Insight in kinetics from pre‐edge features using time resolved in situ XAS
作者： N.V.R.A. Dharanipragada , Vladimir V. Galvita , Hilde Poelman , Lukas C. Buelens , Guy B. Marin
DOI: 10.1002/AIC.16017
关键词: Temperature-programmed reduction 、 XANES 、 Spinel 、 Analytical chemistry 、 Chemical kinetics 、 Rietveld refinement 、 Activation energy 、 Materials science 、 Chemical reaction 、 Reaction rate
摘要: The kinetics of reduction a 10 wt %Fe2O3-MgAl2O4 spinel were investigated using XRD and time resolved Fe-K QXANES. Rietveld refinement the pattern showed replacement Al with Fe in structure formation MgFeAlOx. XANES pre-edge feature was employed to study during H2-TPR (Temperature Programmed Reduction) up 730°C. About 55% Fe3+ MgFeAlOx reduced Fe2+. A shrinking core model, which takes into account both solid-state diffusion via an oxygen coefficient, gas-solid reaction through rate applied. activation energy for chemical linear dependence on conversion, increasing from 104 126 kJ/mol over course material reduction. good accordance between model description experimental data indicates that features can be used correlate changes kinetics. © 2017 American Institute Chemical Engineers AIChE J, 64: 1339–1349, 2018
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