Ru-catalyzed hydrogenation of aromatic diamines: The effect of alkali metal salts

Kim, Hoon Sik; Seo, Sang Hyun; Lee, Hyunjoo; Lee, Sang Deuk; Kwon, Young Soo; Lee, Ik-Mo

doi:10.1016/s1381-1169(97)00246-x

Cited by 14 publications

(4 citation statements)

References 8 publications

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“…Also in this case, we propose that NB and AN form a hydrogen-bonded adduct on the surface of the catalyst. In this context, we found recently that the addition of NaNO 2 in the hydrogenation of toluidines results in an increased rate, most likely due to formation of an adduct of nitrite and aromatic amine on the catalyst surface. , …”

Section: Resultsmentioning

confidence: 96%

Concurrent Hydrogenation of Aromatic and Nitro Groups over Carbon-Supported Ruthenium Catalysts

et al. 2014

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The concurrent hydrogenation of aromatic and nitro-groups poses particular challenges due to the highly differing adsorption strength of the two chemical moieties on the surface of metal catalysts. Studying the hydrogenation of nitrobenzene as model reaction, catalysts of ruthenium supported on carbon nanotubes (Ru/CNT) provided an ideal compromise allowing for both hydrogenation of the aromatic ring and the nitro-group. The use of methyl-labeled substrates enabled tracking the pathway of specific substrates and obtaining insight into the relative rates for the hydrogenation of nitrobenzene and intermediates. Together with findings on the co-adsorption of nitrobenzene and aniline on the Ru/CNT catalyst, an advanced mechanistic model for the hydrogenation of nitrobenzene emerges.

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Section: Resultsmentioning

confidence: 96%

Concurrent Hydrogenation of Aromatic and Nitro Groups over Carbon-Supported Ruthenium Catalysts

et al. 2014

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Section: Introductionmentioning

confidence: 99%

“…Precious metal catalysts such as Ir, Pd, − Ru, ,− and Rh were mainly used for the synthesis of alicyclic amines from aromatic amines, while Ni catalysts − were also reported. Precious metal catalysts usually possessed high activity for the hydrogenation of aromatic amines as well as the high selectivity to primary amines. ,− However, the high price of precious metals restricted their applications. In contrast, the Ni catalysts were usually less active than the precious metals and exhibited low selectivity to the primary amines. , In industry, Co/CaCO 3 was applied for the hydrogenation of aniline to cyclohexamine.…”

Section: Introductionmentioning

confidence: 99%

Highly Loaded and Dispersed Cobalt Catalysts for the Hydrogenation of Toluene with Triethylamine

Zuo

Yang

Chang

et al. 2019

Ind. Eng. Chem. Res.

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Highly dispersed and loaded (60 wt %) catalysts Co/MgAlO, Co/MgO, and Co/Al 2 O 3 were prepared for the hydrogenation of toluene without and with triethylamine (TEA). It was found that while Al 2 O 3 favored the dispersion of Co, MgO promoted the reduction of CoO x so that the Co/MgAlO exhibited the small Co particles (∼6.5 nm), high H 2 uptake (363 μmol/g), and thus was highly active for the hydrogenation reaction without TEA (not only higher than the Co/Al 2 O 3 and Co/ MgO but also higher than the 60% Ni/MgAlO). In addition, the adsorption heat of TEA was significantly lower on the Co/ MgAlO than on the Ni/MgAlO so that the reaction activity for the hydrogenation of toluene was significantly less affected by TEA on the Co/MgAlO than on the Ni/MgAlO. Thus, the Co/MgAlO can be expected to be better than the Ni/MgAlO for the synthesis of alicyclic amines from aromatic amines.

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“…Precious metal catalysts such as Pt, − Pd, ,, Ru, ,− and Rh ,− were mainly studied for the reactions. Co and Ni catalysts were also reported − for the reactions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ethylamines on the Hydrogenation of Toluene over Supported Nickel Catalysts

Zuo

Chang

et al. 2018

Ind. Eng. Chem. Res.

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Highly loaded and dispersed catalysts 60%Ni/Al2O3, 60%Ni/MgO, and 60%Ni/MgAlO were used to study the effect of monoethylamine (MEA), diethylamine (DEA), and triethylamine (TEA) on the hydrogenation of toluene. It was found that the heats and coverages for the adsorption of toluene and hydrogen decreased greatly after the preadsorption of an ethylamine, and thus the existence of ethylamines inhibited significantly the conversion of toluene on Ni. However, such effect was weakened over Ni supported on the basic supports (MgAlO and MgO). In addition, all the three ethylamines were strongly adsorbed on Ni, but with different coverages of MEA > DEA > TEA, which was the same sequence as the effect of ethylamines on the hydrogenation of toluene. Particularly, the Ni/MgAlO was the most active among the catalysts studied for the hydrogenation of toluene with ethylamines and thus might be a good choice for the hydrogenation of aromatic rings in aromatic amines.

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Ru-catalyzed hydrogenation of aromatic diamines: The effect of alkali metal salts

Cited by 14 publications

References 8 publications

Concurrent Hydrogenation of Aromatic and Nitro Groups over Carbon-Supported Ruthenium Catalysts

Concurrent Hydrogenation of Aromatic and Nitro Groups over Carbon-Supported Ruthenium Catalysts

Highly Loaded and Dispersed Cobalt Catalysts for the Hydrogenation of Toluene with Triethylamine

Effect of Ethylamines on the Hydrogenation of Toluene over Supported Nickel Catalysts

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