Journal ArticleDOI
Catalytic dry reforming of methane over high surface area ceria
TLDR
In this article, high surface area ceria (CeO 2) was synthesized by a surfactant-assisted approach, which has useful dry reforming activity for H 2 and CO production under solid oxide fuel cells (SOFCs) conditions.Abstract:
High surface area ceria (CeO 2 (HSA)), synthesized by a surfactant-assisted approach, was found to have useful dry reforming activity for H 2 and CO production under solid oxide fuel cells (SOFCs) conditions. The catalyst provides significantly higher reforming reactivity and excellent resistance toward carbon deposition compared to Ni/Al 2 O 3 and conventional low surface area ceria (CeO 2 (LSA)) under dry reforming conditions. These enhancements are due to the high redox property of CeO 2 (HSA). During the dry reforming process, the redox reactions between the gaseous components in the system and the lattice oxygen (O x ) take place on ceria surface. Among these reactions, the rapid redox reactions of carbon compounds such as CH 4 , and CO with lattice oxygen (CH 4 + O x → CO + H 2 + O x −1 and CO + O x = CO 2 + O x −1 ) can prevent the formation of carbon species from the methane decomposition and Boudard reactions even at low inlet carbon dioxide concentration. In particular, the dry reforming rate over CeO 2 (HSA) is proportional to the methane partial pressure and the operating temperature. Carbon dioxide presents weak positive impact on the methane conversion, whereas both carbon monoxide and hydrogen inhibit the reforming rate. The activation energies and reforming rates under the same methane concentration for CeO 2 toward the dry reforming are almost equal to the steam reforming as previously reported [1–4] . This result suggests the similar reaction mechanisms for both the steam reforming and the dry reforming over CeO 2 ; i.e., the dry reforming rate is governed by the slow reaction of adsorbed methane, or surface hydrocarbon species, with oxygen in CeO 2 , and a rapid gas–solid reaction between CO 2 and CeO 2 to replenish the oxygen.read more
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Preparation of nanocrystalline Zr, La and Mg-promoted 10% Ni/Ce0.95Mn0.05O2 catalysts for syngas production via dry reforming reaction
TL;DR: In this paper, the influence of the various promoters (Zr, La and Mg) on the physicochemical and catalytic characteristics of the 10% Ni/Ce0.95Mn0.05O2 solid solution catalyst were investigated in methane dry reforming at atmospheric pressure.
Journal ArticleDOI
Influence of the microstructure on the catalytic properties of SOFC anodes under dry reforming of methane
Andrea Lanzini,Cosimo Guerra,Pierluigi Leone,Massimo Santarelli,Federico Smeacetto,Sonia Lucia Fiorilli,Angela Gondolini,Elisa Mercadelli,Alessandra Sanson,Nigel P. Brandon +9 more
TL;DR: In this paper, the catalytic properties of different solid oxide fuel cell (SOFC) Ni-based anodes toward the dry reforming of CH4 were investigated in a tubular quartz micro-reactor, where a mass spectrometer was used to analyze the outlet gas composition and thus to evaluate the methane conversion rate.
Journal ArticleDOI
Catalytic Steam Methane Reforming Over Ir/Ce0.9Gd0.1O2–x: Resistance to Coke Formation and Sulfur Poisoning
TL;DR: In this article, the catalytic properties of Ir/Ce0.9Gd0.1O2-x (Ir/CGO) and CGO support in steam reforming of methane in the absence or presence of H2S (50 ppm) for further application in a solid oxide fuel cell (SOFC) working under methane at intermediate temperatures and integrating a gradual internal reforming concept.
Journal ArticleDOI
Dual-Bed Catalytic System for Direct Conversion of Methane to Liquid Hydrocarbons
TL;DR: In this paper, a dual-bed catalytic system was investigated to overcome the limitations and permit the direct conversion of natural gas to liquid hydrocarbons, and the results indicated that the optimum C5+ yield of 8.91% was attained at reaction temperature = 742 ÂoC, CH4/O2 ratio = 9.7 and Ni loading = 0.67 wt%.
Journal ArticleDOI
Effect of the support composition on catalytic and physicochemical properties of Ni catalysts in oxy-steam reforming of methane
Pawel Mierczynski,Magdalena Mosinska,Natalia Stepinska,Karolina Chalupka,Magdalena Nowosielska,Waldemar Maniukiewicz,Jacek Rogowski,Nirmal Goswami,Krasimir Vasilev,Malgorzata I. Szynkowska +9 more
TL;DR: In this paper, the physicochemical properties of the Ni catalysts were extensively studied using techniques such as temperature programmed reduction (TPR-H2), Temperature Programmed Desorption of Ammonia (TPD-NH3), Brunauer Emmett Teller Method (BET), X-ray Diffraction studies (XRD), Thermal Analysis coupled with mass Spectrometry (TG-DTA-MS), Time of Flight Secondary Ion Mass Spectrometer (ToF-SIMS), XPS and Scanning Electron Microscope with EDX detector (S
References
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Journal ArticleDOI
Ordered mesoporous molecular sieves synthesized by a liquid-crystal template mechanism
TL;DR: In this paper, the synthesis of mesoporous inorganic solids from calcination of aluminosilicate gels in the presence of surfactants is described, in which the silicate material forms inorganic walls between ordered surfactant micelles.
Journal ArticleDOI
Generalized synthesis of periodic surfactant/inorganic composite materials
Qisheng Huo,David I. Margolese,Ulrike Ciesla,Pingyun Feng,Thurman E. Gier,Peter Sieger,R. Leon,Pierre Petroff,Ferdi Schüth,Ferdi Schüth,Galen D. Stucky +10 more
TL;DR: In this article, a generalized approach to the synthesis of periodic mesophases of metal oxides and cationic or anionic surfactants under a range of pH conditions is presented.
Journal ArticleDOI
A neutral templating route to mesoporous molecular sieves.
TL;DR: A neutral templating route for preparing mesoporous molecular sieves is demonstrated based on hydrogen-bonding interactions and self-assembly between neutral primary amine micelles (S�) and neutral inorganic precursors (l�).
Journal ArticleDOI
Organization of Organic Molecules with Inorganic Molecular Species into Nanocomposite Biphase Arrays
Qisheng Huo,D. Margolese,Ulrike Ciesla,D. Demuth,D. Demuth,Pingyun Feng,Thurman E. Gier,Peter Sieger,A. Firouzi,Bradley F. Chmelka,Ferdi Schüth,Ferdi Schüth,Galen D. Stucky +12 more
TL;DR: In this article, the organization of cationic or anionic organic and inorganic molecular species to produce three-dimensional periodic biphase arrays is described, which uses cooperative nucleation of molecular inorganic solution species with surfactant molecules and their assembly a t low temperatures into liquid-crystal-like arrays.
Journal ArticleDOI
The multiple roles for catalysis in the production of H2
TL;DR: A review of the use of catalysis for the current and future production of H2 can be found in this article, where a number of different, largely catalytic approaches for producing H2 are described.