Thermal reactions of lead(IV) chloride complexes in the solid state. Part V. Thermolysis of mono-n-alkylammonium hexachloroplumbates

Błażejowski, Jerzy; Szychlinski, J.; Kowalewska, Ewa

doi:10.1016/0040-6031(93)85031-4

Cited by 13 publications

(3 citation statements)

References 25 publications

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“…It has been suggested that amine hydrochlorides dissociate with the release of amines and HCl (both are in gas phase). [28][29][30][31][32][33] Therefore, the proposed dissociation process (pathway 1) can be described by the following equation:…”

Section: The Reaction Pathway Determinationmentioning

confidence: 99%

“…[22][23][24][25][26][27] A pilot plant where TEHA is used to recycle HCl by applying thermal dissociation approach in the process of making ethanol from biomass has been built. 26,27 Much work has been done mainly by Jerzy Błazejowski, for the mechanism of thermal dissociation of amine hydrochlorides (including NH 4 Cl) which could be expressed by the general formula [C n H 2n+1 NH 3 ]Cl, with n = 0 − 8 [28][29][30][31] and [(C n H 2n+1 ) p NH 4−p ]Cl, with n = 1-4, p = 2-4. [32][33][34][35] Irrespective of the chain-length, the thermal dissociation of amine hydrochlorides occurs in one step just as NH 4 Cl does, which could be expressed by equation:…”

Section: Introductionmentioning

confidence: 99%

“…The amine should thus appear along with HCl in the gas phase. 28,29,32 In Jerzy Błazejowski's work, TG/DTG/ DTA curves of tertiary amine hydrochlorides were drawn, indicating that there is only one endothermic peak. Unlike the amine hydrochlorides mentioned above, the thermal dissociation process of TOAHCl was somewhat different due to TOA's high boiling point (365.8 • C), which is over 150 • C higher than the dissociation temperature.…”

Section: Introductionmentioning

confidence: 99%

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Mechanism studies on thermal dissociation of tri-n-octylamine hydrochloride with FTIR, TG, DSC and quantum chemical methods

et al. 2017

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The thermal dissociation of tri-n-octylamine hydrochloride (TOAHCl) was investigated using both the quantum chemical simulation and experimental methods. The pathway through which a mixture of trin-octylamine (TOA) and hydrogen chloride (HCl), rather than din -octylamine (DOA) and 1-chlorooctane, are produced has been determined through transition state (TS) search with Intrinsic Reaction Coordinate (IRC) calculations. Particularly, strong agreement between the experimental FTIR spectra and that of TOA demonstrates the same result for the first time. Moreover, the thermal dissociation of TOAHCl proceeds in two continuous steps, which is different from the low molecular mass amine hydrochlorides. The experimental enthalpy of the dissociation was 70.793 kJ mol −1 with DSC measurement which is very close to the density functional theory (DFT) calculation result 69.395 kJ mol −1. Furthermore, with the aid of DFT calculations, some other important thermochemical characteristics such as crystal lattice energy with the value of 510.597 kJ mol −1 were evaluated by means of Born-Fajans-Haber cycle.

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Section: The Reaction Pathway Determinationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanism studies on thermal dissociation of tri-n-octylamine hydrochloride with FTIR, TG, DSC and quantum chemical methods

et al. 2017

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Activation energy of the thermal decomposition of ammonium metavanadate. A thermogravimetric study

Askar

Girgis

Khilla

1989

Journal of Thermal Analysis

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The thermogravimetric curves of the title compound (AMV), recorded at two rates of heating (10 and 1.25 degmin-1), exhibited two separate steps of weight loss (at 423-513 and 513-613 K). The TG curves were analysed by testing 18 solid-state reaction equations associated with the methods of Coats and Redfern (1964), ~atava and gkvfira (1969) and Blazejowski et al. (1983). On the basis of linearization procedures, high-order reactions with n = 1.5 and 2.0 best described the two TG steps. The activation energies of the two conversion stages are: first stage: 163.6 and 152.6 kJ mol-~, and second stage: 238.1 and 167.7 kJ mol-1 (low and high heating rates, respectively).The overall reaction for the thermal decomposition of ammonium metavanadate (AMV) is generally represented as 2 NH4VO, 3 --}V2Os + 2 NH 3 + H20 accompanied by a total weight loss of 22.2% of the original sample weight. The decomposition does not take place in a single stage, but in several stages, and there is still little agreement as to the intermediates formed, the results depending on the method of detection and characterization.

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Dehydration kinetics of hydrated iron oxide from dynamic thermogravimetry

Petro

Girgis

1988

Journal of Thermal Analysis

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The thermal treatment of Fe203 -[.65H20 gives rise to sharp dehydration weight-change waves (310M70 K and 470-670 K) which correspond to the loss of loosely-bound and stronglybound water, respectively. Analysis of the thermal waves was perlormed by the method of Satava and Skvara (1969), the modified method of Coats and Redfern (1964) and the method of Blazejowski et al. (1983), and by applying a least squares straight line fit to the data. The/I 2 and /13 decomposition mechanisms predominate in the first dehydration step, whereas at/ F~ mechanism seems the best to describe dehydration of the structural water. Activation energies of 21 kJ. mol-~ and 95 kJ. mol -J are estimated for the first and second steps, respectively.The analysis of thermograviroetric curves has been the subject of a large number of publications [1 16]. It aims at deriving certain kinetic parameters from a single TG curve. These are: order and mechanism of reaction, activation energy and Arrhenius frequency factor.To describe the rate of weight change, several expressions have been used to cover different solid-state decomposition mechanisms, e.g. phase boundary-controlled processes, nucleation processes, nucleation followed by linear or bulk growth of nuclei, or diffusion-controlled processes. The most predominant or probable mechanism would be that which satisfies optimization of the fractional weightchange data throughout the whole range of temperature considered.The thermal analysis of hydrated iron oxide has been reported by some authors [17,18]. Loss of water usually occurs in two temperature ranges, giving a lowtemperature effect and a high temperature effect. The former is attributed to the loss of physically adsorbed water (loosely bound), and the latter to the loss of structural water (strongly bound). However, a distinction between these two categories can be made not only via their positions in the TG or DTA curves, but also through the activation energy associated with each dehydration.John Wiler & Sons, Limited, Chichester AkadOmiai Kiad6. Budapest

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Thermal reactions of lead(IV) chloride complexes in the solid state. Part V. Thermolysis of mono-n-alkylammonium hexachloroplumbates

Cited by 13 publications

References 25 publications

Mechanism studies on thermal dissociation of tri-n-octylamine hydrochloride with FTIR, TG, DSC and quantum chemical methods

Mechanism studies on thermal dissociation of tri-n-octylamine hydrochloride with FTIR, TG, DSC and quantum chemical methods

Activation energy of the thermal decomposition of ammonium metavanadate. A thermogravimetric study

Dehydration kinetics of hydrated iron oxide from dynamic thermogravimetry

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