Thermal kinetic analysis of a complex process from a solid-state reaction by deconvolution procedure from a new calculation method and related thermodynamic functions of Mn0.90Co0.05Mg0.05HPO4·3H2O

Sronsri, Chuchai; Boonchom, Banjong

doi:10.1016/s1003-6326(18)64834-4

Cited by 18 publications

(17 citation statements)

References 34 publications

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“…8, whereas the corresponding assignments were tabulated in Table 4. The FTIR spectra observed in this research closely like to the spectral results reported in the literatures 12,13,[15][16][17]45 The Raman spectroscopic technique was additionally applied to investigate and support the FTIR results, especially the vibrational spectroscopy of the metal oxide (M−O) bond as well as the lattice vibration by observing at the low frequency range (650−100 cm −1 ). Furthermore, the phase characteristics (α-, β-phases) of the metal pyrophosphate compounds can be observed from this spectroscopic technique.…”

Section: Resultssupporting

confidence: 74%

“…15 , manganese cobalt magnesium pyrophosphate dihydrate (Mn1.8 Co 0.1 Mg 0.1 P 2 O 7 •2H 2 O) 16 , and ammonium cobalt zinc manganese monohydrate (NH 4 Co 0.8 Zn 0.1 Mn 0.1 PO4•H2O) 17 were employed as the precursors to synthesize the ternary metal pyrophosphates, namely Mn 1.8 Co 0.1 Mg 0.1 P 2 O 7 , Mn 1.8 Co 0.1 Mg 0.1 P 2 O 7 , and Co 1.6 Zn 0.2 Mn 0.2 P 2 O 7 , respectively.…”

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confidence: 99%

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Correlation Between Structure, Chromaticity, and Dielectric Properties of Calcium Copper Pyrophosphates, Ca2−xCuxP2O7

Baitahe

Sron

Thompho

et al. 2022

Preprint

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Discoveries of the correlation between the physical properties and structure of the materials are interesting in the field of the material science and chemical engineering. This work investigated the correlation between the structure, chromaticity, and dielectric properties of calcium copper pyrophosphates, Ca2−xCuxP2O7. The solid state thermal decomposition reaction was employed to synthesize the Ca2−xCuxP2O7 by varying the mole ratio between Ca and Cu. The structure and crystallography of the pyrophosphate compounds were identified and confirmed by using an X-ray diffraction (XRD) technique. The Rietveld refinement method and the extended X-ray absorption fine structure (EXAFS) least-squares fitting technique were also applied to refine the sample crystal structure. The bond angle and bond length of samples were also obtained from the refinement method. The X-ray absorption edge energies (E0) of the synthesized compounds were investigated and the obtained results confirmed the formation of the binary metal pyrophosphates (Ca2−xCuxP2O7). The image sensor result of the Cu2P2O7 sample (x = 2.00) illustrated a yellowish-green color, while other compounds (x = 0.50−1.50) presented color tones that changed from blue-green to bluish-green. The dielectric constant (εr) of the synthesized Ca2−xCuxP2O7 were calculated by using the Clausius-Mossotti relation, and the highest εr was observed for Ca2P2O7. The Raman and Fourier transform infrared (FTIR) spectrophotometers were employed to characterize and confirm the vibrational characteristics of the P2O74− group. The experimental results demonstrated that the changing in the crystal structure of Ca2−xCuxP2O7 (i.e., bond angle of P−O−P in P2O74− and distortion phenomena in M−O6 octahedral site) can cause the correlation between the dielectric and optical properties of the sample.

