| Autor: |
ZELJKO CUPIC, DUSAN JOVANOVIC, JUGOSLAV KRSTIC, NIKOLA VUKELIC, ZORAN NEDIC |
| Jazyk: |
angličtina |
| Rok vydání: |
2005 |
| Předmět: |
|
| Zdroj: |
Journal of the Serbian Chemical Society, Vol 70, Iss 11, Pp 1301-1311 (2005) |
| Druh dokumentu: |
article |
| ISSN: |
0352-5139 |
| Popis: |
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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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