Application of isoconversional calculation procedure to non-isothermal kinetic study: III. Thermal decomposition of ammonium cobalt phosphate hydrate

Chen, Zhipeng; Chai, Qian; Liao, Sen; He, Ya‐Ling; Li, Yu; Bo, Xiahong; Wu, Wenwei; Li, Bin

doi:10.1016/j.tca.2012.05.027

Cited by 29 publications

(15 citation statements)

References 33 publications

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“…The bending mode of the H−O−H group appears around 1690 cm −1 , suggesting the presence of crystalline water molecules in the structure, which favors the proposed crystalline structure. The antisymmetric stretching mode of PO 4 is visible in the range of ∼1100 to 1050 cm −1 , while the band at ∼950 cm −1 corresponds to the symmetric stretching modes of PO 4 , and the bands located at ∼625 and 560 cm −1 are due to the presence of the PO 4 tetrahedral in the structure . These characters confirm the typical metal phosphate structure together.…”

Section: Resultssupporting

confidence: 52%

Synergy Derived from Bimetal Co−Cu in Phosphate to Enables Ultrafast Catalytic Hydrogenated Activity in Nitrophenol Reduction

Wang

Gao

et al. 2020

ChemistrySelect

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Herein, we report Co−Cu bimetal integrated phosphate catalyst, unexpectedly enables ultrafast catalytic reduction of 4‐nitrophenol within 40 s by right of the synergy of bimetals. Impressively, the reaction induction period observed might indicate the deoxygenation of metal oxide units in phosphate, however, which was eliminated using bimetal (Co−Cu) phosphate at 30 °C and 40 °C. The calculated reaction rate constant is 4.78 min−1 at 30 °C, which exhibits a very high superiority compared to other reported cobalt‐based catalysts. This study offers the possibility for the ultrafast catalytic reduction and elimination of toxic nitrophenol using efficient‐cost transition metal catalysts.

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Section: Resultssupporting

confidence: 52%

Synergy Derived from Bimetal Co−Cu in Phosphate to Enables Ultrafast Catalytic Hydrogenated Activity in Nitrophenol Reduction

Wang

Gao

et al. 2020

ChemistrySelect

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“…Thermal analysis is a promising technology that has been used to investigate the thermal stability and decomposition kinetics of drug compounds [ 16 , 17 ]. Kinetic analysis has attracted great attention in the modern history of thermal decomposition studies [ 18 , 19 , 20 , 21 ]. Practical application mainly emphasizes the prediction of process rates and material lifetime.…”

Section: Introductionmentioning

confidence: 99%

Thermal Decomposition Behavior of Hydroxytyrosol (HT) in Nitrogen Atmosphere Based on TG-FTIR Methods

Yuan

2018

Molecules

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The thermal decomposition behavior of olive hydroxytyrosol (HT) was first studied using thermogravimetry (TG). Cracked chemical bond and evolved gas analysis during the thermal decomposition process of HT were also investigated using thermogravimetry coupled with infrared spectroscopy (TG-FTIR). Thermogravimetry-Differential thermogravimetry (TG-DTG) curves revealed that the thermal decomposition of HT began at 262.8 °C and ended at 409.7 °C with a main mass loss. It was demonstrated that a high heating rate (over 20 K·min−1) restrained the thermal decomposition of HT, resulting in an obvious thermal hysteresis. Furthermore, a thermal decomposition kinetics investigation of HT indicated that the non-isothermal decomposition mechanism was one-dimensional diffusion (D1), integral form g(x) = x2, and differential form f(x) = 1/(2x). The four combined approaches were employed to calculate the activation energy (E = 128.50 kJ·mol−1) and Arrhenius preexponential factor (ln A = 24.39 min−1). In addition, a tentative mechanism of HT thermal decomposition was further developed. The results provide a theoretical reference for the potential thermal stability of HT.

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“…The iterative procedure can be performed according to the following steps [40,41] 1. Assume h(x) or H(x) = 1 to estimate the initial value of E 1 .…”

Section: Determination Of Activation Energymentioning

confidence: 99%

“…The degrees of conversion a corresponding to four heating rates taken from two selected temperatures (175 and 180°C) were substituted into 35 types of mechanism functions [43]. The most probable mechanism function exhibits the slope and the linear correlation coefficient r 2 closest to -1.0000 and unity, respectively [41][42][43][44].…”

Section: Determination Of Activation Energymentioning

confidence: 99%

Studies of thermal decomposition kinetics and temperature dependence of thermodynamic functions of the new precursor LiNiPO4·3H2O for the synthesis of olivine LiNiPO4

Kullyakool

Siriwong

Noisong

et al. 2015

J Therm Anal Calorim

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The olivine LiNiPO 4 was synthesized via the calcination of the new precursor LiNiPO 4 Á3H 2 O at 600°C. The precursor was obtained from low-temperature (50°C) wet chemical reaction. The results from XRD, FTIR, AAS/ AES and TG/DTG/DTA techniques confirmed the formula of the title compounds. The SEM results indicated the morphologies of the hydrate precursor as thin plate particles and the calcined product as small bead particles. The BET surface area of the final calcined product at 600°C is much higher (5.807 m 2 g -1 ) than that reported in the literature (0.25 m 2 g -1 ). The kinetic triplet [activation energy, E, pre-exponential factor, A, and the most probable mechanism function, g(a)] and the thermodynamic functions of activated complexes (DS = , DH = and DG = ) for the dehydration step of LiNiPO 4 Á3H 2 O were determined and discussed. The mechanism of the dehydration process is the single-step A 3/2 (assumed random nucleation and its subsequent growth). New information, namely the isobaric molar heat capacity, experimental entropy, enthalpy and Gibbs energy changes as function of temperature (K) of LiNiPO 4 Á3H 2 O and LiNiPO 4 , was evaluated from the DSC data by third-order polynomial fitting and reported for the first time. The calculated corresponding thermodynamic functions from kinetic parameters are compared and discussed.

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Application of isoconversional calculation procedure to non-isothermal kinetic study: III. Thermal decomposition of ammonium cobalt phosphate hydrate

Cited by 29 publications

References 33 publications

Synergy Derived from Bimetal Co−Cu in Phosphate to Enables Ultrafast Catalytic Hydrogenated Activity in Nitrophenol Reduction

Synergy Derived from Bimetal Co−Cu in Phosphate to Enables Ultrafast Catalytic Hydrogenated Activity in Nitrophenol Reduction

Thermal Decomposition Behavior of Hydroxytyrosol (HT) in Nitrogen Atmosphere Based on TG-FTIR Methods

Studies of thermal decomposition kinetics and temperature dependence of thermodynamic functions of the new precursor LiNiPO4·3H2O for the synthesis of olivine LiNiPO4

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