Reaction Kinetics in Differential Thermal Analysis

Kissinger, H. E.

doi:10.1021/ac60131a045

Cited by 12,037 publications

(5,218 citation statements)

References 13 publications

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“…This behavior is reminiscent of a saturation process by depletion of available active sites. These peaks appear to have a skewed gaussian shape, which is consistent with a combination of a detrapping and a diffusion process [24].…”

Section: Resultssupporting

confidence: 67%

Characterization of trapped hydrogen in exfoliation corroded aluminium alloy 2024

et al. 1999

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Section: Resultssupporting

confidence: 67%

Characterization of trapped hydrogen in exfoliation corroded aluminium alloy 2024

et al. 1999

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“…In general, the versions of the MTA-TPD method, worked out by the author [302,303,332], make it possible to obtain the following: thermal desorption curves (or mass thermograms); the spectra of volatile components under the condition of linear heating of the sample (in the temperature range 25 -1000°C); the energy of activation of thermal desorption; and other kinetic parameters. The kinetic parameters have been estimated by known methods [341][342][343][344][345][346]. A characteristic feature of the MTA-TPD method is a high sensitivity due to the design of a pyrolysis chamber.…”

Section: Methodsmentioning

confidence: 99%

The surface chemistry of amorphous silica. Zhuravlev model

Zhuravlev

2000

Colloids and Surfaces A: Physicochemical and Engineering Aspect

2,064

142

1,967

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A review article is presented of the research results obtained by the author on the properties of amorphous silica surface. It has been shown that in any description of the surface silica the hydroxylation of the surface is of critical importance. An analysis was made of the processes of dehydration (the removal of physically adsorbed water), dehydroxylation (the removal of silanol groups from the silica surface), and rehydroxylation (the restoration of the hydroxyl covering). For each of these processes a probable mechanism is suggested. The results of experimental and theoretical studies permitted to construct the original model (Zhuravlev model-1 and model-2) for describing the surface chemistry of amorphous silica. The main advantage of this physico-chemical model lies in the possibility to determine the concentration and the distribution of different types of silanol and siloxane groups and to characterize the energetic heterogeneity of the silica surface as a function of the pretreatment temperature of SiO 2 samples. The model makes it possible to determine the kind of the chemisorption of water (rapid, weakly activated or slow, strongly activated) under the restoration of the hydroxyl covering and also to assess of OH groups inside the SiO 2 skeleton. The magnitude of the silanol number, that is, the number of OH groups per unit surface area, h OH , when the surface is hydroxylated to the maximum degree, is considered to be a physico-chemical constant. This constant has a numerical value: h OH,AVER =4.6 (least-squares method) and h OH,AVER = 4.9 OH nm − 2 (arithmetical mean) and is known in literature as the Kiselev-Zhuravlev constant. It has been established that adsorption and other surface properties per unit surface area of silica are identical (except for very fine pores). On the basis of data published in the literature, this model has been found to be useful in solving various applied and theoretical problems in the field of adsorption, catalysis, chromatography, chemical modification, etc. It has been shown that the Brunauer -EmmettTeller (BET) method is the correct method and gives the opportunity to measure the real physical magnitude of the specific surface area, S Kr (by using low temperature adsorption of krypton), for silicas and other oxide dispersed solids.

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“…21,22 It is known that the isoconversional methods demand the determination of the temperature T at which a fixed fraction of the total amount of the mass is transformed. The relationship between the temperature T and the heating rate b is given by:…”

Section: Kinetic Methods For Thermogravimetric Analysismentioning

confidence: 99%

Thermal degradation kinetics and decomposition mechanism of PBSu nanocomposites with silica-nanotubes and strontium hydroxyapatite nanorods

Roumeli

Chrissafis

Lioutas

et al. 2014

Phys. Chem. Chem. Phys.

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Novel poly(butylene succinate) (PBSu) nanocomposites containing 5 and 20 wt% mesoporous strontium hydroxyapatite nanorods (SrHNRs) and silica nanotubes (SiNTs) were prepared by melt-mixing. A systematic investigation of the thermal stability and decomposition kinetics of PBSu was performed using pyrolysis-gas chromatography-mass spectroscopy (Py-GC-MS) and thermogravimetry (TG). Thorough studies of evolving decomposition compounds along with the isoconversional and model-fitting analysis of mass loss data led to the proposal of a decomposition mechanism for PBSu. Moreover, the effects of SrHNRs and SiNTs on the thermal stability and decomposition kinetics of PBSu were also examined in detail. The complementary use of these techniques revealed that the incorporation of SiNTs in PBSu does not induce significant effects neither on its thermal stability nor on its decomposition mechanism. In contrast, the addition of SrHNRs resulted in the catalysis of the initial decomposition steps of PBSu and also in modified decomposition mechanisms and activation energies. The evolving gaseous products of PBSu and their evolution pattern in the SiNT nanocomposites were the same as in neat PBSu, while they were slightly modified for the SrHNR nanocomposites, confirming the findings from thermogravimetric analysis.

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Reaction Kinetics in Differential Thermal Analysis

Abstract: The effects of the kinetics of reactions of the type solid -» solid + gas on the corresponding differential thermal analysis pattern are explored.

Cited by 12,037 publications

References 13 publications

Characterization of trapped hydrogen in exfoliation corroded aluminium alloy 2024

Characterization of trapped hydrogen in exfoliation corroded aluminium alloy 2024

The surface chemistry of amorphous silica. Zhuravlev model

Thermal degradation kinetics and decomposition mechanism of PBSu nanocomposites with silica-nanotubes and strontium hydroxyapatite nanorods

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