One-Pot Synthesis of Supported, Nanocrystalline Nickel Manganese Oxide for Dry Reforming of Methane

Xie, Xiaofeng; Otremba, Torsten; Littlewood, Patrick; Schomäcker, Reinhard; Thomas, Arne

doi:10.1021/cs3003963

Cited by 75 publications

(39 citation statements)

References 34 publications

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“…The TEM image shown in Figure 3 A indicates no CNT formation on the CuNi/Zr‐Al 2 O 3 ‐spent catalyst after 50 h reaction and the metal particles are found still to be CuNi alloy with an interfringe distance of 1.78 Å (Figure 3 B), suggesting that zirconia coating protects the CuNi alloy effectively. In terms of the acidity and basicity of the support, coke is not deposited on zirconia because it lacks a significant concentration of strong Lewis acid sites, therefore, carbon formation on CuNi and its oxidation by activated CO 2 are balanced 19. 53–56 The weakened interaction between the CuNi alloy and Al 2 O 3 by zirconia coating, however, leads to the more evident sintering of the metal NPs after 50 h reaction, with the particle size of 40–50 nm (inset of Figure 3 A).…”

Section: Resultsmentioning

confidence: 99%

The Key Points of Highly Stable Catalysts for Methane Reforming with Carbon Dioxide

Liu

Guan

et al. 2013

ChemCatChem

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Stable catalysis performance in long‐term operation is crucial for the wide‐scale industrialization of catalytic processes. The degradation of catalysts is a considerable problem for methane reforming with carbon dioxide, owing to carbon deposition on active sites and/or catalytic supports, and sintering of active components at high temperatures. With base metals and a modified alumina support, the present work has developed highly stable catalysts that operate free of coke formation and sintering of active components. Firstly, homogeneous copper‐nickel alloy nanoparticles (NPs), which have never previously been used for this purpose, were produced and then supported as catalytic centers onto alumina. The CuNi alloy catalyst with a Ni to Cu ratio of unity totally prohibits carbon deposition on active centers, while maintaining high activity for the reforming reaction. Second, the modification of alumina by coating with zirconia before supporting the CuNi alloy, drastically inhibits coke formation on the support, prevents the reaction of Cu in the alloy with alumina at high temperatures, and, therefore, promotes the stability of active alloy NPs. Additionally, after supporting the CuNi alloy NPs on zirconia‐coated alumina, the catalyst was coated with a thinner layer of zirconia to protect the CuNi NPs from sintering, while maintaining high activity. This state‐of‐the‐art catalyst is shown to be highly stable for methane reforming with carbon dioxide at high temperatures and the deactivation constant is calculated to be close to zero in a long‐term operation, even at extremely high space velocity of 120 000 mL g−1 h−1. The results are practically important to develop robust, as well as high performance, catalysts for the relevant reactions.

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Section: Resultsmentioning

confidence: 99%

The Key Points of Highly Stable Catalysts for Methane Reforming with Carbon Dioxide

Liu

Guan

et al. 2013

ChemCatChem

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“…Converting these greenhouse gases into clean energy is one of the most important challenges facing the world. 6,7 Therefore, it is critical to develop Ni-based catalysts with better stability. 4,5 Although considerable efforts have been devoted to this technology in the last few decades, full industrial application has still not been realized.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a SiO₂ nanofibre confined Ni catalyst by electrospinning for the CO₂ reforming of methane

et al. 2015

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A silica (SiO 2 ) nanofibre confined nickel (Ni) catalyst was successfully synthesized by the electrospinning technique and was then systematically characterized with thermogravimetric/differential thermal analysis (TG/DTA), X-ray photoelectron spectroscopy (XPS), N 2 sorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution-transmission electron microscopy (HR-TEM), temperatureprogrammed oxidation (O 2 -TPO), temperature-programmed reduction (H 2 -TPR) and temperatureprogrammed desorption (CO 2 -TPD) measurements. In the electrospinning synthesized Ni/SiO 2 catalyst, most of the Ni nanoparticles were confined inside SiO 2 nanofibers with an average particle size of 8.1 nm.Compared with the Ni/SiO 2 catalyst conventionally prepared via the incipient impregnation method using commercial SiO 2 powder as the support, the electrospun Ni/SiO 2 catalyst exhibited improved metal dispersion and enhanced metal-support interaction, leading to slightly higher activity and much better stability in the carbon dioxide (CO 2 ) reforming of methane. Carbon deposition, rather than metal sintering, is identified as the main cause for the deactivation of the Ni/SiO 2 catalyst under current conditions. The present work demonstrates that electrospinning is a potential technique for the fabrication of nanoconfined catalysts with superior catalytic performance and macro-scale handling properties.

