only a small fraction of the total surface area (30)(31)(32), although the exact number is dependent on the type of graphite surface being discussed. If site I has a lower activation energy for the metal oxide reduction reaction, eq 1 will determine the rate of reaction and, consequently, the appearance temperature of the metal.…”

Section: Resultsmentioning

confidence: 99%

Alteration of metal release mechanisms in graphite furnace atomizers by chemisorbed oxygen

Holcombe¹

1982

Anal. Chem.

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Section: Resultsmentioning

confidence: 99%

Alteration of metal release mechanisms in graphite furnace atomizers by chemisorbed oxygen

Holcombe¹

1982

Anal. Chem.

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“…Many experiments have indicated that coal can be converted by the interaction of active species and energy species such as H • , H + , Ar + , and so on. [13][14][15] The CPD is limited to describing coal pyrolysis and moisture evaporation. It also found that the CPD calculation has better agreement with the experiments that had feed rates of 1.98 and 3.49 g s -1 .…”

Section: Comparison With Experiments Resultsmentioning

confidence: 99%

Simulation of Coal Pyrolysis in Plasma Jet by CPD Model

et al. 2001

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Reaction of coal in a plasma jet is complex and extremely rapid, and acetylene and carbon monoxide are the main products in the pyrolysis gas. Coal pyrolysis is assumed as the first step reaction when coal is injected into hot plasma jet with initial average temperature of 3700 K. Chemical percolation devolatilization (CPD) is employed first to simulate this procedure in mechanism. The calculation results indicate coal pyrolysis rate in plasma jet is very fast and the retention time of coal staying in reactor is only several milliseconds. Comparing the calculation with experiment result, it was concluded that the CPD agree with the experiment well when the coal feed rate is larger than about 2.0 g s -1 . As the coal feed rate was increased, the average temperature of coal particle during staying in reactor was reduced and the residual time became long, but it was not found that the residual time influenced the coal conversion evidently.

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“…The effect of various smolder enhancers or inhibitors can be considered in terms of these mechanistic aspects of char oxidation. The mechanism of catalysis of oxidation by metal salts is believed to be due to the effects of dissociation of molecular oxygen and transfer of atomic oxygen to the carbon in contact with the metal catalyst (Vastóla and Walker, 1961). Transition metals, such as the ferric salts and lead acetate, tend to decompose on pyrolysis, forming high surface area catalysts which are highly active in promoting the oxidation of the char.…”

Section: Discussionmentioning

confidence: 99%