Evaluation of kinetic parameters for the thermal decomposition of piperonaldehyde tfflosemicarbazone complexes of cobalt(II) and zinc(II) halides

The thermal decomposition of piperonaldehyde (3,4-methylenedioxybenzaldehyde) thiosemicarbazone complexes of Co(II) and Zn(II) halides has been studied thermogravimetrically in air (non-isothermal method). Reaction order n, apparent activation energy E ★, the pre-exponential factor A and entropy of...

Full description

Saved in:
Bibliographic Details
Published in:Thermochimica acta 1989-06, Vol.146, p.149-159
Main Authors: Aravindakshan, K.K., Muraleedharan, K.
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The thermal decomposition of piperonaldehyde (3,4-methylenedioxybenzaldehyde) thiosemicarbazone complexes of Co(II) and Zn(II) halides has been studied thermogravimetrically in air (non-isothermal method). Reaction order n, apparent activation energy E ★, the pre-exponential factor A and entropy of activation Δ S ★ were computed by the weighted least squares method using the Coats-Redfem and Horowitz-Metzger equations. The values of E ★, A and Δ S ★ obtained by the two different methods agree well. The mechanism for the decomposition follows the Mampel model equation, i.e. -ln(l-α) for g(α), and the rate-controlling process is random nucleation with the formation of a nucleus on every particle.
ISSN:0040-6031
1872-762X
DOI:10.1016/0040-6031(89)87085-6