Activation of CO2 on Ni/La2O3: non-isothermal kinetic study on the basis of thermogravimetric studies

Gallego, Jaime; Sierra-Gallego, G.; Tapia, Juan; Mondragón, Fanor; Batiot‐Dupeyrat, Catherine

doi:10.1007/s11144-016-1032-7

Cited by 10 publications

(6 citation statements)

References 32 publications

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“…Six different Langmuir–Hinshelwood reaction mechanisms and seven kinetic models were proposed to analyze the kinetics of the dry reforming of methane over the synthesized Ni–La 2 O 3 catalyst. These mechanisms were based on both the data collected herein and on the extensive literature on this topic. ,,,,,,,,,,,,,− In this section, the kinetics of the process is analyzed under the light of the model that best fitted the experimental data and fulfilled the thermodynamic consistency criteria, Table . The competing models are comprehensively explained in Section E, Supporting Information, and summarized in Table S8.…”

Section: Resultsmentioning

confidence: 99%

Kinetic Assessment of the Dry Reforming of Methane over a Ni–La₂O₃Catalyst

et al. 2021

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The dry reforming of methane is a promising technology for the abatement of CH 4 and CO 2 . Ni−La 2 O 3 catalysts are characterized by their long-term stability (100 h) when tested at full conversion. The kinetics of dry reforming over these types of catalysts has been studied using both power-law and Langmuir− Hinshelwood-based approaches. However, these studies typically deal with fitting the net CH 4 rate, hence disregarding competing and parallel surface processes and the different possible configurations of the active surface. In this work, we synthesized a Ni−La 2 O 3 catalyst and tested six Langmuir−Hinshelwood mechanisms considering both single and dual active sites for assessing the kinetics of dry reforming and the competing reverse water−gas shift reaction and investigated the performance of the derived kinetic models. In doing this, it was found that: (1) all of the net rates were better fitted by a single-site model that considered that the first C−H bond cleavage in methane occurred over a metal−oxygen pair site; (2) this model predicted the existence of a nearly saturated nickel surface with chemisorbed oxygen adatoms derived from the CO 2 dissociation; (3) the CO 2 dissociation can either be an inhibitory or an irrelevant step, and it can also modify the apparent activation energy for CH 4 activation. These findings contribute to a better understanding of the dry reforming reaction's kinetics and provide a robust kinetic model for the design and scale-up of the process.

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Section: Resultsmentioning

confidence: 99%

Kinetic Assessment of the Dry Reforming of Methane over a Ni–La₂O₃Catalyst

et al. 2021

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“…The kinetic study of the processing of both the base material and the products obtained was carried out in a MICROMERITICS AutoChem II Chemisorption Analyzer with data adquisition AutoChem II 2920 software 4.01 version. The apparent activation energy was calculated by Coats and Redfern method [12,13].…”

Section: Methodsmentioning

confidence: 99%

“…The resulting graphs are displayed in Figure 8. is calculated [12]. These values correspond to the axis Y and…”

Section: Calculation Of Apparent Activation Energymentioning

confidence: 99%

“…to the values of X, where β is the heating rate and T max is the temperature at which the peak of highest hydrogen consumption occurs [12]. During the reduction process, it is observed that for a lower heating rate, the temperature at which the sample begins to consume hydrogen is lower, which may be due to the fact that the slower the heating, the greater the opportunity for the oxides to react with the reducing gases of the system.…”

Section: Calculation Of Apparent Activation Energymentioning

confidence: 99%

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Thermodynamic and kinetic study of the recovery of tungsten and cobalt from tool waste

