Effect of the Proximity of Pt to Ce or Ba in Pt/Ba/CeO2 Catalysts on NO x Storage–Reduction Performance

Büchel, Robert; Strobel, Reto; Baiker, Alfons; Pratsinis, Sotiris E.

doi:10.1007/s11244-009-9330-1

Cited by 19 publications

(13 citation statements)

References 17 publications

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“…BaCO 3 ) or on both components 123. This promising concept was later also used successfully for the synthesis of Pt/K/Al 2 O 3 127 and Pt/Ba/CeO 2 NSR catalysts128 (Table 2, entries 23, 24), where the active Pt was deposited preferentially on the storage component (K and Ba) or the support (Al 2 O 3 , CeO 2 ). This control of the spatial distribution of particular components adds another powerful facet to the flame synthesis of complex catalyst materials and greatly extends the scope of catalysts which can be prepared by flame aerosol technology.…”

Section: Flame Synthesis Of Other Mixed Metal Oxidesmentioning

confidence: 96%

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: 96%

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

2011

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“…1-propanol [148] 2-ethylhexanoic acid [147] acetic acid butyric acid Ethanol [148] hexanoic acid [147] Methanol [148] methanol:propionic acid=1:1; ethanol:propionic acid=1:1; 1-propanol:propionic acid=1:1; propionic acid/1-octanol; propionic acid/1-pentanol [148] octanoic acid [147] propionic acid [135]; [146]; [147] ; [151]; [359] propionic acid:n-propanol:water=5:4:1 [149]; [150] water/niric acid/citric acid [360] Lanthanum isopropoxide [134] Dimethylformamide [108] Ethanol [148]; [193] Methanol [148] methanol:propionic acid=1:1; ethanol:propionic acid=1:1; 1-propanol:propionic acid=1:1; propionic acid/1-octanol; propionic acid/1-pentanol [ [163]; [164] diethylene glycol monobutyl ether:2-ethylhexanoic acid=1:1 [89] toluene: 2-ethyl hexanoic acid=1:1 [226] Xylene [162]; [204]; [205] Cerium(III) acetate hydrate 2-ethylhexanoic acid [75] [Ce(CH3CO2)3•xH2O] 2-ethylhexanoic acid/toluene [75] acetic acid [42] acetic acid/iso-octane:2-butanol=4:1 lauric:acetic acid=1:1 [202] propanoic acid [359] Cerium(III) nitrate(+6H2O) 150/96(+6H 2O) ethanol [144] ethanol [74] ethanol with urea [192] methanol [230] Water [372] water/niric acid/citric acid [360] Cerium(III) propionate 120 propi...…”

Section: -170mentioning

confidence: 99%

Flame aerosol synthesis of nanostructured materials and functional devices: Processing, modeling, and diagnostics

Ren

Biswas

et al. 2016

Progress in Energy and Combustion Science

290

154

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Manufacturing of nanostructured materials and functional devices offers many exciting opportunities for scientists and engineers to contribute substantially in renewable energy utilization, environmental compliance, and product development. In the past two decades, gas-phase flame synthesis has not only proved to be one of the most scalable and economical technologies for producing well-controlled nanostructured materials, including single metal-oxide, mixed-oxide nanocomposite, and carbon nanostructures, but also has been recognized as a new low-cost fabrication method of nano-devices. In this paper, we focus our review mainly on the recent trends in specific applications of flame aerosol synthesis in the last decade, e.g., usage of a substrate in stagnation geometry with controlled particle temperature-time history, application of external fields to control particle characteristics, development of advanced spray technique for doping synthesis of nanocomposites of multicomponent metal oxides or carbon-metal oxides, and fabrication of nanomaterial-based functional devices. For the possibility to improve the design and operation of flame aerosol reactors, in situ optical diagnostics for either gas phase or particle phase in flame field, along with multi-scale modeling and simulation employing gas-phase chemistry, population balance method, molecular dynamics, and nanoscale particle dynamics are summarized.

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“…Mono- and bimetallic alumina-supported Rh and Pt catalysts containing BaCO 3 as storage component were prepared using a two-nozzle FSP [27] unit with a two-nozzle angle of 160° to ensure the preferential deposition of noble metals [29]. Each nozzle used a premixed CH 4 /O 2 flame at a volume ratio of 1/2 to ignite and sustain the spray [37].…”

Section: Methodsmentioning

confidence: 99%

“…The as-formed BaCO 3 is finely dispersed on the support and can decompose to BaO and CO 2 below 600 °C [28]. Additionally, the two-nozzle FSP allows preferential deposition of noble metals on the storage or support components [29]. Also bimetallic Pt/Pd clusters were produced with FSP [30].…”

Section: Introductionmentioning

confidence: 99%

Mono- and bimetallic Rh and Pt NSR-catalysts prepared by controlled deposition of noble metals on support or storage component

Büchel

Pratsinis

Baiker

2012

Applied Catalysis B: Environmental

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Mono- and bimetallic Rh and Pt based NO storage-reduction (NSR) catalysts, where the noble metals were deposited on the AlO support or BaCO storage component, have been prepared using a twin flame spray pyrolysis setup. The catalysts were characterized by nitrogen adsorption, CO chemisorption combined with diffuse reflectance infrared Fourier transform spectroscopy, X-ray diffraction, and scanning transmission electron microscopy combined with energy dispersive X-ray spectroscopy. The NSR performance of the catalysts was investigated by fuel lean/rich cycling in the absence and presence of SO (25 ppm) as well as after H desulfation at 750 °C. The performance increased when Rh was located on BaCO enabling good catalyst regeneration during the fuel rich phase. Best performance was observed for bimetallic catalysts where the noble metals were separated, with Pt on AlO and Rh on BaCO. The Rh-containing catalysts generally showed much higher tolerance to SO during fuel rich conditions and lost only little activity during thermal aging at 750 °C.

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Effect of the Proximity of Pt to Ce or Ba in Pt/Ba/CeO2 Catalysts on NO x Storage–Reduction Performance

Cited by 19 publications

References 17 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

Flame aerosol synthesis of nanostructured materials and functional devices: Processing, modeling, and diagnostics

Mono- and bimetallic Rh and Pt NSR-catalysts prepared by controlled deposition of noble metals on support or storage component

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