Non-isothermal kinetics of the thermal desorption of mercury from a contaminated soil

López, Félix A.; Sierra, María José; Rodríguez, Olga; Millán, Rocío

doi:10.3989/revmetalm.001

Cited by 7 publications

(5 citation statements)

References 32 publications

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“…Three separate spikes peaking at 120, 201, and 303 °C were recorded on the Hg-TPD curve in Figure . The peak centered at 201 °C was assigned to metacinnabar (β-HgS), and the peak located at 303 °C was due to the decomposition of cinnabar (α-HgS). ,, The decomposition energy for mercury sulfides has been reported to be from 135 to 185 kJ/mol . The activation energies of Hg 0 adsorbed on the Cu-terminated sites of CuO and on Zn of ZnS are around 100 kJ/mol. ,, This value is lower than that for mercury sulfides.…”

Section: Resultsmentioning

confidence: 98%

Multiform Sulfur Adsorption Centers and Copper-Terminated Active Sites of Nano-CuS for Efficient Elemental Mercury Capture from Coal Combustion Flue Gas

et al. 2018

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Nanostructured copper sulfide synthesized with the assistance of surfactant with nanoscale particle size and high Brunauer-Emmett-Teller surface area was for the first time applied for the capture of elemental mercury (Hg) from coal combustion flue gas. The optimal operation temperature of nano-CuS for Hg adsorption is 75 °C, which indicates that injection of the sorbent between the wet flue gas desulfurization and the wet electrostatic precipitator systems is feasible. This assures that the sorbent is free of the adverse influence of nitrogen oxides. Oxygen (O) and sulfur dioxide exerted a slight influence on Hg adsorption over the nano-CuS. Water vapor was shown to moderately suppress Hg capture efficiency via competitive adsorption. The simulated adsorption capacities of nano-CuS for Hg under pure nitrogen (N), N + 4% O, and simulated flue gas reached 122.40, 112.06, and 89.43 mgHg/g nano-CuS, respectively. Compared to those of traditional commercial activated carbons and metal sulfides, the simulated adsorption capacities of Hg over the nano-CuS are at least an order of magnitude higher. Moreover, with only 5 mg loaded in a fixed-bed reactor, the Hg adsorption rate reached 11.93-13.56 μg/g min over nano-CuS. This extremely speedy rate makes nano-CuS promising for a future sorbent injection technique. The anisotropic growth of nano-CuS was confirmed by X-ray diffraction analysis and provided a fundamental aspect for nano-CuS surface reconstruction and polysulfide formation. Further X-ray photoelectron spectroscopy and Hg temperature-programmed desorption tests showed that the active polysulfide, S-S dimers, and copper-terminated sites contributed primarily to the extremely high Hg adsorption capacity and rate. With these advantages, nano-CuS appears to be a highly promising alternative to traditional sorbents for Hg capture from coal combustion flue gas.

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Section: Resultsmentioning

confidence: 98%

Multiform Sulfur Adsorption Centers and Copper-Terminated Active Sites of Nano-CuS for Efficient Elemental Mercury Capture from Coal Combustion Flue Gas

et al. 2018

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“…In continuation of the earlier work [21], the activation energy along with the other kinetics data of the decomposition of carbonized ACFs (i.e. CNs) prepared is now studied using the isoconversional (model-free) kinetic methods (FWO and FR) [3,4,[22][23][24]. The thermal reaction of combustion of carbonized ACFs can be simulated for understanding and modelling of combustion furnace without any assumption of reaction mechanism by using these model-free kinetic methods [25].…”

Section: Introductionmentioning

confidence: 99%

Thermal behaviour of low-rank Indian coal fines agglomerated with an organic binder

Das

Baruah

Saikia

2016

J Therm Anal Calorim

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The combustion kinetic parameters of the carbonized agglomerated coal fines (ACFs) were determined by thermogravimetric analysis under oxy-non-isothermal conditions for planning, designing, and operating the related combustion systems at an industrial scale. Friedman and Flynn-Wall-Ozawa methods were applied to determine the activation energies (E) and pre-exponential factors (A) of the thermal decomposition of ACFs. The multivariate nonlinear regression analyses were performed to find out the formal mechanisms, kinetic model, and the corresponding kinetic triplets. The results revealed the n-dim. Avrami-Erofeev (An) and nth-order (Fn) mechanism responsible for the decomposition of the carbonized ACFs. The activation energy of the combustion of carbonized ACFs is found to be in the range of 132.75-191.57 kJ mol -1 .

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“…El análisis cinético de la reacción exotérmica de formación de FeNi 3 , se realizó utilizando la ecuación usual de Avrami-Erofeev (Donoso et al, 2012a;Donoso et al, 2012b;López et al, 2014), empleada para reacciones heterogéneas, bajo condiciones no isotermas:…”

Section: Resultados Y Discusiónunclassified

Estudio cinético de las reacciones de recocido en aleaciones de Cu-Ni-Fe

Donoso¹

2014

REVMETAL

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RESUMEN:Mediante Calorimetría Diferencial de Barrido (DSC) y medidas de microdureza Vickers se ha estudiado el comportamiento durante el recocido de las aleaciones Cu-45Ni-4Fe, Cu-34Ni-11Fe y Cu-33Ni-22Fe templadas desde 1173 K. El análisis de las curvas DSC, desde temperatura ambiente hasta los 950 K, muestran la presencia de una reacción exotérmica asociada a la formación de la fase FeNi 3 que nuclea a partir de una estructura modulada, y una reacción endotérmica que correspondería a la disolución de esta fase. Los paráme-tros cinéticos se calcularon a partir de la ecuación usual de Avrami-Erofeev, Kissinger modificado y funciones cinéticas integradas. Medidas de microdureza Vickers corroboraron la formación y disolución de fase FeNi 3 . PALABRAS CLAVES: ABSTRACT: Kinetic study of the annealing reactions in Cu-Ni-Fe alloys.The thermal aging of a Cu-45Ni-4Fe, Cu-34Ni-11Fe and Cu-33Ni-22Fe alloys tempered from 1173 K have been studied from Differential Scanning Calorimetry (DSC) and microhardness measurements. The analysis of DSC curves, from room temperature to 950 K, shows the presence of one exothermic reaction associated to the formation of FeNi 3 phase nucleating from a modulate structure, and one endothermic peak attributed to dissolution of this phase. Kinetic parameters were obtained using the usual Avrami-Erofeev equation, modified Kissinger method and integrated kinetic functions. Microhardness measurements confirmed the formation and dissolution of the FeNi 3 phase.

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Non-isothermal kinetics of the thermal desorption of mercury from a contaminated soil

Cited by 7 publications

References 32 publications

Multiform Sulfur Adsorption Centers and Copper-Terminated Active Sites of Nano-CuS for Efficient Elemental Mercury Capture from Coal Combustion Flue Gas

Multiform Sulfur Adsorption Centers and Copper-Terminated Active Sites of Nano-CuS for Efficient Elemental Mercury Capture from Coal Combustion Flue Gas

Thermal behaviour of low-rank Indian coal fines agglomerated with an organic binder

Estudio cinético de las reacciones de recocido en aleaciones de Cu-Ni-Fe

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