Effect of supports on the activity of nickel catalysts in acetonitrile hydrogenation

Gluhoi, Andreea C.; Mărginean, P.; Stänescu, Undina

doi:10.1016/j.apcata.2005.07.036

Cited by 37 publications

(19 citation statements)

References 36 publications

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“…Ni [41] and Pt [42] ) have also been reported. The p-CNB feed was introduced to the reactor as an alcohol solution and subsequently vaporised before contacting the catalyst.…”

Section: Resultsmentioning

confidence: 89%

Exclusive Production of Chloroaniline from Chloronitrobenzene over Au/TiO₂ and Au/Al₂O₃

2008

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The gas-phase continuous hydrogenation of p-chloronitrobenzene (p-CNB) over 1 mol% Au/TiO2 and Au/Al2O3 was compared for the first time. Both catalysts exhibit 100% selectivity in terms of -NO2 group reduction, resulting in the sole formation of p-chloroaniline (p-CAN). Au/TiO2 exhibited a narrower particle size (1-10 nm) distribution than Au/Al2O3 (1-20 nm) and a smaller surface-area-weighted mean Au size (6 nm versus 9 nm). Au/TiO2 delivered a higher specific hydrogenation rate (by a factor of up to four), a response that is discussed in terms of Au particle size and a possible contribution of the support to p-CNB activation. A CNB isomer reactivity sequence was established, that is, o> p> m, which is attributed to resonance stabilisation effects. The results presented establish a basis for the development of a sustainable alternative route for the production of haloamines.

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“…Ni [41] and Pt [42] ) have also been reported. The p-CNB feed was introduced to the reactor as an alcohol solution and subsequently vaporised before contacting the catalyst.…”

Section: Resultsmentioning

confidence: 89%

Exclusive Production of Chloroaniline from Chloronitrobenzene over Au/TiO₂ and Au/Al₂O₃

2008

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“…7a). This is significant given the temporal decline in activity reported in liquid 4 -7,9,54 -56 and gas phase 10,11,18,20 nitrile hydrogenation over supported Pd, 5 -7,9,55,56 Pt, 7,57 Ru, 7 and Ni. 11,19,20 Catalyst deactivation has been ascribed to metal particle agglomeration, 7,10 active site occlusion by amine product(s), 7,10,15,57,58 and catalyst coking associated with the formation of dehydrogenated surface species and carbides.…”

Section: Butyronitrile Hydrogenation: Thermodynamic Considerationsmentioning

confidence: 97%

“…1 requires catalyst bifunctionality 59 where the metal phase serves to promote hydrogenation (steps (I), (II), (IV), and (VI)) and condensation of the imine intermediates with butyl-(step (III)) and dibutyl-amine (step (V)) proceeds on surface acid sites. 2,4,18,19,59 Selectivity to the target butylamine was higher over Ba-Pd/SiO 2 ( Fig. 7c) than Pd/SiO 2 (Fig.…”

Section: Butyronitrile Hydrogenation: Thermodynamic Considerationsmentioning

confidence: 99%

Production of Butylamine in the Gas Phase Hydrogenation of Butyronitrile over Pd/SiO₂ and Ba-Pd/SiO₂

Hao

Cárdenas‐Lizana

et al. 2015

Catalysis, Structure & Reactivity

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The gas phase (1 atm, 473 -563 K) hydrogenation of butyronitrile has been studied over Pd/SiO 2 and Ba -Pd/SiO 2 . Catalysts characterization involved temperature-programmed reduction (TPR), H 2 /NH 3 chemisorption/temperature programmed desorption (TPD), X-ray diffraction (XRD), and TEM measurements. The incorporation of Ba with Pd resulted in the formation of smaller metal nano-particles (7 vs 28 nm) with a resultant (seven-fold) higher H 2 chemisorption and decreased total surface acidity (from NH 3 chemisorption/TPD).Temperature-related activity maxima were observed for both catalysts and are associated with thermal desorption of the nitrile reactant. Exclusivity to the target butylamine was achieved at T $ 543 K where Ba -Pd/SiO 2 delivered higher selective hydrogenation rate (91 mol h 21 mol Pd 21) than Pd/SiO 2 (54 mol h 21 mol Pd 21 ), attributed to greater availability of surface-reactive hydrogen. Lower surface acidity served to minimize condensation to higher amines. The rate and selectivity to butylamine exceed those previously reported for gas phase operation.

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“…Supported nickel catalysts have received extensive attentions due to their easy availability and reasonable cost compared to noble metals [1][2][3], as well as their predominant properties in hydrotreating, hydrogenation and decomposition reactions [4][5][6]. However, sintering and agglomeration of NiO often occur on c-Al 2 O 3 [7][8][9], which greatly decrease the catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Promotion Effects of La and Ce on Ni/γ-Al2O3 Catalysts in Hydrotreating of Crude 2-Ethylhexanol

Yang

et al. 2009

Catal Lett

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Promotion effects of La and Ce on Ni/c-Al 2 O 3 catalysts in hydrotreating of crude 2-ethylhexanol were studied. The results indicated that La was helpful to increase the content of octahedral Ni 2? ions while Ce had no such modification effect. Activity test indicated that catalysts modified by La exhibited higher activities compared with the unmodified and Ce modified catalysts. The sample modified with 1.5 wt% La presented the best activities in a wide range of space velocity from 1.5 to 12 h -1 .

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Effect of supports on the activity of nickel catalysts in acetonitrile hydrogenation

Cited by 37 publications

References 36 publications

Exclusive Production of Chloroaniline from Chloronitrobenzene over Au/TiO₂ and Au/Al₂O₃

Exclusive Production of Chloroaniline from Chloronitrobenzene over Au/TiO₂ and Au/Al₂O₃

Production of Butylamine in the Gas Phase Hydrogenation of Butyronitrile over Pd/SiO₂ and Ba-Pd/SiO₂

Promotion Effects of La and Ce on Ni/γ-Al2O3 Catalysts in Hydrotreating of Crude 2-Ethylhexanol

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Effect of supports on the activity of nickel catalysts in acetonitrile hydrogenation

Cited by 37 publications

References 36 publications

Exclusive Production of Chloroaniline from Chloronitrobenzene over Au/TiO2 and Au/Al2O3

Exclusive Production of Chloroaniline from Chloronitrobenzene over Au/TiO2 and Au/Al2O3

Production of Butylamine in the Gas Phase Hydrogenation of Butyronitrile over Pd/SiO2 and Ba-Pd/SiO2

Promotion Effects of La and Ce on Ni/γ-Al2O3 Catalysts in Hydrotreating of Crude 2-Ethylhexanol

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Product

Resources

About

Exclusive Production of Chloroaniline from Chloronitrobenzene over Au/TiO₂ and Au/Al₂O₃

Exclusive Production of Chloroaniline from Chloronitrobenzene over Au/TiO₂ and Au/Al₂O₃

Production of Butylamine in the Gas Phase Hydrogenation of Butyronitrile over Pd/SiO₂ and Ba-Pd/SiO₂