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Section: Resultssupporting

confidence: 74%

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confidence: 99%

Correlation Between Structure, Chromaticity, and Dielectric Properties of Calcium Copper Pyrophosphates, Ca2−xCuxP2O7

Baitahe

Sron

Thompho

et al. 2022

Preprint

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“…A resolution of 2 cm −1 was selected with 32 scans to decrease the noise signal [18]. To prepare the infrared adsorption sample, each non-soluble (NSP30, NSP50, and NSP80) and recrystallized (RCP30, RCP50, and RCP80) product was homogeneously mixed with the potassium bromide (KBr, spectroscopic grade) powder at the mass ratio of 1:10 [19]. The obtained mixture was compressed into a small pellet form using manual hydraulic press and then placed inside a sample holder of the infrared spectrophotometer [20].…”

Section: Characterizationmentioning

confidence: 99%

Recrystallization of Triple Superphosphate Produced From Oyster Shell Waste for Agronomic Performance and Environmental Issue

Seesanong¹,

Seangarun²,

Boonchom³

et al. 2022

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Calcium dihydrogen phosphate monohydrate [Ca(H2PO4)2·H2O] (a fertilizer) was successfully synthesized by the recrystallization process by using a prepared triple superphosphate (TSP) that derived from oyster shell waste as starting material. This bio-green, eco-friendly process to produce an important fertilizer can promote a sustainable society. The shell-waste-derived TSP was dissolved in distilled water and kept at 30, 50, and 80 °C. Non-soluble powder and TSP solution were obtained. The TSP solution fraction were then dried and the recrystallized products (RCP30, RCP50, and RCP80) were obtained and confirmed as Ca(H2PO4)2·H2O. Whereas the non-soluble products (NSP30, NSP50, and NSP80) were observed as calcium hydrogen phosphate dihydrate (CaHPO4·2H2O). The recrystallized yields of RCP30, RCP50, and RCP80 were found to be 51.0%, 49.6%, and 46.3%, whereas the soluble percentages were 98.72%, 99.16%, and 96.63%, respectively. RCP30 shows different morphological plate sizes, while RCP50 and RCP80 present the coagulate crystal plates. X-ray diffractograms confirm the formation of both the NSP and RCP. The infrared adsorption spectra confirmed the vibrational characteristics of HPO42‒, H2PO4‒ and H2O existed in CaHPO4·2H2O and Ca(H2PO4)2·H2O. Three thermal dehydration steps of Ca(H2PO4)2·H2O (physisorbed water, polycondensation, and re-polycondensation) were observed. Ca(H2PO4)2 and CaH2P2O7 are the thermodecomposed products from the first and second steps, whereas the final product is CaP2O6.

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“…Where n is the reaction order. However, many authors consider other reaction models [43,44] such as phase boundary controlled reaction, diffusion, random nucleation, etc. Table 1 shows the models used in this work besides the n-order kinetics mentioned above.…”

Section: Kinetic Modelsmentioning

confidence: 99%

Torrefaction influence on combustion kinetics of Malaysian oil palm wastes

Somoza

Amez

Medić

et al. 2021

Fuel Processing Technology

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The use of renewable energy has increased in the last decades including the consumption of biofuels, so the research focused on improving these energetic vectors has increased too, developing techniques that enhance energetic properties of these fuels. In this context, torrefaction is a thermal pre-treatment that diminishes the main disadvantages present in biomass such as hygroscopicity, low calorific value per unit mass and high susceptibility to self-ignition. In this study raw and torrefied palm oil wastes samples are tested using thermogravimetric analysis (TGA) in order to study the influence of torrefaction on combustion kinetic parameters using Coats-Redfern and Freeman-Carroll methods, showing that torrefaction increases activation energy as it enhances thermal stability of the samples. The composition of the samples is also estimated using TGA through Fraser-Suzuki deconvolution showing the changes of lignin, cellulose, and hemicellulose due to torrefaction process.

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Thermal kinetic analysis of a complex process from a solid-state reaction by deconvolution procedure from a new calculation method and related thermodynamic functions of Mn0.90Co0.05Mg0.05HPO4·3H2O

Cited by 18 publications

References 34 publications

Correlation Between Structure, Chromaticity, and Dielectric Properties of Calcium Copper Pyrophosphates, Ca2−xCuxP2O7

Correlation Between Structure, Chromaticity, and Dielectric Properties of Calcium Copper Pyrophosphates, Ca2−xCuxP2O7

Recrystallization of Triple Superphosphate Produced From Oyster Shell Waste for Agronomic Performance and Environmental Issue

Torrefaction influence on combustion kinetics of Malaysian oil palm wastes

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