Selektivhydrierung von Citral in organischem Lösungsmittel, in ionischer Flüssigkeit und in Substanz

Steffan, Martin; Lucas, Martin; Brandner, Armin; Claus, Peter; Wollny, Mathis; Oldenburg, Nils

doi:10.1002/cite.200600034

Cited by 8 publications

(2 citation statements)

References 33 publications

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“…to citronellal over Pd catalysts through the tuning of the reaction conditions [12][13][14] and the selection of different supports, including Al 2 O 3 , zeolite, CaCO 3 , TiO 2 , and sepiolite. [15][16][17][18] However, the selectivities to the desired products over these catalysts are not promising, likely because of the poor selectivity of Pd for the hydrogenation of C=C and C=O.…”

Section: Introductionmentioning

confidence: 98%

Room‐Temperature Hydrogenation of Citral Catalyzed by Palladium–Silver Nanocrystals Supported on SnO₂

et al. 2015

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We have developed two strategies to optimize Pd catalysts. On one hand, Ag was introduced into Pd and then they were applied to the selective hydrogenation of citral under mild conditions. The addition of metallic Ag could tune the selectivity of Pd and made it suitable for the selective hydrogenation of the conjugated double bond. The selectivity of citronellal increased from 0 (for Pd/C and Pd 0.7 Ag 0.3 /C) to 96 % (for Pd 0.4 Ag 0.6 /C) as the Ag content increased. On the other hand, the addition of SnO 2 made the Pd catalysts more in-

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Section: Introductionmentioning

confidence: 98%

Room‐Temperature Hydrogenation of Citral Catalyzed by Palladium–Silver Nanocrystals Supported on SnO₂

et al. 2015

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“…However, silver can also be used as a catalyst for reduction reactions, for example selective hydrogenation of unsaturated aldehydes such as acrolein and crotonaldehyde [14][15][16] or citral [17,18]. Silver catalysts favor the formation of the industrially relevant unsaturated alcohols, whereas mainly saturated aldehydes are formed on conventional hydrogenation catalysts such as Pt/SiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Activation of dihydrogen on supported and unsupported silver catalysts

Hohmeyer

Kondratenko

Bron

et al. 2010

Journal of Catalysis

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The activation of dihydrogen on silica, silver, and silica-supported silver (9 wt% Ag) was investigated. Both, silica and silver are individually able to dissociate dihydrogen. Silanol groups on silica undergo H→D exchange at 393 K in D2 as detected by IR spectroscopy. HD is observed in temporal analysis of products (TAP) experiments when H2 and D2 are sequentially pulsed on silver at 673 K; even when the time delay between the isotopes is 4 s, HD is formed, indicating that long-lived surface hydrogen species are present. Differential scanning calorimetry (DSC) shows that the activation of dihydrogen is an activated process: heat signals evoked through H2 pulses on Ag/SiO2 grow with increasing temperature (373523 K). Nonetheless, the presence of silver on the silica surface accelerates the Si-OH→Si-OD exchange. Investigation of the exchange kinetics on Ag/SiO2 shows that diffusion processes of activated hydrogen species are rate-determining at higher temperatures ( 373 K), when activation of D2 on silver becomes facile. Indications of diffusion limitation are observed already at 313 K on Pt/SiO2. TAP and DSC measurements show that H2 is more readily activated on silver that has been treated in O2 at 673 K followed by reduction in H2 at 673 K. Morphological changes induced to the silver surfaces or (sub)surface oxygen species are presumed responsible for this effect

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Current Trends in Ionic Liquid Research

Stark

Wild

Ramzan

et al. 2013

Product Design and Engineering

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Selektivhydrierung von Citral in organischem Lösungsmittel, in ionischer Flüssigkeit und in Substanz

Cited by 8 publications

References 33 publications

Room‐Temperature Hydrogenation of Citral Catalyzed by Palladium–Silver Nanocrystals Supported on SnO₂

Room‐Temperature Hydrogenation of Citral Catalyzed by Palladium–Silver Nanocrystals Supported on SnO₂

Activation of dihydrogen on supported and unsupported silver catalysts

Current Trends in Ionic Liquid Research

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Selektivhydrierung von Citral in organischem Lösungsmittel, in ionischer Flüssigkeit und in Substanz

Cited by 8 publications

References 33 publications

Room‐Temperature Hydrogenation of Citral Catalyzed by Palladium–Silver Nanocrystals Supported on SnO2

Room‐Temperature Hydrogenation of Citral Catalyzed by Palladium–Silver Nanocrystals Supported on SnO2

Activation of dihydrogen on supported and unsupported silver catalysts

Current Trends in Ionic Liquid Research

Contact Info

Product

Resources

About

Room‐Temperature Hydrogenation of Citral Catalyzed by Palladium–Silver Nanocrystals Supported on SnO₂

Room‐Temperature Hydrogenation of Citral Catalyzed by Palladium–Silver Nanocrystals Supported on SnO₂