A study on the thermal decomposition of the mixtures of lanthanum oxalate hydrate and transition metal nano oxide compounds(TMNOCs) viz. CuO, Fe 2 O 3 , TiO 2 and Cr 2 O 3 of 5 mole% ratio has been carried out employing Thermogravimetry, Differential Thermal Analysis and chemical analysis. The results reveal that other than CuO the oxides have a retarding effect on the decomposition rate. There is a competition of rate between Fe 2 O 3 and TiO 2 mixture up to 696K after which the trend is reversed and Fe 2 O 3 becomes relatively more catalytic than TiO 2 . The best explanation for catalytic activities of the oxides is made by taking the former as a function of electronic configuration of the metal rather than the electronic properties of the oxides. Abnormal behaviour of Cr 2 O 3 may be attributed to an irreversible change in oxidation state of Cr 3+ during which it is oxidised to Cr 6 + prior to decomposition. The kinetic and thermodynamic parameters are evaluated in the light of F 3 mechanism in two different regions of α's and the rate follows the order: S
The data for the nonisothermal and isothermal thermal decompositions of lanthanum oxalate have been analysed using the model-free and model-fitting kinetic techniques. When applied to nonisothermal data using the Coat-Redfern(CR) equation, the widely used model-fitting approach that results excellent fitting for both isothermal and nonisothermal data but produces very ambiguous values of the Arrhenius parameters. These values cannot be compared to those obtained from isothermal experiments. On the other hand, the model-free strategy represented by the iso-conversional method, such as Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS), emphasize propertionate variation of the activation energy with the degree of conversion for both isothermal and nonisothermal experiments. The model free approach is recommended as a reliable way for obtaining consistent kinetic information from both isothermal and non-isothermal data. Despite their linear correlation, the kinetic parameters do not exhibit isokinetic behaviour. Thus, utilising Nonlinear Compensation Law, a greater association between kinetic triplets was examined.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.