Xyz

Specht, Dieter; Möhrle, Martin G.

doi:10.1007/978-3-322-82367-0_24

Cited by 1 publication

(4 citation statements)

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“…Equation (23) describes approximately the combustion rate of graphite within a wide pressure range, see figures 2 and 5. All curves are calculated from equation (23) for which the experimental rate constants k exp and the product k3To are taken from our measurements, from equations (3), (4) in consideration of equations (25), (26). Figure 5 shows numerous experimental results in double logarithmic presentation [11...22].…”

Section: Kinetic Considerationsmentioning

confidence: 99%

“…For the desorption the pre-exponential factor TII000 • 5.2· ro 25 in equation (4) may alternatively be determined according to the transition state theory of reaction rates [23a]. According to this theory the rate of desorption Vdes is given by:…”

Section: Kinetic Considerationsmentioning

confidence: 99%

“…From a technological viewpoint equation (34) signifies an upper limit of the reaction rate of the Boudouard reaction at about 2000 K, which is atomistically dependent and where the rate becomes independent of the partial pressure pee». According to Specht and Jeschar [25] the Boudouard reaction, under certain technological flow conditions, is also rate determining for the combustion with oxygen.…”

Section: Chemisorptionmentioning

confidence: 99%

“…The chemisorption is the rate determining step. Preceding is the adsorption equilibrium which follows from equations (25)…”

Section: K3=voexp(-airt) (31)mentioning

confidence: 99%

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On the reactions 2 C + O₂ and C + CO₂ at very low pressure

Knacke¹,

Lemperle

Seidl

2000

Steel Research

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In an ultra high vacuum heterogeneous gas reactions such as 2 C + O2G → 2 COG and C + CO2G → 2 COG often show a less complicated reaction path than under normal pressure. In the present study the graphite sample is a commercial light‐bulb filament, which is extremely resistant against oxidation. Under low pressure the combustion reaction is of first order with a continuous transition to zero order at temperatures between 900 and 1300 K depending on the oxygen pressure. The Boudouard reaction behaves similarly but obeys zero order only around 2000 K and for CO2 pressures around 1 bar. The measured and the statistically calculated reaction rates agree well. An insight of the details of the reaction and chemisorption is determined by the evaluation of experiments carried out in an ultra high vacuum using isotopes such as 13CO2G. The Boudouard equilibrium for graphite can be reached only catalytically, e.g., with sponge iron in statu nascendi.

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Section: Kinetic Considerationsmentioning

confidence: 99%

Section: Kinetic Considerationsmentioning

confidence: 99%

Section: Chemisorptionmentioning

confidence: 99%

“…The chemisorption is the rate determining step. Preceding is the adsorption equilibrium which follows from equations (25)…”

Section: K3=voexp(-airt) (31)mentioning

confidence: 99%

See 2 more Smart Citations