A mass spectrometric study of the carbon-oxygen reaction—27 years later

Laine, N.R.

doi:10.1016/0008-6223(91)90009-8

Cited by 7 publications

(4 citation statements)

References 12 publications

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“…The formation of oxygen surface complexes has long been recognized as an important reaction step in the combustion of carbonaceous materials, as well as in their reaction with other gasifying agents such as CO 2 and H 2 O. − These surface species are also of great importance in determining the interfacial phenomena in carbon fiber-reinforced composite materials, , as well as the surface properties and, hence, applications of active carbons. − …”

Section: Introductionmentioning

confidence: 99%

Temperature-Programmed Desorption of Oxygen Surface Complexes on Acenaphthylene-Derived Chars: Comparison with Oxygen K-Edge XANES Spectroscopy

Turner

Thomas

1999

Langmuir

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The interpretation of temperature-programmed desorption (TPD) data relating to the decomposition of oxygen surface complexes on carbonaceous materials is complex. Oxygen K-edge XANES spectroscopy was used to characterize a series of acenaphthylene-derived chars oxidized by either partial combustion or low-temperature oxygen chemisorption prior to their study by TPD. Evidence for the presence of mobile hydrogen species was provided by the observation that H2 and H2O were evolved at high temperatures during TPD. A constant CO:CO2 ratio for the desorption products evolved during the TPD of the partially combusted chars at desorption temperatures below ∼1000 K was attributed to surface reactions of mobile oxygen surface species controlling the product ratio. This indicates that desorption product ratios may be an unreliable guide to the functional groups undergoing decomposition, especially for chars with high hydrogen contents. Above ∼1000 K, the CO:CO2 ratio was observed to increase sharply. This was attributed to scavenging of C(O) by mobile hydrogen species, although the possibility that different functional groups might have different mobilities was also considered. The TPD profiles of the surface oxygen complexes formed during oxygen chemisorption at 473 K contained additional peaks not present in the profiles of the samples combusted at 773 K. These additional peaks were attributed to the formation of a wider range of acid-like surface complexes during low-temperature oxygen chemisorption than during combustion. This suggests that care must be taken when applying low-temperature chemisorption data to combustion scenarios.

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Section: Introductionmentioning

confidence: 99%

Temperature-Programmed Desorption of Oxygen Surface Complexes on Acenaphthylene-Derived Chars: Comparison with Oxygen K-Edge XANES Spectroscopy

Turner

Thomas

1999

Langmuir

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“…Researchers have studied the carbon and oxygen reaction in detail for well over a century with several major contributions made over the past 50 years 13,14,15,16,17,18,19,20 . The primary thermodynamic carbonoxygen reactions, as presented in Equations 2 through 8, are well established and reasonably well understood.…”

Section: Graphite-oxygen Reaction Kineticsmentioning

confidence: 99%

Role of nuclear grade graphite in controlling oxidation in modular HTGRs

Windes¹,

Strydom²,

Kane³

et al. 2014

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“…An accurate modeling of the processes taking place in pellets becomes very important, as this model can be used to study, predict, and control the reactors. Laine reports “...we cannot ignore the results of laboratory-scale, atomistic chemical studies in well-ordered systems. If we do, the industrial-scale results are doomed to be disappointing, inconsistent, and subject to the black magic of running to process specifications in hopes of attaining product specifications, whether that product is alumina powder or unit of energy.” We would like to add that numerical modeling is also an integral part of understanding the intricate relations between various phenomena and an extremely powerful tool in simulation using physical processes taking place in small-scale to large-scale industrial operations.…”

Section: Introductionmentioning

confidence: 99%

Pellet Breakup Due to Pressure Generated during Wood Pyrolysis

Hastaog̃lu

Kahraman

Syed

2000

Ind. Eng. Chem. Res.

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A transient unimodel for reacting pellets is considered with various modes of heat and mass transfer and structural changes for wood pyrolysis. Pellet breakup was found to be possible from strength calculations. This leads to an increase in the number of pellets and a decrease in the resistance to heat and mass transfer. The pressure and temperature buildup within 2.7 mm thick pellets was measured for wood pyrolysis/combustion experimentally. The bimodal wood pyrolysis was analyzed, and the rate constant and activation energy were found. Pellet breakup may also be used as a transient catalytic process where the catalysts become smaller as they break up in time.

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A mass spectrometric study of the carbon-oxygen reaction—27 years later

Cited by 7 publications

References 12 publications

Temperature-Programmed Desorption of Oxygen Surface Complexes on Acenaphthylene-Derived Chars: Comparison with Oxygen K-Edge XANES Spectroscopy

Temperature-Programmed Desorption of Oxygen Surface Complexes on Acenaphthylene-Derived Chars: Comparison with Oxygen K-Edge XANES Spectroscopy

Role of nuclear grade graphite in controlling oxidation in modular HTGRs

Pellet Breakup Due to Pressure Generated during Wood Pyrolysis

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