Combinatorial synthesis and characterization of alkali metal doped oxides for diesel soot combustion

An, Hongmei; Kilroy, Caitlin; McGinn, Paul J.

doi:10.1016/j.cattod.2004.08.006

Cited by 79 publications

(39 citation statements)

References 30 publications

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“…[375] Automated thermogravimetric analysis (TGA) has been used to examine libraries of alkali-metal-doped mixed oxides for their relative activity to combust diesel soot. [376] The strong influence of alkali-metal ions on the activity of diesel soot combustion catalysts was also confirmed by studies by Olong et al [377] In this investigation, HTS was performed by ecIRT, and only selected hits were further characterized by TGA. In an interesting study on the HT search for low-temperature combustion catalysts for air pollutants, the authors noted a strong dependence of catalytic performance on the nature of the model pollutants used (dimethylamine DMA, benzene, and dimethylsulfide).…”

Section: Combinatorial Materials Researchmentioning

confidence: 53%

Combinatorial and High‐Throughput Materials Science

2007

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There is increasing acceptance of high-throughput technologies for the discovery, development, and optimization of materials and catalysts in industry. Over the years, the relative synchronous development of technologies for parallel synthesis and characterization has been accompanied by developments in associated software and information technologies. This Review aims to provide a comprehensive overview on the state of the art of the field by selected examples. Technologies developed to aid research on complex materials are covered as well as databases, design of experiment, data-mining technologies, modeling approaches, and evolutionary strategies for development. Different methods for parallel synthesis provide single sample libraries, gradient libraries for electronic or optical materials, similar to polymers and catalysts, and products produced through formulation strategies. Many examples illustrate the variety of isolated solutions and document the barely recognized variety of new methods for the synthesis and analysis of almost any material. The Review ends with a summary of success stories and statements on still-present problems and future tasks.

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Section: Combinatorial Materials Researchmentioning

confidence: 53%

Combinatorial and High‐Throughput Materials Science

2007

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“…This observation seems to be related with the higher dispersion of metal particles on KCu2/Al 2 O 3 . It is also related, with the fact that metal oxides can catalyse the oxidation of soot [19][20][21][22]. Finally, as it was above commented, the support acidity seems to explain the difference in the C 3 H 6 conversion [12].…”

Section: Overviewmentioning

confidence: 92%

Performance of potassium-promoted catalysts for NO x and soot removal from simulated diesel exhaust

Nejar

Illán-Gómez

2007

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In order to elucidate the effect of support in the catalytic performance, two selected potassium-promoted catalysts (K1Cu/beta and KCu2/Al 2 O 3 ) were tested for the simultaneous NO x /soot removal from a simulated diesel exhaust. For comparative purpose, the behaviour of a platinum catalyst (Pt/beta) was also studied. Isothermal experiments revealed that the potassium-promoted catalysts show a high activity for NO x /soot removal in the 350-450°C temperature range. In addition, the catalysts present the advantage that the main reaction products are N 2 and CO 2 . Among the catalysts tested, KCu2/Al 2 O 3 presents the best global performance at 450°C: the highest soot consumption rate, even higher than the platinum catalysts, and a high NO x reduction.

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“…It was also shown that structural promotion was more effective than the surface one. Details concerning alkali promotion can be found in [13]. Systematic investigations of perovskite K x La 1-x FeO 3 , spinels A 2x Cu 1-x Fe 2 O 4 and A 2x Co 1-x Fe 2 O 4 (where A is an alkali metal) led to the conclusion that the most effective promoter is potassium and the activity depends on the promoter concentration.…”

Section: Introductionmentioning

confidence: 99%

Strong Enhancement of deSoot Activity of Transition Metal Oxides by Alkali Doping: Additive Effects of Potassium and Nitric Oxide

et al. 2016

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A series of potassium-promoted spinels (Mn, Fe, Co) were prepared with various K ? promoter locations: on the surface (surface promotion) or in the bulk (formation of new layered and tunneled nanostructures via solid state reaction). All prepared samples were characterized by means of X-ray diffraction, Raman spectroscopy, X-ray fluorescence and N 2 -BET specific surface area analysis. Catalytic activity in soot combustion in different reaction conditions was investigated (tight contact, loose contact, loose contact with NO addition). It was shown that in all cases the nanostructuration is more effective than the surface promotion, with the layered structures of KCo 4 O 8 , KMn 4 O 8 being the most catalytically active phases, lowering the soot combustion down to 250°C. The difference in activity between tight and loose contacts can be bridged in the presence of NO due to its transformation into NO 2 , which acts as the oxygen carrier from the catalyst surface into soot particles, eliminating the soot-catalyst contact difference.

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Combinatorial synthesis and characterization of alkali metal doped oxides for diesel soot combustion

Cited by 79 publications

References 30 publications

Combinatorial and High‐Throughput Materials Science

Combinatorial and High‐Throughput Materials Science

Performance of potassium-promoted catalysts for NO x and soot removal from simulated diesel exhaust

Strong Enhancement of deSoot Activity of Transition Metal Oxides by Alkali Doping: Additive Effects of Potassium and Nitric Oxide

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