Kinetics of the thermal decomposition of γ-irradiated cobaltous acetate

Alshehri, Saad M.; Monshi, M. A. S.; El-Salam, N. M. Abd; Mahfouz, R. M.

doi:10.1016/s0040-6031(00)00602-x

Cited by 36 publications

(17 citation statements)

References 9 publications

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“…As the nuclei grow larger they must eventually impinge on one another, so that growth ceases where they touch. This process has been considered by Erofe'ev, who has given the function A 3 of nuclei growth model [28]. Models 2-3 reflect the chemical kinetics with a rate law based on the reaction order.…”

Section: Kinetics Approachesmentioning

confidence: 99%

Devolatilization behavior and pyrolysis kinetics of potential Tunisian biomass fuels

Jeguirim

Elmay

Limousy

et al. 2014

Env Prog and Sustain Energy

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Biomass thermochemical conversion is complex and requires a good understanding of the thermal decomposition process. This process may be identified using mass loss kinetics which are useful for the design of proper equipment used for biomass conversion. This work aims to determine devolatilization kinetic parameters characterizing four Tunisian biomass species: industrial by product (Pine Sawdust), agro‐industrial by product (Olive Solid Waste), agricultural residue (Date Palm Trunk) and seaweed (Posidonia Oceanica) using data from non‐isothermal thermogravimetry and the Coats and Redfern calculation method. Decomposition TG and DTG data were analyzed by applying 10 kinetic models including processes governed by nuclei growth, surface nucleation followed by geometric, diffusion and chemical reaction models. Obtained results show that biomass pyrolysis is represented by two successive steps: (i) devolatilization stage characterized by high weight loss rate, which is well described by diffusional, surface nucleation followed by geometric and first order chemical reaction models. (ii) char formation stage characterized by low weight loss rate, which is well described by second order and third order chemical reaction models. © 2014 American Institute of Chemical Engineers Environ Prog, 33: 1452–1458, 2014

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Section: Kinetics Approachesmentioning

confidence: 99%

Devolatilization behavior and pyrolysis kinetics of potential Tunisian biomass fuels

Jeguirim

Elmay

Limousy

et al. 2014

Env Prog and Sustain Energy

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“…*Email: drjayashrita@yahoo.co.in X-ray diffraction studies revealed that irradiation leads to lattice distortion resulting in changes in lattice parameters, crystallinity, relative intensity of peaks, and so on. (3,(8)(9)(10). infrared (IR) spectral studies indicated a decrease in the intensity of bands upon irradiation (3,(10)(11)(12).…”

Section: Introductionmentioning

confidence: 99%

“…(13)(14)(15). Microscopic investigations of gamma-irradiated materials suggested changes in texture and surface morphology (8,10,16). Thus, irradiation-induced decomposition and subsequent changes in various physicochemical properties of salts and technologically useful materials have been investigated.…”

Section: Introductionmentioning

confidence: 99%

Effect of gamma-irradiation on thermal decomposition kinetics, X-ray diffraction pattern and spectral properties of tris(1,2-diaminoethane)nickel(II)sulphate

Jayashri

Krishnan

Rani

2014

Radiation Effects and Defects in Solids

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Tris(1,2-diaminoethane)nickel(II)sulphate was prepared, and characterised by various chemical and spectral techniques. The sample was irradiated with 60 Co gamma rays for varying doses. Sulphite ion and ammonia were detected and estimated in the irradiated samples. Non-isothermal decomposition kinetics, X-ray diffraction pattern, Fourier transform infrared spectroscopy, electronic, fast atom bombardment mass spectra, and surface morphology of the complex were studied before and after irradiation. Kinetic parameters were evaluated by integral, differential, and approximation methods. Irradiation enhanced thermal decomposition, lowering thermal and kinetic parameters. The mechanism of decomposition is controlled by R 3 function. From X-ray diffraction studies, change in lattice parameters and subsequent changes in unit cell volume and average crystallite size were observed. Both unirradiated and irradiated samples of the complex belong to trigonal crystal system. Decrease in the intensity of the peaks was observed in the infrared spectra of irradiated samples. Electronic spectral studies revealed that the M-L interaction is unaffected by irradiation. Mass spectral studies showed that the fragmentation patterns of the unirradiated and irradiated samples are similar. The additional fragment with m/z 256 found in the irradiated sample is attributed to S 8 + . Surface morphology of the complex changed upon irradiation.

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“…However, details of the kinetics were not reported [2]. Previous work on the thermal decomposition of metal acetates indicated that the isothermal decomposition kinetics could be affected markedly by prior exposure to ionizing radiation [3][4][5]. In general, the effects with increasing dose are a shortening of the induction period followed by an overall decrease in time required to complete the reaction [6].…”

Section: Introductionmentioning

confidence: 99%

Isothermal decomposition of γ-irradiated palladium acetate

Mahfouz¹,

Alshehri²,

Monshi³

et al. 2004

Radiation Effects and Defects in Solids

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The isothermal decomposition of un-irradiated (pristine) and pre-γ -irradiated palladium acetate was studied in the temperature range (498-508 K) and in air using the isothermal thermogravimetric technique. The data were analysed using various solid state reaction models. The results showed that the kinetics of isothermal decomposition of palladium acetate was governed by random nucleation reaction (Erofe'ev equation A 3 ). The activation energies of the main decomposition process for un-irradiated and pre-γ -irradiated samples were calculated. The change in texture and crystal structure of the investigated palladium acetate by γ -irradiation was studied using electron microscopy and X-ray diffraction techniques.

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Kinetics of the thermal decomposition of γ-irradiated cobaltous acetate

Cited by 36 publications

References 9 publications

Devolatilization behavior and pyrolysis kinetics of potential Tunisian biomass fuels

Devolatilization behavior and pyrolysis kinetics of potential Tunisian biomass fuels

Effect of gamma-irradiation on thermal decomposition kinetics, X-ray diffraction pattern and spectral properties of tris(1,2-diaminoethane)nickel(II)sulphate

Isothermal decomposition of γ-irradiated palladium acetate

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