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Cited by 165 publications
(45 citation statements)
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“…Furthermore, they have the advantage that they are not volatile at all after degassing. Weisz and Goodwin [10] found the same activation energies for the buming of different types of coke, thus measurements with carbon black or graphite should be suitable to reproduce the earlier results and should demonstrate oxygen spillover.…”
Section: Introductionmentioning
confidence: 69%
“…Furthermore, they have the advantage that they are not volatile at all after degassing. Weisz and Goodwin [10] found the same activation energies for the buming of different types of coke, thus measurements with carbon black or graphite should be suitable to reproduce the earlier results and should demonstrate oxygen spillover.…”
Section: Introductionmentioning
confidence: 69%
“…As already outlined by Weisz and Goodwin [5,6], pore diffusion strongly influences the Nomenclature A m external surface area (m 2 /kg) A pore internal BET-surface area (m 2 /kg) B C carbon load of catalyst, ratio of carbon mass to mass of fresh catalyst (kg C /kg cat ) C O 2 concentration of oxygen (mol/m 3 ) d diameter (m) D diffusion coefficient (m 2 /s) E A activation energy (J/mol) EDX energy dispersive X-ray spectrometer F hindered diffusion factor F (dimensionless) IR infrared (analyser) k m reaction rate constant of carbon combustion (m 3 /(kg s)) k m,0 pre-exponential factor of k m (m 3 /(kg s)) L length of a cylindrical particle (m) M molecular weight (kg/mol) N reaction order (dimensionless) NMR nuclear magnetic resonance NTP normal temperature and pressure (0 • C, 1.013 bar) p pressure (Pa) PFG pulse field gradient r m reaction rate per unit of mass of (coke-free) catalyst (mol/(kg s)) r radial coordinate within the particle (m) r 0 radius of particle (m) R ideal gas law constant (8.314 J/(mol K)) Re p particle Reynolds number, d p u e /(ε b ν) (dimensionless) SEM scanning electron microscopy Sc Schmidt number, ν/D mol (dimensionless) Sh…”
Section: Introductionmentioning
confidence: 85%
“…(4) Based on the data of the chemical kinetics, mass transfer and the changing particle morphology, the regeneration process within coked particles was simulated numerically. (5) The experimental data-coke profiles and time needed to reach a certain stage of regeneration-were then finally compared with the results of the numerical simulations.…”
Section: Introductionmentioning
confidence: 99%
“…Some studies report burning rates as determined from fixed beds (Dart et al, 1949;Gonzales and Spencer, 1963;Hano et al, 1975) and fluidized beds (Johnson and Mayland, 1955). Others report burning rates from individual catalyst pellets (Weisz and Goodwin, 1963;1966;Massoth, 1967). The regeneration of hydrotreating catalysts has been the topic of recent studies (Ellingham and Garrett, 1984;Nalitham et al, 1985;Bogdnor and Rase, 1986;Yoshimura and Furimsky, 1986).…”
Section: Introductionmentioning
confidence: 92%