Catalytic and spectroscopic studies of Ag1.2V3CeyO8+x catalysts for oxidation of toluene

Onion-type multilamellar vesicles are made of concentric bilayers of organic surfactant and are mainly known for their potential applications in biotechnology. They can be used as microreactors for the spontaneous and controlled production of metal nanoparticles. This process does not require any thermal treatment and, hence, it is also attractive for material sciences such as heterogeneous catalysis. In this paper, silver-nanoparticle-based catalysts are prepared by transferring onion-grown silver nanoparticles onto inorganic supports. The resulting materials are active in the total oxidation of benzene, attesting that this novel bio-inspired concept is promising in inorganic catalysis.

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“…Silver has indeed already been reported as an efficient dope for V-based oxidation catalysts. [33][34][35][36]…”

Section: Accessibility Of the Transferred Nanoparticlesmentioning

confidence: 99%

A New Bio‐Inspired Route to Metal‐Nanoparticle‐Based Heterogeneous Catalysts

Debecker

Faure

Meyre

et al. 2008

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“…[37] Die Kombination der Fähigkeiten, Sauerstoff zu aktivieren und aktivierten Sauerstoff an trägerfixierte Partikel wie NiO weiterzugeben, macht CZ zu einer effektiven Komponente in difunktionellen Oxidationskatalysatoren. [38,39] Abgesehen von den Redoxeigenschaften von NiO/CZ gab In-situ-XANES auch Aufschlüsse über die Wechselwirkungen von Wasserdampf mit NiO-Clustern. Diese Wechselwirkungen sind wichtig,d adieB ildung von Metallhydroxidclustern in früheren Studien die kontinuierlich betriebene selektive Oxidation von Methan über CuO x und FeO x verhinderte.…”

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Produktion von Methanol und Ethanol aus Methan in einem einzigen Reaktor mit einem Nickeloxid auf Ceroxid‐Zirconiumoxid‐Katalysator

et al. 2017

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Die Umwandlung von Methan in Alkohole unter milden Reaktionsbedingungen ist eine vielversprechende Technologie fürdie Nutzung abgelegener Methanvorkommen. Die flüssigen Alkohole kçnnen in Pipelines transportiert und zu wertvolleren Chemikalien weiterverarbeitet werden. Hier wird gezeigt, dass ein Katalysator aus Nickeloxidpartikeln auf einen Ceroxid-Zirconiumoxid-Träger (NiO/CZ) Methan in einem einzigen, kontinuierlichb etriebenen Reaktor zu Methanol und Ethanol umwandeln kann. Die Reaktion geschieht bei milden Temperaturen (723 K) mit O 2 als Oxidationsmittel. Die Produktion von Alkoholen erfordert die Gegenwart von Wasserdampf,u md ie vollständige Oxidation zu CO 2 zu unterdrücken. Die Synergie zwischen Lewis-aciden NiO-Partikeln und dem redoxaktiven Ceroxid-Zirconiumoxid-Träger ermçglicht die ungewçhnliche Reaktivitätd ieses Katalysators.

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“…Partial oxidation of toluene is an industrially important process, yielding products such as benzyl alcohol [6,7], benzaldehyde [8][9][10] and benzoic acid [11] over various catalysts, in all of which silver is an essential ingredient. However, it is not understood why silver is needed in these catalysts.…”

Section: Introductionmentioning

confidence: 99%

Long-range ordering of stable, surface-bound intermediates: RAIRS, TPRS and STM studies of toluene oxidation on Ag(110)

Guo

Alemozafar

Madix

2018

Catalysis, Structure & Reactivity

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There is long-term interest in catalyst poisoning due to the buildup of carbonaceous species on catalytic metal surfaces. These species are often derived from the reactants themselves in reactions parallel to the primary catalytic cycle. Generally, these species are believed to be randomly distributed on the surface, with locally high concentrations. Using scanning tunneling microscopy (STM), we have found that upon annealing to 400 K a stable intermediate formed by partial oxidation of toluene on Ag(110) forms highly ordered domains with a length scale well over 1000 Å, limited only by the size of surface terraces. Temperature-programmed reaction spectroscopy and STM suggest the intermediate to be adsorbed benzoate species, C 6 H 5 CHOO, which decomposes to carbon dioxide and benzene near 550 K when heated.

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Catalytic and spectroscopic studies of Ag1.2V3CeyO8+x catalysts for oxidation of toluene

Cited by 21 publications

References 19 publications

A New Bio‐Inspired Route to Metal‐Nanoparticle‐Based Heterogeneous Catalysts

A New Bio‐Inspired Route to Metal‐Nanoparticle‐Based Heterogeneous Catalysts

Produktion von Methanol und Ethanol aus Methan in einem einzigen Reaktor mit einem Nickeloxid auf Ceroxid‐Zirconiumoxid‐Katalysator

Long-range ordering of stable, surface-bound intermediates: RAIRS, TPRS and STM studies of toluene oxidation on Ag(110)

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