Preparation of Nano-MnFe2O4 and Its Catalytic Performance of Thermal Decomposition of Ammonium Perchlorate

Abstract

Nano-MnFe 2 O 4 particles were synthesized by co-precipitation phase inversion method and low-temperature combustion method respectively, using MnCl 2 , FeCl 3 , Mn(NO 3) 2 , Fe(NO 3) 3 , NaOH and C 6 H 8 O 7. X-ray diffraction (XRD), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), thermogravimetry-differential thermal analysis (TG-DTA) and differential scanning calorimetry (DSC) were used to characterize the structure, morphology, thermal stability of MnFe 2 O 4 and its catalytic performance to ammonium perchlorate. Results showed that single-phased and uniform spinel MnFe 2 O 4 was obtained. The average particle size was about 30 and 20 nm. The infrared absorption peaks appeared at about 420 and 574 cm −1 , and the particles were stable below 524 °C. Using the two prepared catalysts, the higher thermal decomposition temperature of ammonium perchlorate was decreased by 77.3 and 84.9 °C respectively, while the apparent decomposition heat was increased by 482.5 and 574.3 J•g −1. The catalytic mechanism could be explained by the favorable electron transfer space provided by outer d orbit of transition metal ions and the high specific surface absorption effect of MnFe 2 O 4 particles. Keywords MnFe 2 O 4 , co-precipitation phase inversion method, low-temperature combustion method, ammonium perchlorate, catalysis

Catalytic Activity of Ferrates (NiFe2O4, ZnFe2O4 and CoFe2O4) on the Thermal Decomposition of Ammonium Perchlorate

“…Besides, bimetallic oxide usually owns better catalytic activity for thermal decomposition of oxidants [19][20][21]. Several kinds of bimetallic iron oxides have been fabricated and used for thermal decomposition of AP [22][23][24][25][26][27][28]. These studies confirmed the catalytic activity of the ferrates for thermal decomposition of AP, however, most of the studies involved only single ferrate.…”

Synthesis of new nanocomposite based on nanoceramic and mono substituted polyoxometalate, PMo11Cd@MnFe2O4, with superior catalytic activity for oxidative desulfurization of real fuel

“…In accordance with published literatures, [23] 50 ml solution (0.3 mol/L −1 ) containing Fe (NO 3 ) 3 .9H 2 O and Mn (NO 3 ) 2 .4H 2 O with 2:1 volume ratio was prepared in deionized water and stirred continuously. Likewise, 50 ml of citric acid solution (0.3 mol/L −1 ) was prepared and the temperature reached to 70 C while stirring.…”

“…Due to its perfect magnetic properties, it could help to recover synthesized nanocatalysts by a simple magnetic field. [22,23] In our study, MnFe 2 O 4 has been exploited as a substrate for immobilizing Keggin type POM to overcome the low surface-volume ratio and better recycling. [22] 2 | EXPERIMENTAL…”

Kinetics, Isotherm, Thermodynamics, and Recyclability of Exfoliated Graphene-Decorated MnFe2O4 Nanocomposite Towards Congo Red Dye

“…where k 2 (g/mg min) is de ned as the pseudo-second-order adsorption constant rate and H (mg/g min) is de ned as initial adsorption rate (equation 4). Tables 1 and 2 show the parameters of these models and their respective values at ve CR concentrations (20,30,40,50, and 60 mg/L) by over EG@MnFe 2 O 4 and MnFe 2 O 4 , respectively. According to Table 1, which listed kinetic parameters of the CR adsorption models over EG@ MnFe 2 O 4 , the coe cients of determination R 2 for pseudosecond-order model (0.9987-0.9997) at all CR concentrations were far higher than those for pseudo-rst-order model (0.8396-0.9749), indicating that the predicted data were well tted with experimental data.…”