A highly active Ni catalyst supported on Mg-substituted LaAlO3 for carbon dioxide reforming of methane

Bai, Xiaoli; Xie, Guiming; Guo, Yu; Tian, Long; El-Hosainy, Hamza; Awadallah, Ahmed E.; Ji, Shengfu; Wang, Zhou‐jun

doi:10.1016/j.cattod.2019.12.033

Cited by 65 publications

(33 citation statements)

References 38 publications

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“…Surface basicity has been recognized as one of the crucial structural parameters for the anti‐coke property of reforming catalysts because activated CO 2 on basic sites would react with surface carbon species to avoid coke formation 7–10 . Figure 6 depicts CO 2 ‐TPD profiles of the reduced catalysts.…”

Section: Resultsmentioning

confidence: 99%

“…It is generally acknowledged that stronger metal–support interactions would lead to smaller size of Ni nanoparticles and better anti‐sintering property of the catalyst. Moreover, very small Ni nanoparticles would efficiently inhibit carbon deposition on the catalyst surface 7–9 . Therefore, the superior stability of the Ni/m‐ZrO 2 @Al 2 O 3 catalyst may be further rationalized by the strengthened metal–support interactions due to confinement effect.…”

Section: Resultsmentioning

confidence: 99%

“…The reforming activity is determined by various structural parameters, among which metal size, surface basicity and metal–support interactions are salient catalyst properties 7–10 . The above structural characterizations revealed that the crystal phase of the ZrO 2 support mainly influences the porosity and metal–support interactions of the supported Ni catalysts.…”

Section: Resultsmentioning

confidence: 99%

“…Ni‐based catalysts have been recognized as the most promising candidates for CO 2 reforming of methane owing to their high activity and low cost 7,8 . The bottleneck for current Ni‐based catalysts lies in quick deactivation due to metal sintering and/or carbon deposition 9 .…”

Section: Introductionmentioning

confidence: 99%

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A nanoscale Ni/ZrO₂ catalyst coated with Al₂O₃ for carbon dioxide reforming of methane

Wang

Bai

Guo

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUNDCO2 reforming of methane, also known as dry reforming of methane, has received significant attention because this technology can convert notorious greenhouse gases (CH4/CO2) into useful syngas (H2/CO). However, this technology still has not been commercialized, primarily due to the lack of feasible catalysts.RESULTSBased on zirconia (ZrO2) nanoparticles with pure monoclinic (m) or tetragonal (t) crystal phase, three nickel catalysts (Ni/m‐ZrO2, Ni/t‐ZrO2 and Ni/m‐ZrO2@Al2O3) have been synthesized for CO2 reforming of methane. The Ni/t‐ZrO2 catalyst exhibited the lowest reforming activity with CH4 conversion of 15.5% at 700 °C under 1 atm with a gas hourly space velocity of 96 000 mL (h gcat)−1. The Ni/m‐ZrO2 catalyst showed much higher initial activity but underwent severe deactivation, during which CH4 conversion decreased from 56.1% to 33.4% after 300 min of reaction. The nanocomposite Ni/m‐ZrO2@Al2O3 catalyst with confinement effect exhibited the best activity and good stability. Specifically, its CH4 conversion decreased merely from 60.2% to 55.3% after 24 h of reaction.CONCLUSIONSStructural characterizations demonstrate that limited specific surface area and weak metal–support interactions existed on the Ni/t‐ZrO2 catalyst, which led to large nickel nanoparticles and thus poor reforming activity. Both Ni/m‐ZrO2 and Ni/m‐ZrO2@Al2O3 catalysts had high specific surface area and very small nickel nanoparticles, which may rationalize the high reforming activity. The improved stability of the Ni/m‐ZrO2@Al2O3 catalyst was mainly related to the alleviated carbon deposition resulting from enriched surface basicity and strengthened metal–support interactions. © 2020 Society of Chemical Industry (SCI)

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A nanoscale Ni/ZrO₂ catalyst coated with Al₂O₃ for carbon dioxide reforming of methane

Wang

Bai

Guo

et al. 2020

J of Chemical Tech & Biotech

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“…With increasing carbon dioxide (CO 2 ) emission and growing concern for climate change, the conversion of CO 2 into high-value-added chemicals has attracted great attention in the management and utilization of CO 2 . , Reforming of methane with CO 2 (dry reforming of methane, DRM) is regarded as a promising process in profitable industrial application. − The syngas (mixture of H 2 and CO) produced via DRM has a low H 2 /CO ratio around 1, which can be used as a versatile feedstock to synthesize valuable chemicals such as acetic acid, dimethyl ether, and long-chain hydrocarbons by Fischer–Tropsch synthesis. , In addition, this reaction does not need water, whereby it is suitable for the arid region. In addition, as a strong endothermic reaction, DRM is a perfect way to store and transport energy.…”

Section: Introductionmentioning

confidence: 99%

Stabilizing Ni-Co Alloy on Bimodal Mesoporous Alumina to Enhance Carbon Resistance for Dry Reforming of Methane

Yuan

et al. 2021

Ind. Eng. Chem. Res.

