Non-isothermal kinetic characterisation of a gas-solid reaction by TG analysis
Neizotermalna kinetička karakterizacija reakcija gasnih i čvrstih reaktanata TG analizom
Апстракт
A series of silica-supported Ni-catalyst precursors was synthesized, with different SiO2/Nimole ratios between 0.2 and 1.15. The reduction of all the prepared samples was studied by thermogravimetry (TG) in a hydrogen flow. The results of the TG analysis were analyzed by the multi-thermal history model-fitting method, with non-linear regression. The activation energies for the reduction of each sample were determined. The statistical F-test was performed to discriminate between various models. It was found that increasing the SiO2/Ni mole ratio leads to a change in the reaction mechanism of the nickel reduction, resulting finally in a change from second order reaction kinetics to three halves order reaction kinetics.
Niz prekursora Ni katalizatora, na silikatnom nosaču je sintetisan sa različitim SiO 2/Ni molskim odnosima, između 0,2 i 1,15. Redukcija svih pripremljenih uzoraka je proučavana termogravimetrijski (TG) u protoku vodonika. Na rezultate TG analiza je primenjena „metoda fitovanja modelima iz višestruke termalne istorije” sa nelinearnom regresijom. Energije aktivacija su određene za proces redukcije na svim uzorcima. Statistički F-test je korišćen za diskriminaciju među modelima. Nađeno je da povećanje SiO2/Ni molskog odnosa vodi promeni reakcionog mehanizma redukcije Ni, što na kraju dovodi do promene kinetike od reakcije drugog reda do reakcije reda 3/2.
Кључне речи:
non-isothermal kinetics / thermogravimetry / non-linear regression / nickelcatalyst / catalyst preparationИзвор:
Journal of the Serbian Chemical Society, 2005, 70, 11, 1301-1311Издавач:
- Serbian Chemical Society
DOI: 10.2298/JSC0511301C
ISSN: 0352-5139
WoS: 000234277000008
Scopus: 2-s2.0-31544465743
Институција/група
IHTMTY - JOUR AU - Čupić, Željko AU - Jovanović, Dušan M. AU - Krstić, Jugoslav AU - Vukelić, Nikola AU - Nedić, Zoran PY - 2005 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/168 AB - A series of silica-supported Ni-catalyst precursors was synthesized, with different SiO2/Nimole ratios between 0.2 and 1.15. The reduction of all the prepared samples was studied by thermogravimetry (TG) in a hydrogen flow. The results of the TG analysis were analyzed by the multi-thermal history model-fitting method, with non-linear regression. The activation energies for the reduction of each sample were determined. The statistical F-test was performed to discriminate between various models. It was found that increasing the SiO2/Ni mole ratio leads to a change in the reaction mechanism of the nickel reduction, resulting finally in a change from second order reaction kinetics to three halves order reaction kinetics. AB - Niz prekursora Ni katalizatora, na silikatnom nosaču je sintetisan sa različitim SiO 2/Ni molskim odnosima, između 0,2 i 1,15. Redukcija svih pripremljenih uzoraka je proučavana termogravimetrijski (TG) u protoku vodonika. Na rezultate TG analiza je primenjena „metoda fitovanja modelima iz višestruke termalne istorije” sa nelinearnom regresijom. Energije aktivacija su određene za proces redukcije na svim uzorcima. Statistički F-test je korišćen za diskriminaciju među modelima. Nađeno je da povećanje SiO2/Ni molskog odnosa vodi promeni reakcionog mehanizma redukcije Ni, što na kraju dovodi do promene kinetike od reakcije drugog reda do reakcije reda 3/2. PB - Serbian Chemical Society T2 - Journal of the Serbian Chemical Society T1 - Non-isothermal kinetic characterisation of a gas-solid reaction by TG analysis T1 - Neizotermalna kinetička karakterizacija reakcija gasnih i čvrstih reaktanata TG analizom VL - 70 IS - 11 SP - 1301 EP - 1311 DO - 10.2298/JSC0511301C ER -
@article{ author = "Čupić, Željko and Jovanović, Dušan M. and Krstić, Jugoslav and Vukelić, Nikola and Nedić, Zoran", year = "2005", abstract = "A series of silica-supported Ni-catalyst precursors was synthesized, with different SiO2/Nimole ratios between 0.2 and 1.15. The reduction of all the prepared samples was studied by thermogravimetry (TG) in a hydrogen flow. The results of the TG analysis were analyzed by the multi-thermal history model-fitting method, with non-linear regression. The activation energies for the reduction of each sample were determined. The statistical F-test was performed to discriminate between various models. It was found that increasing the SiO2/Ni mole ratio leads to a change in the reaction mechanism of the nickel reduction, resulting finally in a change from second order reaction kinetics to three halves order reaction kinetics., Niz prekursora Ni katalizatora, na silikatnom nosaču je sintetisan sa različitim SiO 2/Ni molskim odnosima, između 0,2 i 1,15. Redukcija svih pripremljenih uzoraka je proučavana termogravimetrijski (TG) u protoku vodonika. Na rezultate TG analiza je primenjena „metoda fitovanja modelima iz višestruke termalne istorije” sa nelinearnom regresijom. Energije aktivacija su određene za proces redukcije na svim uzorcima. Statistički F-test je korišćen za diskriminaciju među modelima. Nađeno je da povećanje SiO2/Ni molskog odnosa vodi promeni reakcionog mehanizma redukcije Ni, što na kraju dovodi do promene kinetike od reakcije drugog reda do reakcije reda 3/2.", publisher = "Serbian Chemical Society", journal = "Journal of the Serbian Chemical Society", title = "Non-isothermal kinetic characterisation of a gas-solid reaction by TG analysis, Neizotermalna kinetička karakterizacija reakcija gasnih i čvrstih reaktanata TG analizom", volume = "70", number = "11", pages = "1301-1311", doi = "10.2298/JSC0511301C" }
Čupić, Ž., Jovanović, D. M., Krstić, J., Vukelić, N.,& Nedić, Z.. (2005). Non-isothermal kinetic characterisation of a gas-solid reaction by TG analysis. in Journal of the Serbian Chemical Society Serbian Chemical Society., 70(11), 1301-1311. https://doi.org/10.2298/JSC0511301C
Čupić Ž, Jovanović DM, Krstić J, Vukelić N, Nedić Z. Non-isothermal kinetic characterisation of a gas-solid reaction by TG analysis. in Journal of the Serbian Chemical Society. 2005;70(11):1301-1311. doi:10.2298/JSC0511301C .
Čupić, Željko, Jovanović, Dušan M., Krstić, Jugoslav, Vukelić, Nikola, Nedić, Zoran, "Non-isothermal kinetic characterisation of a gas-solid reaction by TG analysis" in Journal of the Serbian Chemical Society, 70, no. 11 (2005):1301-1311, https://doi.org/10.2298/JSC0511301C . .