Crystalline ordered mesoporous Cu 0.25 Co 2.75 O 4  prepared with selected mesoporous silica templates and their performances as DeN 2 O catalysts

Franken, Tanja; Mani, Christian Mbaya; Palkovits, Regina

doi:10.1016/j.micromeso.2015.09.019

Cited by 7 publications

(2 citation statements)

References 18 publications

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“…[26][27][28] 29) Neue Trends zeigen sich vor allem in der Übertragung der regelmäßigen Porenstruktur geordneter mesoporöser Materialien auf andere Materialklassen wie Metalle, Karbide, Nitride und Kohlenstoffe. [30][31][32][33] Problematisch beim Optimieren von Stofftransport und Reaktion sind neben der Materialsynthese vor allem komplexe Reaktionen, etwa die Fischer-Tropsch-Synthese. Kombinierte Experimente mit geordneten Porenstrukturen und Einzeluntersuchungen zu Phänomenen wie der Wachsfüllung und der Simulation sollen hier Fortschritte erzielen.…”

Section: Modellierung Und Simulationunclassified

Trendbericht Technische Chemie

Etzold¹,

Nieken²,

Sauer³

et al. 2018

Nachr Chem

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Section: Modellierung Und Simulationunclassified

Trendbericht Technische Chemie

Etzold¹,

Nieken²,

Sauer³

et al. 2018

Nachr Chem

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“…Conversely, the hard templating route begins with an inorganic porous template that is subsequently filled with the precursor of interest, processed to generate the desired framework chemistry, and then the template is selectively removed . Hard templating generally provides more control over the structure especially for crystalline frameworks , but requires increased time and costs associated with the template synthesis and its subsequent removal. Soft templating is commonly thought to be more efficient, but there are issues associated with assembly with reactive species based on the relative size of the precursor particles to the template …”

Section: Introductionmentioning

confidence: 99%

Tuning Cooperative Assembly with Bottlebrush Block Co-polymers for Porous Metal Oxide Films Using Solvent Mixtures

et al. 2019

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Block copolymer templating enables the generation of well-defined pore sizes and geometries in a wide variety of frameworks, typically through evaporation-induced self-assembly (EISA). Here, we systematically modulate the solvent quality with mixtures of tetrahydrofuran–ethanol (THF–EtOH) to manipulate the unimer/micelle ratio in the precursor solution to explore how the associated solution structure influences the final pore morphology. A bottlebrush block copolymer (BBCP) with poly(ethylene oxide) and poly(t-butyl acrylate) side chains was used as the template for pore formation. Irrespective of the solvent composition, a bimodal pore size distribution was obtained with mesopores templated by small aggregates of the BBCP unimers (potentially low aggregation number micelles) and macropores templated by large self-assembled BBCP micelles. The morphology and pore characteristics of the metal oxide films were dependent on the THF–EtOH composition. Interestingly, an intermediate solvent composition where the volume of micelles is approximately half the volume of unimers (in the precursor solution) leads to the best ordering of micelle-templated pores and also the maximum porosity in the films. The micelle/unimer ratios in the precursor solutions do not correspond directly to the bimodal pore distribution in the metal oxide films, which we attribute to kinetically trapped assembly of the BBCP at a low THF content. The increased critical micelle concentration at high THF composition leads to changes in the unimer/micelle ratio during solvent evaporation. These results appear to be universal for a number of metal oxides (cobalt, magnesium, and zinc) with the porosity maximized at a THF/EtOH ratio of 3:1. These results suggest the potential for enhancements in the porosity of block copolymer-templated films by EISA methods through judicious solvent selection.

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Preparation and Application of Ordered Mesoporous Metal Oxide Catalytic Materials

Zhang

Tang

et al. 2019

Catal Surv Asia

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Crystalline ordered mesoporous Cu 0.25 Co 2.75 O 4 prepared with selected mesoporous silica templates and their performances as DeN 2 O catalysts

Cited by 7 publications

References 18 publications

Trendbericht Technische Chemie

Trendbericht Technische Chemie

Tuning Cooperative Assembly with Bottlebrush Block Co-polymers for Porous Metal Oxide Films Using Solvent Mixtures

Preparation and Application of Ordered Mesoporous Metal Oxide Catalytic Materials

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