Constant rate thermal analysis of a dehydrogenation reaction. Issue 84 (26th August 2016)

• Record Type: Journal Article
• Authors: Perejón, Antonio; Pérez-Maqueda, Luis A.; Sánchez-Jiménez, Pedro E.; Criado, José M.; Murafa, Nataliya; Subrt, Jan
• Is Part Of: RSC advances. Volume 6:Issue 84(2016)
• Page Start: 81454
• Page End: 81460
• Publication Date: 2016-08-26
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra10157g
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The kinetic analysis of constant rate thermal analysis (CRTA) curves obtained for MgH2 dehydrogenation under high vacuum reveals that the reaction obeys first-order kinetics. Abstract : The Constant Rate Thermal Analysis (CRTA) procedure has been employed for the first time to study the kinetics of MgH2 dehydrogenation by thermogravimetry under high vacuum. CRTA implies controlling the temperature in such a way that the decomposition rate is maintained constant all over the process, employing the mass change as the experimental signal proportional to the reaction rate. The CRTA curves present a higher resolution power to discriminate the kinetic model obeyed by the reaction in comparison with conventional heating rate curves. The combined kinetic analysis has been applied to obtain the kinetic parameters, which show that MgH2 decomposition under high vacuum obeys first-order kinetics (F1). It has been proposed that the dehydrogenation of MgH2 under high vacuum takes place by instantaneous nucleation in the border line of the bidimensional crystallites followed by the growth of the nuclei.