Sierra-Perez

Rojas-Reyes

Martinez-Zambrano

et al. 2018

Rev.Fac.Ing.Univ.Antioquia

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In the present research work, the recovery of tungsten and cobalt from waste coming from tungsten carbide-cobalt (WC-Co) tools, which are widely used in the metalworking industry, was analyzed. The WC-Co waste was characterized by X-ray diffraction and scanning electron microscopy with microanalysis (SEM/EDS). The process started with the oxidation of the waste to obtain a mixture of oxides (WO 3 and CoWO 4 ). The ΔH and ΔG were calculated both for the oxidation and reduction processes. Thermodynamic and non-isothermal kinetic analyses were carried out to obtain a stability diagram where theoretical and experimental data are defined by transformation lines as a function of temperature; in addition, the apparent activation energy was determined. By a hydrogen reduction process, high-purity tungsten and cobalt in metallic form were obtained. RESUMEN:En el presente proyecto se analiza la recuperación de wolframio y cobalto a partir de residuos de herramientas fabricadas con carburo de wolframio -cobalto (WC-Co), las cuales son muy empleadas en la industria metalmecánica. El residuo de WC-Co se caracterizó por difracción de rayos X y microscopia electrónica de barrido con microanálisis (SEM/EDS). El proceso inició con la oxidación del residuo para obtener una mezcla de óxidos (WO 3 y CoWO 4 ). Se calculó el ΔH y el ΔG tanto para el proceso de oxidación como para el proceso de reducción. Un análisis termodinámico y un análisis cinético no isotérmico entregó una figura donde se combinan datos teóricos y datos experimentales con transformaciones perfectamente delimitadas; además se calculó la energía de activación aparente de este proceso. El proceso de reducción con hidrógeno entregó wolframio y cobalto en forma metálica con alta pureza..

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“…These mechanisms were based on both the data collected herein and on the extensive literature on this topic. 4,5,10,11,17,19,25,35,36,71,73,74,[76][77][78][79][80] In this section, the kinetics of the process is analyzed under the light of the model that best fitted the experimental data and fulfilled the thermodynamic consistency criteria, Table 2. The competing models are comprehensively explained in the Supplementary Information, section E, and summarized in Table S8.…”

Section: Six Different Langmuir-hinshelwood Reaction Mechanisms and Smentioning

confidence: 99%

Kinetic Assessment of the Dry Reforming of Methane over a Solid Solution Ni–La Oxide Catalyst

Sandoval-Bohorquez

Morales-Valencia²,

Castillo‐Araiza³

et al. 2021

Preprint

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The dry reforming of methane is a promising technology for the abatement of CH4 and CO2. Solid solution Ni–La oxide catalysts are characterized by their long–term stability (100h) when tested at full conversion. The kinetics of dry reforming over this type of catalysts has been studied using both power law and Langmuir–Hinshelwood based approaches. However, these studies typically deal with fitting the net CH4 rate hence disregarding competing and parallel surface processes and the different possible configurations of the active surface. In this work, we synthesized a solid solution Ni–La oxide catalyst and tested six Langmuir–Hinshelwood mechanisms considering both single and dual active sites for assessing the kinetics of dry reforming and the competing reverse water gas shift reaction and investigated the performance of the derived kinetic models. In doing this, it was found that: (1) all the net rates were better fitted by a single–site model that considered that the first C–H bond cleavage in methane occurred over a <a>metal−oxygen </a>pair site; (2) this model predicted the existence of a nearly saturated nickel surface with chemisorbed oxygen adatoms derived from the dissociation of CO2; (3) the dissociation of CO2 can either be an inhibitory or an irrelevant step, and it can also modify the apparent activation energy for CH4 activation. These findings contribute to a better understanding of the dry reforming reaction's kinetics and provide a robust kinetic model for the design and scale–up of the process.

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Activation of CO2 on Ni/La2O3: non-isothermal kinetic study on the basis of thermogravimetric studies

Cited by 10 publications

References 32 publications

Kinetic Assessment of the Dry Reforming of Methane over a Ni–La₂O₃Catalyst

Kinetic Assessment of the Dry Reforming of Methane over a Ni–La₂O₃Catalyst

Thermodynamic and kinetic study of the recovery of tungsten and cobalt from tool waste

Kinetic Assessment of the Dry Reforming of Methane over a Solid Solution Ni–La Oxide Catalyst

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Activation of CO2 on Ni/La2O3: non-isothermal kinetic study on the basis of thermogravimetric studies

Cited by 10 publications

References 32 publications

Kinetic Assessment of the Dry Reforming of Methane over a Ni–La2O3Catalyst

Kinetic Assessment of the Dry Reforming of Methane over a Ni–La2O3Catalyst

Thermodynamic and kinetic study of the recovery of tungsten and cobalt from tool waste

Kinetic Assessment of the Dry Reforming of Methane over a Solid Solution Ni–La Oxide Catalyst

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Product

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Kinetic Assessment of the Dry Reforming of Methane over a Ni–La₂O₃Catalyst

Kinetic Assessment of the Dry Reforming of Methane over a Ni–La₂O₃Catalyst