Selective Hydrogenation of Aromatic Aldehydes Using Precious Metal Catalysts on New High Surface-Area TiO2 Supports

Bankmann, M.; Brand, R.; Freund, Andreas; Tacke, Thomas

doi:10.1016/s0167-2991(08)63307-8

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…Table 2 shows the catalytic activity of Pt/MgAl 2 O 4 -0.5(D) over hydrogenation of benzaldehydes with different substituting groups. The turnover frequencies (TOFs) of the investigated The catalytic hydrogenation of benzaldehyde derivatives is believed to involve nucleophilic addition of the hydride ion produced by dissociative adsorption of H 2 on the surface of a metal catalyst [39,40]. Therefore, the hydrogenation of benzaldehyde derivatives is aided by the presence of electron withdrawing substituents on the phenyl ring, and whereas hydrogenation is hindered by electron donating substituents.…”

Section: Catalytic Hydrogenationmentioning

confidence: 99%

Catalytic hydrogenation of benzaldehydes over platinum nanoparticles immobilized on magnesium aluminate spinel under mild conditions

Han

Zhang

et al. 2010

Reac Kinet Mech Cat

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Platinum nanoparticles, synthesized via ethanol reduction of hexachloroplatinic acid in the presence of poly-(N-vinyl-2-pyrrolidone), were anchored on magnesium aluminate spinel using a colloidal deposition method. The samples were characterized using the following methods: transmission electron microscopy, powder X-ray diffraction, scanning electron microscopy, and energy dispersive X-ray spectroscopy. The results revealed that platinum nanoparticles, with an average diameter of 2.8 nm, are homogenously dispersed on the surface of the carrier. Under very mild conditions, supported Pt/MgAl 2 O 4 catalysts demonstrated excellent catalytic activity and high selectivity in the hydrogenation reaction of benzaldehydes to benzyl alcohols. The reaction kinetics for the catalytic hydrogenation of 3-phenoxybenzaldehyde to 3-phenoxybenzyl alcohol on a Pt/MgAl 2 O 4 catalyst can be described by equation r ¼ k Â c 1:44 Â p H 2 , and the apparent activation energy is 35.6 kJ mol -1 .

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Section: Catalytic Hydrogenationmentioning

confidence: 99%

Catalytic hydrogenation of benzaldehydes over platinum nanoparticles immobilized on magnesium aluminate spinel under mild conditions

Han

Zhang

et al. 2010

Reac Kinet Mech Cat

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“…Conversely, aromatic ketones are readily converted into the corresponding methylene derivatives over Pd catalysts in acidic medium. [26,27] Ionic liquids incorporating acid functional groups, for example, carboxylic acid groups, might be of particular relevance for application in hydrogenolysis reactions as these task-specific ionic liquids (TSILs) could be a worthwhile alternative for the generally added acid promoters required for the formation of the alkylbenzene products. Another benefit of ionic liquids is the straightforward isolation of the product by decantation, as ionic liquids can be selected that are miscible with the aromatic ketone substrates but immiscible with the alkylbenzene products, thus forming a biphasic system after reaction.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Hydrogenolysis of Aromatic Ketones in Mixed Choline–Betainium Ionic Liquids

et al. 2008

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The palladium-catalyzed hydrogenolysis of aromatic ketones to alkylbenzenes was studied in mixtures of ionic liquids to explore the promotional effect of these reaction media. Choline-based ionic liquids displayed complete miscibility with the aromatic ketone substrate at reaction temperature and a clear phase separation of the derived alkylbenzene product at room temperature. Selected ionic liquids were then assessed as reaction media in the hydrogenolysis of aromatic ketones over palladium catalysts. A binary mixture of choline and betainium bis(trifluoromethylsulfonyl)imide ionic liquids resulted in the highest conversion and selectivity values in the hydrogenolysis of acetophenone. At the end of the reaction, the immiscible alkylbenzene separates from the ionic liquid mixture and the pure product phase can be isolated by simple decantation. After optimization of the reaction conditions, high yields (>90 %) of alkylbenzene were obtained in all cases. The catalyst and the ionic liquid could be used at least three times without any loss of activity or selectivity.

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Selective Hydrogenation of Aromatic Aldehydes Using Precious Metal Catalysts on New High Surface-Area TiO2 Supports

Cited by 2 publications

References 5 publications

Catalytic hydrogenation of benzaldehydes over platinum nanoparticles immobilized on magnesium aluminate spinel under mild conditions

Catalytic hydrogenation of benzaldehydes over platinum nanoparticles immobilized on magnesium aluminate spinel under mild conditions

Catalytic Hydrogenolysis of Aromatic Ketones in Mixed Choline–Betainium Ionic Liquids

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