Flame pyrolysis: A preparation route for ultrafine powders of metastable?-SrMnO3 and NiMn2O4

Kriegel, R.; Töpfer, J.; Preuss, Núbia Liziani; Grimm, S.; Böer, Johannes

doi:10.1007/bf00633530

Cited by 23 publications

(16 citation statements)

References 6 publications

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“…Beside the vanadia‐based catalysts focused in the first part of this review, there are a number of other mixed oxide‐based catalysts that have been prepared in flames, including perovskites78–79, 85–86, which have already been covered in an earlier review8 and are therefore not discussed here. Progress in the flame synthesis of supported noble metal (e.g.…”

Section: Flame Synthesis Of Other Mixed Metal Oxidesmentioning

confidence: 99%

“…Spinel‐type oxidation catalysts: Spinels find use in many applications and are especially interesting for catalysis due to their (electro)chemical properties. NiMn 2 O 4 spinels86 were made in 1994 by flame assisted spray pyrolysis (FASP). By combustion of Ni acetylacetonate and Mn acetylacetonate dissolved in toluene high surface area materials (170 m 2 g −1 ) were achieved.…”

Section: Flame Synthesis Of Other Mixed Metal Oxidesmentioning

confidence: 99%

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Flame Aerosol Synthesis of Metal Oxide Catalysts with Unprecedented Structural and Catalytic Properties

2011

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In the past two decades flame aerosol synthesis of novel materials has experienced significant growth in both industry and academia. Recent research is focused on the development of new materials in the nanosized range to be used in various applications, such as catalysts, gas sensors, pigments, and batteries. Several studies indicate that this scalable synthesis method can result in novel and metastable phases of mixed metal oxides of high purity, which may not be easy accessible by conventional wet‐ or solid‐state processes. Especially for catalytic applications this synthesis method is emerging as an attractive fast and single‐step production route for high surface area materials, often with unprecedented structural and catalytic properties. The large variety of possible organometallic precursors especially for the liquid‐fed aerosol flame synthesis makes this technique very versatile for catalyst synthesis. Using the example of the widely used vanadia‐based mixed oxide catalysts, we analyze the structural and catalytic properties of flame‐derived catalysts and compare them to corresponding catalysts prepared by classical wet‐chemistry methods. The often unique structural properties along with their control at proper synthesis conditions and their influence on catalyst performance in selected reactions are discussed. Subsequently, we give an overview of other recent flame‐made mixed metal oxide based catalysts and make an attempt to assess the potential and limitations of flame synthesis for the preparation of catalytic mixed metal oxide materials, and finally we identify future challenges in research.

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Section: Flame Synthesis Of Other Mixed Metal Oxidesmentioning

confidence: 99%

Section: Flame Synthesis Of Other Mixed Metal Oxidesmentioning

confidence: 99%

Flame Aerosol Synthesis of Metal Oxide Catalysts with Unprecedented Structural and Catalytic Properties

2011

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“…Aggregated ultrafine spinel powders of NiMn 2 O 4 and SrMnO 3 were obtained by dissolving the carbonate precursors in dilute acetic acid and spraying this solution into a hydrogen/oxygen diffusion flame [59]. The successful preparation of nano-grained ternary oxides in the flame process similar to established methods for titania and silica was a major step towards the aerosol-based, large-scale production of functional nanoparticles.…”

Section: Vapor-flame-supported Spray Pyrolysis (Vfsp)mentioning

confidence: 99%

“…The successful preparation of nano-grained ternary oxides in the flame process similar to established methods for titania and silica was a major step towards the aerosol-based, large-scale production of functional nanoparticles. Kriegel et al [59] further demonstrated that the prepared β-SrMnO 3 powders were catalytically active (temperature-dependent CO 2 formation from methane) and had higher conversion rates compared with powders derived using a conventional solid-state reaction. This performance was mainly attributed to the high specific surface area in the absence of micropores of the aerosol-derived powder.…”

Section: Vapor-flame-supported Spray Pyrolysis (Vfsp)mentioning

confidence: 99%

Liquid-fed Aerosol Reactors for One-step Synthesis of Nano-structured Particles

Mädler

2004

KONA

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Aerosol technology is the key process for large-scale production of nano-structured materials such as carbon black, titania and silica. The understanding of gas-phase synthesis was transferred successfully from classic vapor-fed f lames to liquid-fed aerosol reactors, enabling now also the one-step production of demanding and highly functional products. Such aerosol-derived nano-structured metal oxides, mixed metal oxides, and metals on metal oxides find application in the fields of catalysis, sensors, fillers, and electronics, and have advanced the research and development of these reactors in recent years. The four main spray methods include spray pyrolysis in a tubular reactor (SP), spray pyrolysis using a vapor f lame reactor (VFSP), the emulsion combustion method (ECM) and f lame spray pyrolysis (FSP). These methods are discussed and key concepts are compared such as the energy source driving the solvent/fuel evaporation and precursor reaction, final particle formation. Advances in fundamental understanding, scaling and simulation are highlighted. Specific strategies for the production of homogeneous products are presented in context with existing methods and specific applications. Finally, research needs are discussed with respect to new f lame-made materials, instrumental strategies for their production and process optimization, including diagnostic techniques and process simulation.

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“…Still one of the most complicated classes of mixed metal oxides are perovskites for catalysis or for cathode (Gd-doped ceria (Jud et al 2006), Sm 0.5 Sr 0.5 CoO 3−xSm 0.1 Ce 0.9 O 3−x (Liu et al 2004)) and anode materials in solid oxide fuel cells. The high thermal stability of flame derived perovskites such as NiMnO 3 (Kriegel et al 1994) and BaTiO 3 (Brewster and Kodas 1996) enabled maintaining a very high catalytic activity and deactivation-resistance at harsher conditions than conventional materials (cold preparation and sintering). Additionally, mixed oxides have been investigated for electroceramics.…”

Section: Mixed Oxides and Oxide Glassesmentioning

confidence: 99%

Chemical Aerosol Engineering as a Novel Tool for Material Science: From Oxides to Salt and Metal Nanoparticles

Athanassiou

Grass

Stark

2010

Aerosol Science and Technology

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Aerosol nanotechnology has rapidly evolved in the past years. This fascinating technology has resulted in the development of functional nanomaterials providing novel solutions in industrial applications. The extensive research on the physical understanding of gas phase processes has strongly contributed to the present industrial use of single and mixed oxides and the design of industrial aerosol reactors. Recent advances have shown that chemical aerosol engineering can be established on the interface between classical aerosol science and chemical engineering. The emerging new methods give access to a much broader class of functional materials including salt and metal nanoparticles. The latter implies that aerosol production units can now be considered as chemical reactors. The incorporation of thermodynamic considerations and chemical kinetics in the modelling of gas phase processes will further boost the development of aerosol engineering and will provide deeper understanding of the fundamentals of particle formation mechanisms. This will ultimately enable access to new multicomponent materials with various structures or morphologies and the development of more sustainable, energy efficient gas phase processes.

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Flame pyrolysis: A preparation route for ultrafine powders of metastable?-SrMnO3 and NiMn2O4

Cited by 23 publications

References 6 publications

Flame Aerosol Synthesis of Metal Oxide Catalysts with Unprecedented Structural and Catalytic Properties

Flame Aerosol Synthesis of Metal Oxide Catalysts with Unprecedented Structural and Catalytic Properties

Liquid-fed Aerosol Reactors for One-step Synthesis of Nano-structured Particles

Chemical Aerosol Engineering as a Novel Tool for Material Science: From Oxides to Salt and Metal Nanoparticles

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