Kinetic parameters obtained from TPR data for α-Fe2O3 and systems

“…The kinetic parameters were evaluated by simulation of experimental TPR spectra for the Au/Fe2O3 and Au/Co3O4 catalytic systems. It was established that in the case of the Au/Fe2O3 (for the first reduction step: hematite to magnetite) the pre-exponential factor value is substantially higher than that for pure Fe2O3 (46). In the case of Au/Co3O4, the presence of gold influenced both the activation energy and the pre-exponential factor of the reduction process (43).…”

Section: Effect Of Gold On the Reducibility Of The Metal Oxide Supportmentioning

confidence: 99%

Low temperature water gas shift over gold catalysts

2002

View full text Add to dashboard Cite

“…This indicated that the formation of metastable FeO phase was not only affected by the reduction temperature but also depended on the nature of the sample itself, which in this case the involvement of chromium element in the structure of ferric oxide enhance it reducibility . [13].…”

Section: Results and Discussion Isotherm Adsorption Of Nmentioning

confidence: 99%

Influence of Chromium on the Reduction Behavior of Ferric Oxide by Using Carbon Monoxide: Temperature Programmed Reduction and Kinetic Studies

Saharuddin

Samsuri

Salleh

et al. 2016

MJAS

View full text Add to dashboard Cite

This study was undertaken to investigate the effect of chromium on the reduction behaviour of ferric oxide with carbon monoxide (10 %, v/v) in nitrogen as a reductant. Ferric oxide was impregnated with 3 % chromium to produce chromium-doped ferric oxide (Cr-Fe 2 O 3 ). The reduction behaviour and the kinetic studies of Cr-Fe 2 O 3 and Fe 2 O 3 have been studied by temperature programmed reduction (TPR) and the phases formed of partially and completely reduced samples were characterized by X-ray diffraction spectroscopy (XRD). Meanwhile, the activation energy values were calculated from the Arrhenius equation using Wimmer's method. TPR results indicate that the reduction of Cr-Fe 2 O 3 proceeded in two reduction steps (Fe 2 O 3 → Fe 3 O 4 → Fe), while, Fe 2 O 3 proceeded in three reduction steps (Fe 2 O 3 → Fe 3 O 4 → FeO → Fe) with doped ferric oxide showed a large shifted towards lower temperature. The complete reduction of ferric oxide to metallic Fe occur at 700 °C compared to the undoped ferric oxide (900 °C). The XRD pattern showed that the diffraction peaks of Cr-Fe 2 O 3 are more intense compare to Fe 2 O 3 , indicating that the improvement on the crystallinity of the characteristic peaks of Fe 2 O 3 with no additional peak observed meaning that the chromium particles loaded on the ferric oxide were well dispersed. Furthermore, additional of 3 % chromium on ferric oxide gives larger surface area and decrease in the activation energy up to 12.39 % regarding to transition phases of Fe 2 O 3 → Fe 3 O 4 during the reduction process may also led to the increase in the rates of ferric oxide reduction.

show abstract

Kinetic parameters obtained from TPR data for α-Fe2O3 and systems

Cited by 179 publications

References 7 publications

Gold supported on iron oxy-hydroxides: a versatile tool for the synthesis of fine chemicals

Gold supported on iron oxy-hydroxides: a versatile tool for the synthesis of fine chemicals

Low temperature water gas shift over gold catalysts

Influence of Chromium on the Reduction Behavior of Ferric Oxide by Using Carbon Monoxide: Temperature Programmed Reduction and Kinetic Studies

Contact Info

Product

Resources

About