Highly stable low noble metal content rhodium-based catalyst for the dry reforming of methane

Moreira, Thiago Gomes de Araújo; Filho, José Faustino Souza de Carvalho; Carvalho, Yuri Mariano; Almeida, João Monnerat Araujo Ribeiro de; Romano, Pedro Nothaft; Sousa-Aguiar, Eduardo Falabella

doi:10.1016/j.fuel.2020.119536

Cited by 54 publications

(16 citation statements)

References 29 publications

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“…A site density, ξ tot , of 1.8586 × 10 19 sites·m –2 referring to a face-centered cubic (fcc) Ni(111) lattice plane is used. The specific surface area is of attention, as the value used is 1–2 orders of magnitude lower than typical values of supported catalysts, e.g., on silica and titania , or alumina. ,, During preliminary simulations, it was seen that the order of magnitude of a cat significantly impacts the computational cost of the model, relating to the catalyst’s surface-to-volume ratio. It was hence decided to use a lower specific surface area value to model efficiently long time scales (see Sections –3.4) and study the impact of higher, more realistic, a cat values on energy efficiency in Section .…”

Section: Methodsmentioning

confidence: 99%

“…Plasma-catalysis is a promising alternative for the direct upgrading of methane into higher-value products as it allows the conversion of methane at much lower temperatures than traditional thermal-catalytic routes. , The plasma-activated upgrading of methane in the presence or absence of oxidants has been the subject of numerous experimental investigations in the last two decades. A variety of catalysts and plasma discharges have been studied, − confirming the feasibility of the process. Nonetheless, a commonly reported issue is the lack of understanding of mechanistic details leading to observed performances.…”

Section: Introductionmentioning

confidence: 90%

“…2 6 (10) where ξ tot (sites•m −2 ) is the site density and A cat (m 2 ) is the total surface of the catalyst. It is assumed that there is no gas expansion in the reactor, so the reactor inlet and outlet volumetric flows are equal.…”

Section: Turnover Frequencies (Tofs)mentioning

confidence: 99%

“…As the latter lead to an increase of the gas bulk temperature, recent plasma-catalysis modeling studies have considered temperatures higher than ambient. , To account for this, the impact of temperature on gas and surface processes is investigated in this work in the range from 300 to 600 K at time scales on the order of experimental reactors. Nickel is chosen as a catalyst due to its known capacity to activate C–H bonds and wide application in methane-upgrading processes. ,,− The Ni(111) facet is considered as it is the most common plane in real polycrystalline supported metal catalysts. The performance of the plasma-catalytic reactor at different temperatures is further compared with the equivalent plasma-only and catalysis-only reactors to elucidate the interactions of the two phases.…”

Section: Introductionmentioning

confidence: 99%

“…Nickel is chosen as a catalyst due to its known capacity to activate C–H bonds and wide application in methane-upgrading processes. 5 , 10 , 33 − 37 The Ni(111) facet is considered as it is the most common plane in real polycrystalline supported metal catalysts. The performance of the plasma-catalytic reactor at different temperatures is further compared with the equivalent plasma-only and catalysis-only reactors to elucidate the interactions of the two phases.…”

Section: Introductionmentioning

confidence: 99%

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Plasma-Catalysis of Nonoxidative Methane Coupling: A Dynamic Investigation of Plasma and Surface Microkinetics over Ni(111)

2022

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A heterogeneous catalytic microkinetic model is developed and implemented in a zero-dimensional (0D) plasma model for the dynamic study of methane nonoxidative coupling over Ni(111) at residence times and power densities consistent with experimental reactors. The microkinetic model is thermodynamically consistent and is parameterized based on the heats of chemisorption of surface species on Ni(111). The surface network explicitly accounts for the interactions of plasma species, namely, molecules, radicals, and vibrationally excited states, with the catalyst active sites via adsorption and Eley−Rideal reactions. The Fridman−Macheret model is used to describe the enhancement of the rate of the dissociative adsorption of vibrationally excited CH 4 , H 2 , and C 2 H 6 . In combination with a previously developed detailed kinetic scheme for nonthermal methane plasma, 0D simulation results bring insights into the complex dynamic interactions between the plasma phase and the catalyst during methane nonoxidative coupling. Differential turnover frequencies achieved by plasmacatalysis are higher than those of equivalent plasma-only and catalysis-only simulations combined; however, this performance can only be sustained momentarily. Hydrogen produced from dehydrogenation of ethane via electron collisions within the plasma is found to quickly saturate the surface and even promote the conversion of surface CH 3 * back to methane.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 90%

