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Titolo:
Reduction of iron oxide catalysts: The investigation of kinetic parametersusing rate perturbation and linear heating thermoanalytical techniques
Autore:
Tiernan, MJ; Barnes, PA; Parkes, GMB;
Indirizzi:
Univ Huddersfield, Ctr Appl Catalysis, Mat Res Div, Huddersfield HD1 3DH, W Yorkshire, England Univ Huddersfield Huddersfield W Yorkshire England HD1 3DH shire, England
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 1, volume: 105, anno: 2001,
pagine: 220 - 228
SICI:
1520-6106(20010111)105:1<220:ROIOCT>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
TEMPERATURE-PROGRAMMED REDUCTION; RATE THERMAL-ANALYSIS; STATE DECOMPOSITION REACTIONS; APPARENT ACTIVATION-ENERGIES; SENSITIVITY; MECHANISMS; OXIDATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Barnes, PA Univ Huddersfield, Ctr Appl Catalysis, Mat Res Div, Huddersfield HD1 3DH, W Yorkshire, England Univ Huddersfield Huddersfield W YorkshireEngland HD1 3DH and
Citazione:
M.J. Tiernan et al., "Reduction of iron oxide catalysts: The investigation of kinetic parametersusing rate perturbation and linear heating thermoanalytical techniques", J PHYS CH B, 105(1), 2001, pp. 220-228

Abstract

The mechanisms and kinetics of the reduction of powdered Fe2O3 and Fe3O4 samples have been investigated under nonisothermal conditions to provide a detailed insight into the processes occurring. Both conventional linear heating temperature-programmed reduction (TPR) and constant rate temperature-programmed reduction (CR-TPR) techniques were utilized. Fe2O3 was found to reduce to Fe in a two-step process via Fe3O4. The mechanism of the prereduction step of Fe2O3 to Fe3O4 was found to follow an nth order expression wherenucleation or diffusion was not the rate-controlling factor while the mainreduction step to metal was described by a model involving the random formation and growth of nuclei. A CR-TPR rate perturbation method, "rate-jump",was applied to the measurement of variations in apparent activation energythroughout the reduction processes, under near-equilibrium conditions and the activation energy measurements are compared with those obtained under conventional linear heating conditions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/09/20 alle ore 16:52:00