Fast synthesis of Mo[O.sub.3-x] and its catalytic effect on the thermal decomposition of ammonium perchlorate based molecular perovskite (DAP-4).

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Date: Oct. 2021
From: Canadian Journal of Chemistry(Vol. 99, Issue 10)
Publisher: NRC Research Press
Document Type: Report
Length: 3,283 words
Lexile Measure: 1840L

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Abstract :

In this work, it is shown that Mo[O.sub.3-x] has a positive effect on the thermal decomposition of ammonium perchlorate based molecular perovskite [([H.sub.2]DABCO)[[NH.sub.4]([ClO.sub.4]).sub.3]] (DAP-4). Mo[O.sub.3-x] was prepared by heat treatment, and the morphology, structure, and thermal decomposition performance were characterized. The morphology and structure characterization results showed that Mo[O.sub.3-x] was an irregular layered structure material and the Mo element was mainly in the +6 chemical valence state, with a small amount of [Mo.sup.5+]. Thermal analysis results showed that the thermal decomposition peak temperature of DAP-4 was effectively reduced from 394.4 [degrees]C to 353.7 [degrees]C, 321.4 [degrees]C, and 312.5 [degrees]C in the presence of 1%, 5%, and 10% Mo[O.sub.3-x], respectively. It is particularly worth noting that the maximum heat release rate of the DAP-4/10% Mo[O.sub.3-x] mixture was increased by 4.9 times compared with pure DAP-4. Through the two classic thermal decomposition kinetic methods, Kissinger and Starink, the reliable kinetic parameters of DAP-4/Mo[O.sub.3-x] were obtained. The increase of the reaction rate constant k indicated that the maximum thermal decomposition reaction rate of DAP-4 was effectively improved. This work provided a feasible technology for using [MoO.sub.3-x] as an effective catalyst to improve the thermal performance of DAP-4. Key words: Mo[O.sub.3-x], molecular perovskite, [([H.sub.2]DABCO)[[NH.sub.4]([ClO.sub.4]).sub.3]] DAP-4, catalysis, thermal decomposition. Dans le cadre des presents travaux, nous avons demontre que le Mo[O.sub.3-x] a un effet positif sur la decomposition thermique de la perovskite moleculaire a base de perchlorate d'ammonium [([H.sub.2]DABCO)[[NH.sub.4]([ClO.sub.4]).sub.3]] (DAP4). Nous avons prepare le Mo[O.sub.3-x] par traitement thermique et nous avons caracterise sa morphologie, sa structure et sa performance de decomposition thermique. Les resultats de caracterisation morphologique et structurale ont montre que le [Mo.sub.3-x] est un materiau de structure lamellaire irreguliere et que l'element Mo se trouvait principalement dans l'etat de valence chimique +6, dont une faible proportion de [Mo.sup.5+]. Les resultats de l'analyse thermique ont montre que la temperature maximale de decomposition thermique du DAP4 etait effectivement reduite, passant de 394,4 [degrees]C a 353,7 [degrees]C, a 321,4 [degrees]C et a 312,5 [degrees]C en presence de 1 %, de 5 % et de 10 % Mo[O.sub.3-x], respectivement. Il est particulierement important de noter que le debit calorifique maximal du melange de DAP4 a 10 % de Mo[O.sub.3-x] a ete multiplie par 4,9 par rapport a celui du DAP4 pur. A l'aide des deux methodes classiques de la cinetique de decomposition thermique, celles de Kissinger et de Starink, nous avons determine de maniere fiable les parametres cinetiques du DAP4/Mo[O.sub.3-x]. L'augmentation de la constante de vitesse de reaction k indique que la vitesse maximale de la reaction de decomposition thermique du DAP4 est effectivement accrue. Ces travaux permettent de proposer une technologie realiste faisant appel au Mo[O.sub.3-x] comme catalyseur efficace pour ameliorer la performance thermique du DAP4. Mots-cles : Mo[O.sub.3-x], perovskite moleculaire, [([H.sub.2]DABCO)[[NH.sub.4]([ClO.sub.4]).sub.3]] DAP-4, catalyse, decomposition thermique.

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Gale Document Number: GALE|A678582822