Section: Turnover Frequencies (Tofs)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Plasma-Catalysis of Nonoxidative Methane Coupling: A Dynamic Investigation of Plasma and Surface Microkinetics over Ni(111)

2022

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Process Optimization for Syngas Production from the Dry Reforming of Methane over 5Ni+3Sr/10Zr+Al Catalyst Using Multiple Response Surface Methodology

Al‐Fatesh,

El‐Salamony,

Roushdy

et al. 2023

Adv Materials Inter

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Abstract5Ni+3Sr/10Zr+Al catalyst is synthesized using the impregnation method, characterized, and tested for dry reforming of methane. The influence of reaction temperature, feed ratio (CO2/CH4), and gas hour space velocity are examined using multiple response surface methodology through three factors in, a four‐level central composite design. Second and higher‐order regression models are applied to evaluate the interaction between the process parameters and responses. The results indicate that the reaction temperature is the most influential followed by the space velocity, while the feed ratio has a weak effect. The optimum values that maximize each of the response variables are found to be the reaction temperature at 746 °C, the space velocity of 12 000 ccg−1h−1, and the feed ratio of 0.958. Under these conditions, the predicted CH4 and CO2 conversions are 86.83% and 92.27%, respectively. While the H2/CO ratio is 1.02. On the other hand, the experimental results match the predicted ones when the optimum predicted operating conditions are used for the process. A weight loss of <16% is obtained on the spent catalyst after 86 h on stream. This is attributed to the highly basic and oxidative nature of the ZrO2 co‐supported catalyst and indicates the suitability of the developed catalyst.

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Promotion impact of different strontium doping on Ni‐9La+Zr catalyst for dry reforming of methane

Ibrahim,

Al‐Fatesh,

Alwadai

et al. 2023

Energy Science & Engineering

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The potential dry reforming of methane technology allows for the synthesis of syngas from methane and carbon dioxide. Numerous investigations have been conducted on developing catalysts with exceptional activity and stability. Carbon deposition causes severe deactivation in typical nickel‐based catalysts, which is one of the most prevalent and important problems. In this study, methane was dry‐reformed over 5 wt.% Ni+xSr‐9La+Zr (x = 0–4 wt.%) catalysts for 7.5 h at 700°C and ambient pressure in a tubular fixed‐bed reactor. According to the weight percent of Sr loading, the features of the material's texture, morphology, and catalysis were investigated. N2‐physisorption, H2‐temperature programmed reduction, X‐ray diffraction, Raman, and TEM were used to evaluate the physicochemical characteristics of the catalysts. N2‐physisorption research revealed that changing the weight percentage loading of the Sr promoter had little effect on the textural qualities. The overall number of reducible NiO‐interacting species over the catalyst surface increased with increasing Sr loading. The 5Ni+2Sr‐9La+Zr catalyst exhibited the optimum CH4 and CO2 conversions of 62.9%–65.9% and 69.1%–70.3%, respectively, and the lowest deactivation factor of 4.7.

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Highly stable low noble metal content rhodium-based catalyst for the dry reforming of methane

Cited by 54 publications

References 29 publications

Plasma-Catalysis of Nonoxidative Methane Coupling: A Dynamic Investigation of Plasma and Surface Microkinetics over Ni(111)

Plasma-Catalysis of Nonoxidative Methane Coupling: A Dynamic Investigation of Plasma and Surface Microkinetics over Ni(111)

Process Optimization for Syngas Production from the Dry Reforming of Methane over 5Ni+3Sr/10Zr+Al Catalyst Using Multiple Response Surface Methodology

Promotion impact of different strontium doping on Ni‐9La+Zr catalyst for dry reforming of methane

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