Non-isothermal kinetic characterisation of a gas-solid reaction by TG analysis

Journal of the Serbian Chemical Society

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