Highly active Cu-based catalysts on carbon nanofibers for isopropanol dehydrogenation

Kvande, Ingvar; Chen, De; Rønning, Magnus; Venvik, Hilde J.; Holmén, Anders

doi:10.1016/j.cattod.2004.10.027

Cited by 27 publications

(14 citation statements)

References 12 publications

(23 reference statements)

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“…Thus, from XRD alone, the passivation layer appears insignificant. Kvande et al [44] identified a crystalline Cu 2 O phase in addition to metallic copper by XRD after passivation of a reduced Cu/CNF catalyst in O 2 /He, indicating a significant degree of bulk oxidation.…”

Section: Copper Catalystsmentioning

confidence: 98%

Remarks on the passivation of reduced Cu-, Ni-, Fe-, Co-based catalysts

Huber

Lögdberg

et al. 2006

Catal Lett

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Catalysts containing metals such as Cu, Ni, Fe, Co in their reduced state are often subjected to passivation procedures prior to characterization. Passivation with N 2 O or O 2 to create a protective oxide layer also results in a certain degree of sub-surface oxidation. The heat released during oxidation is a critical parameter. The extent of bulk oxidation depends on the type of oxidant as well as on the size of the metal particles, as shown for copper catalysts. The final, meta-stable passivation layer requires a certain thickness to sustain exposure to ambient atmosphere. The encapsulation of metal particles in carbon is an efficient method for preserving the metallic state, as demonstrated for metallic nickel and iron with carbon nanofibers. The use of passivated samples for characterization of the active, i.e., reduced, catalyst has limited value.

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Section: Copper Catalystsmentioning

confidence: 98%

Remarks on the passivation of reduced Cu-, Ni-, Fe-, Co-based catalysts

Huber

Lögdberg

et al. 2006

Catal Lett

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“…Basic sites may interact with Cu sites via migration of hydrogen atoms. [165] The conversion of cyclohexanol [39,142,166,167] or of 2-propanol [168][169][170][171][172][173][174][175] allows the characterization of the acid-base surface properties of the oxides. The dehydration of alcohol leading to alkene would be catalyzed by the acid centers, whereas its dehydrogenation leading to ketone would be catalyzed both by acid and basic sites.…”

Section: Dehydrogenation Of Alcoholsmentioning

confidence: 99%

“…The presence of CeO 2 enhanced the reduction and dispersion of Cu. [171] For a Au/CeO 2 catalyst, the good oxidation performances were explained by a combination of the oxidation capability of gold atoms with the redox properties of the ceria phase. [173] In fact, the dehydrogenation reaction required redox sites, rather basic sites.…”

Section: Dehydrogenation Of Alcoholsmentioning

confidence: 99%

Ceria‐Based Solid Catalysts for Organic Chemistry

Vivier¹,

Duprez²

2010

ChemSusChem

357

244

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Ceria has been the subject of thorough investigations, mainly because of its use as an active component of catalytic converters for the treatment of exhaust gases. However, ceria‐based catalysts have also been developed for different applications in organic chemistry. The redox and acid–base properties of ceria, either alone or in the presence of transition metals, are important parameters that allow to activate complex organic molecules and to selectively orient their transformation. Pure ceria is used in several organic reactions, such as the dehydration of alcohols, the alkylation of aromatic compounds, ketone formation, and aldolization, and in redox reactions. Ceria‐supported metal catalysts allow the hydrogenation of many unsaturated compounds. They can also be used for coupling or ring‐opening reactions. Cerium atoms can be added as dopants to catalytic system or impregnated onto zeolites and mesoporous catalyst materials to improve their performances. This Review demonstrates that the exceptional surface (and sometimes bulk) properties of ceria make cerium‐based catalysts very effective for a broad range of organic reactions.

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“…The generation of ordered carbonaceous structures such as fullerenes, nanotubes and nanofibers is a burgeoning area of research in catalysis [1][2][3]. The properties of carbon nanotubes (CNTs) and carbon nanofibers (CNFs) have attracted considerable interest from both scientific and technological point of view: catalyst supports [4], polymer reinforcement agents [5], fuel cell electrodes [6], adsorbents [7], energy storage [8], etc.…”

Section: Introductionmentioning

confidence: 99%