Selective hydrogenation of aldehyde groups in various α,β-unsaturated aldehydes over alumina-supported cobalt (0) catalyst

Ando, Chie; Kurokawa, Haruhisa; Miura, Hiroshi

doi:10.1016/s0926-860x(99)00142-8

Cited by 52 publications

(20 citation statements)

References 3 publications

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“…11 Conversion toward products versus total conversion for crotonaldehyde hydrogenation on AlNiCo1 (a), AlNiCo2 (b) and Raney nickel (c) Butanal , Butanol , Crotyl alcohol , Heavy products active than nickel in this hydrogenation reaction. As compared to the literature, we do not observe any impact of the presence of Co on the selectivity [35,36]. The preparation method used for the synthesis of QC compositions involves the manufacture of a true alloy between Ni and Co whereas conventional impregnated catalysts may not present such close combination of the two metals.…”

Section: Crotonaldehyde Hydrogenationsupporting

confidence: 45%

“…Thus, with a true alloy composition, no electronic effect which controls the adsorption mode of a, b-unsaturated aldehydes on the surface and which might favor the selectivity towards crotyl alcohol is observed. One can assume that the selectivity observed on Co based catalysts in previous studies originates from the contribution of segregated Co particles [35,36].…”

Section: Crotonaldehyde Hydrogenationmentioning

confidence: 99%

“…Addition of a small quantity of copper improves the selectivity for the C=O group hydrogenation and decreases the activity of catalysts [33,34]. Cobalt supported and cobalt doped Raney catalysts possess high potential for C=O group hydrogenation and much work has been done to improve catalytic activity and selectivity in forming unsaturated alcohol, such as addition of Pt [35], B [36,37] and Cl -or Br - [29].…”

Section: Introductionmentioning

confidence: 99%

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Quasicrystalline Structures as Catalyst Precursors for Hydrogenation Reactions

et al. 2009

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Section: Crotonaldehyde Hydrogenationsupporting

confidence: 45%

Section: Crotonaldehyde Hydrogenationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quasicrystalline Structures as Catalyst Precursors for Hydrogenation Reactions

et al. 2009

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“…Ethanol flow rate was 4.2 × 10 −8 mol/s. Cobalt has high selectivity to the unsaturated alcohol [7]. Then, 5 wt.% Co was deposited on Mg 2 Ni.…”

Section: Co/mg 2 Nimentioning

confidence: 99%

Selective hydrogenation of unsaturated aldehyde over hydrogen storage alloy

Yamada

Fujimura

Goto

2004

Journal of Alloys and Compounds

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“…Supported Co showed higher hydrogenation selectivity to UOL [7][8][9][10][11][12]. Nitta et al [7,8] found that the supported Co could efficiently and selectively hydrogenate the carbonyl group of UAL by employing Co loading as high as 40 wt%.…”

Section: Introductionmentioning

confidence: 99%

Selective Hydrogenation of trans-Cinnamaldehyde over SiO2-Supported Co?Ir Bimetallic Catalysts

et al. 2004

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Selective hydrogenation of trans-cinnamaldehyde was studied on SiO 2 -supported Co-Ir bimetallic catalysts. Addition of Ir to Co/SiO 2 increased the hydrogenation selectivity and activity of cinnamaldehyde to the corresponding cinnamyl alcohol (UOL). A selectivity as higher as 93% to UOL at ambient temperature under H 2 pressure of 2.0 MPa was obtained over catalyst with loadings of 10 wt% Co and 0.5 wt% Ir (Co 10:0 Ir 0:5 /SiO 2 ). The XRD, Raman and TPR results showed that the higher dispersed Co 3 O 4 particles were formed on SiO 2 due to the addition of Ir, which increased the reducibility of Co 3 O 4 to Co 0 . The reduction of oxidized Co-Ir/SiO 2 samples occurred at the temperatures with about 200 K lower than that of the one without Ir species as evidenced by the observations of TPR and in-situ Raman characterizations. The XPS results indicated that the large parts of Co 3 O 4 in the sample of Co-Ir/SiO 2 were reduced to Co 0 , but only small parts of that were reduced to Co 0 in the sample of Co/SiO 2 under flowing 5%H 2 /Ar at 673 K. The CO chemisorptions revealed that the irreversible uptakes of CO on the reduced Co-Ir/SiO 2 sample was much higher than those on the reduced Co/SiO 2 and Ir/SiO 2 , and also higher than the combination of that on the reduced Co/ SiO 2 and Ir/SiO 2 , respectively. The experimental data suggested that the presence of Ir played a key role in the reduction of Co 3 O 4 to Co 0 through a strong interaction between them and that the amount of Co 0 at the catalyst surfaces was correlated to the activity and more importantly to the UOL selectivity.

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Selective hydrogenation of aldehyde groups in various α,β-unsaturated aldehydes over alumina-supported cobalt (0) catalyst

Cited by 52 publications

References 3 publications

Quasicrystalline Structures as Catalyst Precursors for Hydrogenation Reactions

Quasicrystalline Structures as Catalyst Precursors for Hydrogenation Reactions

Selective hydrogenation of unsaturated aldehyde over hydrogen storage alloy

Selective Hydrogenation of trans-Cinnamaldehyde over SiO2-Supported Co?Ir Bimetallic Catalysts

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