NDLI: Non-isothermal reduction of silica-supported nickel catalyst precursors in hydrogen atmosphere: a kinetic study and statistical interpretation

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Non-isothermal reduction of silica-supported nickel catalyst precursors in hydrogen atmosphere: a kinetic study and statistical interpretation

Content Provider	Springer Nature Link
Author	Jovanović, Dušan Čupić, Željko Janković, Bojan
Copyright Year	2014
Abstract	A series of silica-supported nickel catalyst precursors was synthesized with different SiO$_{2}$/Ni mole ratios (0.20, 0.80 and 1.15). Non-isothermal reduction of Ni catalyst precursors was investigated by temperature-programmed reduction at four different heating rates (2, 5, 10 and 20 °C min$^{−1}$), in a hydrogen atmosphere. Kinetic parameters (E $_{a}$, A) were determined using Friedman isoconversional method. It was found that for all mole ratios, apparent activation energy is practically constant in conversion range of α = 30–70 %. In considered conversion range, the following values of apparent activation energy were found: E $_{a}$ = 129.5 kJ mol$^{−1}$ (SiO$_{2}$/Ni = 0.20), E $_{a}$ = 133.8 kJ mol$^{−1}$ (SiO$_{2}$/Ni = 0.80) and E $_{a}$ = 125.0 kJ mol$^{−1}$ (SiO$_{2}$/Ni = 1.15). Using two special functions (y(α) and z(α)), the kinetic model was determined. It was established that reduction of Ni catalyst precursors with different SiO$_{2}$/Ni mole ratios is a complex process and can be described by two-parameter Šesták–Berggren (SB) autocatalytic model. Based on established values of SB parameters for each mole ratio, the possible mechanism was discussed. It was found that for all investigated ratios, the Weibull distribution function fits very well the experimental data, in the wide range of conversions (α = 5–95 %). Based on obtained values of Weibull shape parameter (θ), it was found that experimentally evaluated density distribution functions of the apparent activation energies can be approximated by the unbalanced peaked normal distribution.
Starting Page	1743
Ending Page	1758
Page Count	16
File Format	PDF
ISSN	1735207X
Journal	Journal of the Iranian Chemical Society
Volume Number	11
Issue Number	6
e-ISSN	17352428
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-03-17
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	IPPC function Analytical Chemistry Temperature-programmed reduction (TPR) SiO$_{2}$/Ni catalysts Physical Chemistry Šesták–Berggren autocatalytic model Biochemistry Kinetics Inorganic Chemistry Organic Chemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry

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