Chemoselective hydrogenation of aromatic aldehydes over SiO2 modified Co/γ-Al2O3

Kong, Xiangjin; Chen, Ligong

doi:10.1016/j.apcata.2014.02.011

Cited by 29 publications

(14 citation statements)

References 33 publications

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“…[42] Moreover, three peaks werel ocated at 2q = 44.2, 51.5, and 76.08 in the patterns of Co-NSPC-T (T = 550, 700, 850, 1000 8C), which were indexed to the (111), (200), and (220) planeso ff ace-centered cubic (fcc)-phase Co nanoparticles, respectively. [41,43,44] These results illustrated that increasing temperatures facilitated the growth and agglomeration of Co NPs with ascending intensity and declining half-peak width, which was in line with the TEM results. Furthermore, the two weak peaks at 41.5 and 47.48 in the XRD patternso fC o-NSPC-T( T = 550, 700, 850 8C) were assigned to e-structure Co. [45] Owing to the metastabilityo fe-structure Co, no e-structure Co was observed in Co-NSPC-1000.…”

Section: Resultssupporting

confidence: 87%

“…The sharp peaks were assigned to the (002) plane of graphite, indicating the development of graphitic domains on an amorphous carbon matrix . Moreover, three peaks were located at 2 θ =44.2, 51.5, and 76.0° in the patterns of Co‐NSPC‐T ( T =550, 700, 850, 1000 °C), which were indexed to the (111), (200), and (220) planes of face‐centered cubic (fcc)‐phase Co nanoparticles, respectively . These results illustrated that increasing temperatures facilitated the growth and agglomeration of Co NPs with ascending intensity and declining half‐peak width, which was in line with the TEM results.…”

Section: Resultsmentioning

confidence: 99%

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Cobalt Entrapped in N,S‐Codoped Porous Carbon: Catalysts for Transfer Hydrogenation with Formic Acid

et al. 2019

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Catalysts with Co nanoparticles (NPs) entrapped in N,S‐codoped carbon shells were successfully fabricated by pyrolysis of porous organic polymers (POPs) with cobalt salts. The encapsulated structure consisting of Co NPs and N,S‐codoped carbon layers was verified by TEM, XRD, and X‐ray photoelectron spectroscopy. The catalysts displayed excellent activity and stability for the catalytic transfer hydrogenation (CTH) of nitrobenzene with formic acid under base‐free conditions. Furthermore, the resultant catalysts allowed for highly efficient and selective transfer hydrogenation of various functionalized nitroarenes to the corresponding anilines. Through control experiments, the covered Co NPs were identified as active sites for CTH. The incorporation of S into the N‐doped carbon lattice promoted the electron transfer from metallic cobalt NPs to their shells, which played a significant role in the acceleration of CTH. Moreover, the Co‐NSPC‐850 catalyst pyrolyzed at 850 °C showed excellent stability in the recycling experiments.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Cobalt Entrapped in N,S‐Codoped Porous Carbon: Catalysts for Transfer Hydrogenation with Formic Acid

et al. 2019

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“…In the amplified XRD patterns from 40°to 50°, the weak peaks at 44.1°were observed in all four samples, which indexed to the (111) plane of Co (PDF no. 15-0806), 26,64 in accord with the TEM images. Moreover, this extremely low peak was attributed to the ultrasmall size of Co NPs and the low Co content, which was confirmed by TEM and ICP-OES.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

N,S-Codoped Carbon Shells Embedded with Ultrafine Co NPs for Reductive Amination with Formic Acid

Guo

Wang

Qiu

et al. 2019

ACS Sustainable Chem. Eng.

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Herein, N,S-codoped carbon materials embedded with ultrafine and well-distributed Co nanoparticles (1.14 wt % Co) were prepared through pyrolysis of the hybrids of SNW-1 and Co(Ac) 2 coated with glucose. It was observed by TEM and XRD that Co nanoparticles (NPs) were entrapped in doped carbon shells uniformly. The glucose coating presented a significant impact on the size distribution of Co NPs and doped modes of heteroatoms, especially the S species. The catalyst displayed outstanding activity for catalytic transfer hydrogenation (CTH) with formic acid under the base-free system. Encouragingly, diverse secondary amines were produced in excellent yields through the domino reaction of hydrogenation and reductive amination. Remarkably, the catalyst with ultrafine Co NPs showed good durability under harsh reaction conditions and displayed no significant loss in both activity and selectivity in 5 runs. This was attributed to the protection of constructed N,S dual-doped carbon shells. Hence, we offer an alternative strategy for the construction of dualdoped carbon materials trapped with ultrafine transition metal, which can be further applied in various catalytic processes.

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“…10,19,20,22,[27][28][29][30][31][32][33][34][35][36][37][38] A successful strategy is to control the catalytic performance of supported metal catalysts by tuning the support acidity of low-cost and naturally-abundant silica-alumina. 19,24,[39][40][41][42][43][44] By means of XPS 40,45 or in situ IR spectroscopy combined with CO adsorption, 19,46 it was shown that changing the support acidity can induce ionic effects on supported metal particles. Increasing the support acidity is assumed to withdraw electrons from supported metal particles and weaken the M-H bond on the surface, while decreasing the support acidity is expected to promote electron-rich metal particles and decrease their binding energy.…”

Section: Introductionmentioning

confidence: 99%

Influence of support acidity on the performance of size-confined Pt nanoparticles in the chemoselective hydrogenation of acetophenone

Wang

Kim

Zhou

et al. 2015

Catal. Sci. Technol.

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Chemoselective hydrogenation of aromatic aldehydes over SiO2 modified Co/γ-Al2O3

Cited by 29 publications

References 33 publications

Cobalt Entrapped in N,S‐Codoped Porous Carbon: Catalysts for Transfer Hydrogenation with Formic Acid

Cobalt Entrapped in N,S‐Codoped Porous Carbon: Catalysts for Transfer Hydrogenation with Formic Acid

N,S-Codoped Carbon Shells Embedded with Ultrafine Co NPs for Reductive Amination with Formic Acid

Influence of support acidity on the performance of size-confined Pt nanoparticles in the chemoselective hydrogenation of acetophenone

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