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Alloying nickel with a transition metal and further stabilizing an active metal on bimodal support are regarded as a promising strategy to improve carbon resistance for dry reforming of methane (DRM) reaction. In this work, a bimodal mesoporous alumina-supported Ni-Co alloy catalyst (NiCo/MMAl) was prepared via the evaporation-induced self-assembly method and employed to catalyze DRM reaction. The promotive effect of Ni-Co alloy with a bimodal porous structure on the carbon resistance was investigated. The presence of Ni-Co alloy was confirmed on porous alumina. The NiCo/MMAl catalyst possessed two porous structures, a small-sized mesopore at 10 nm and a large-sized one at 40 nm. NiCo/ MMAl exhibited enhanced carbon resistance, in which only 2.3% carbon formed on the catalyst surface, lower than a unimodal mesoporous aluminasupported NiCo catalyst (NiCo/MAl, 12%) and Ni catalyst (Ni/MAl, 24%). The kinetic study suggested that on the unimodal mesoporous alumina, alloying Ni with Co increased the activation energy of CH 4 dissociation (∼66 kJ/mol) compared to Ni/MAl (51.7 kJ/mol), thus showing high activity for suppressing CH 4 dissociation. In addition, the large-sized mesoporous structure on NiCo/MMAl favored mass transport. As a result, the enhanced carbon resistance for NiCo/MMAl was not only attributed to the suppression of CH 4 dissociation by Ni-Co alloy but also to the promotive effect of the large-sized mesopore structure on enhancing mass transport.

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Unbounding the Future: Designing NiAl‐Based Catalysts for Dry Reforming of Methane

Zhang,

Zhao,

Song

et al. 2024

Chemistry An Asian Journal

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Dry reforming of methane (DRM), the catalytic conversion of CH4 and CO2 into syngas (H2 + CO), is an important process closely correlated to the environment and chemical industry. NiAl‐based catalysts have been reported to exhibit excellent activity, low cost, and environmental friendliness. At the same time, the rapid deactivation caused by carbon deposition, Ni sintering, and phase transformation exerts great challenges for its large‐scale applications. This review summarizes the recent advances in NiAl‐based catalysts for DRM, particularly focusing on the strategies to construct efficient and stable NiAl‐based catalysts. Firstly, the thermodynamics and elementary steps of DRM, including the activation of reactants and coke formation and elimination, are summarized. The roles of Al2O3 and its mixed oxides as the support, and the influences of the promoters employed in NiAl‐based catalysts over the DRM performance, are then illustrated. Finally, the design of anti‐coking and anti‐sintering NiAl‐based catalysts for DRM is suggested as feasible and promising by tailoring the structure and states of Ni and the modification of Al‐based supports including small Ni size, high Ni dispersion, proper basicity, strong metal‐support interaction (SMSI), active oxygen species as well as high phase stability.

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A highly active Ni catalyst supported on Mg-substituted LaAlO3 for carbon dioxide reforming of methane

Cited by 65 publications

References 38 publications

A nanoscale Ni/ZrO₂ catalyst coated with Al₂O₃ for carbon dioxide reforming of methane

A nanoscale Ni/ZrO₂ catalyst coated with Al₂O₃ for carbon dioxide reforming of methane

Stabilizing Ni-Co Alloy on Bimodal Mesoporous Alumina to Enhance Carbon Resistance for Dry Reforming of Methane

Unbounding the Future: Designing NiAl‐Based Catalysts for Dry Reforming of Methane

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A highly active Ni catalyst supported on Mg-substituted LaAlO3 for carbon dioxide reforming of methane

Cited by 65 publications

References 38 publications

A nanoscale Ni/ZrO2 catalyst coated with Al2O3 for carbon dioxide reforming of methane

A nanoscale Ni/ZrO2 catalyst coated with Al2O3 for carbon dioxide reforming of methane

Stabilizing Ni-Co Alloy on Bimodal Mesoporous Alumina to Enhance Carbon Resistance for Dry Reforming of Methane

Unbounding the Future: Designing NiAl‐Based Catalysts for Dry Reforming of Methane

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A nanoscale Ni/ZrO₂ catalyst coated with Al₂O₃ for carbon dioxide reforming of methane

A nanoscale Ni/ZrO₂ catalyst coated with Al₂O₃ for carbon dioxide reforming of methane