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“…As temperature increases, the oxygen mobility is enhanced and lattice oxygen also can be activated to involve the reaction. 13,23 This negatively influenced the H 2 yield and resulted in a H 2 /CO ratio well below the thermodynamically predicted values of 1.0. As observed in Fig.…”

Section: Catalytic Performancementioning

confidence: 97%

“…[3][4][5] Syngas can be used as fuel or an intermediate in many industrial processes for chemical synthesis. 8,[13][14][15][16] However, such severe operating temperatures result in a serious catalytic deactivation by sintering of both metallic catalysts and supports. [6][7][8][9] Due to the strongly endothermic feature of the CRM reaction (CH 4 + CO 2 → 2CO + 2H 2 , △H 298 = 247 kJ/mol), the reaction occurs at the elevated temperature in the range of 500 ~ 900 °C, which is required to reach high conversion levels of the reactants.…”

Section: Introductionmentioning

confidence: 99%

Pt/porous nanorods of ceria as efficient high temperature catalysts with remarkable catalytic stability for carbon dioxide reforming of methane

Zhang

Gao

et al. 2015

J. Mater. Chem. A

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† Footnotes relating to the title and/or authors should appear here. Electronic Supplementary Information (ESI) available: [The synthesis procedure of CeO2 nanostructures, characterization, and the thermal stability evaluation characterized. The XRD patterns and XPS spectra of the Pt 4f for Pt/CeO2]. See Porous nanorods of ceria (PN-Ceria) with a large oxygen storage capacity and a high concentration of oxygen vacancies exhibited better thermal stability compared to other nanocerias. No obvious structural deconstruction of PN-Ceria was observed when the material was annealed at 800°C. As the support of metal nanocatalysts, Pt exhibited a high dispersion on PN-Ceria and presented a high activity and catalytic stability for carbon dioxide reforming of methane (CRM) reaction at a high temperature of 800 °C. Catalytic activity of Pt/PN-Ceria catalysts in terms of methane conversion was only slightly decreased from 77.3 % to 74.2 % with a slow carbon deposition of 0.1 mg coke · g cat -1 · h -1 after 72 hours CRM reaction at 800 °C. In contrast, a large decay in methane conversion (16.2 %) was observed for Pt/nonporous nanorods of ceria at the same reaction conditions. The high and robust catalytic activity of Pt/PN-Ceria catalysts can be ascribed to the unique physicochemical properties of PN-Ceria by preventing the sintering of Pt nanocatalysts into big particles and the formation of coke at rigid reaction conditions. Hence, more accessible active sites of Pt/PN-Ceria catalysts are provided for the CRM. Besides, the high concentration of oxygen vacancy and fast mobility of lattice oxygen of PN-Ceria also benefited the catalytic activity, stability and anti-coke deposition.Porous nanorods of CeO 2 (PN-Ceria) with a large surface area, a high oxygen storage capacity and remarkable thermal stability exhibit potentials as supports for metal catalysts.Combining their intrinsic physiochemical properties, the high catalytic activity, long-term stability and effectively suppressed carbon deposition of Pt/PN-Ceria catalysts have been demonstrated by carbon dioxide reforming of methane reaction at 800 ºC.

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One-Pot Synthesis of Supported, Nanocrystalline Nickel Manganese Oxide for Dry Reforming of Methane

Cited by 75 publications

References 34 publications

The Key Points of Highly Stable Catalysts for Methane Reforming with Carbon Dioxide

The Key Points of Highly Stable Catalysts for Methane Reforming with Carbon Dioxide

Synthesis of a SiO₂ nanofibre confined Ni catalyst by electrospinning for the CO₂ reforming of methane

Pt/porous nanorods of ceria as efficient high temperature catalysts with remarkable catalytic stability for carbon dioxide reforming of methane

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One-Pot Synthesis of Supported, Nanocrystalline Nickel Manganese Oxide for Dry Reforming of Methane

Cited by 75 publications

References 34 publications

The Key Points of Highly Stable Catalysts for Methane Reforming with Carbon Dioxide

The Key Points of Highly Stable Catalysts for Methane Reforming with Carbon Dioxide

Synthesis of a SiO2 nanofibre confined Ni catalyst by electrospinning for the CO2 reforming of methane

Pt/porous nanorods of ceria as efficient high temperature catalysts with remarkable catalytic stability for carbon dioxide reforming of methane

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Synthesis of a SiO₂ nanofibre confined Ni catalyst by electrospinning for the CO₂ reforming of methane