Journal of the Serbian Chemical Society | |
Non-isothermal kinetic characterisation of a gas-solid reaction by TG analysis | |
Vukelić Nikola S.1  Nedić Zoran P.1  Krstić Jugoslav2  Čupić Željko2  Jovanović Dušan2  | |
[1] Fakultet za fizičku hemiju, Beograd;Institut za hemiju, tehnologiju i metalurgiju - Centar za katalizu i hemijsko inženjerstvo, Beograd; | |
关键词: non-isothermal kinetics; thermogravimetry; non-linear regression; nickelcatalyst; catalyst preparation; | |
DOI : 10.2298/JSC0511301C | |
来源: DOAJ |
【 摘 要 】
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.
【 授权许可】
Unknown