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1 article(s) from Pecheu Nkepdep, Chancellin

Gold nanoparticle-decorated reduced graphene oxide as a highly effective catalyst for the selective α,β-dehydrogenation of N-alkyl-4-piperidones

Brenda Flore Kenyim,
Mihir Tzalis,
Marilyn Kaul,
Robert Oestreich,
Aysenur Limon,
Chancellin Pecheu Nkepdep and
Christoph Janiak

Beilstein J. Nanotechnol. 2026, 17, 218–238, doi:10.3762/bjnano.17.15

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Figure 1: Schematic representation of the carbon-supported gold catalyst preparation through the reduction-de...

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Figure 2: SEM images (10 µm scale) of (a) AC, (b) rGO, and (c) CB.

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Figure 3: Nitrogen sorption isotherms of the three carbon materials at 77 K (filled symbols: adsorption, empt...

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Figure 4: (a) Localized surface plasmon resonance absorption band of AuNPs present in the dispersion (Au-Cit)...

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Figure 5: TEM images of (a) Au-Cit/AC, (b) Au-Cit/rGO, and (c) Au-Cit/CB, with the inserts showing a wider ar...

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Figure 6: (a) Plasmon resonance absorption band of AuNPs present in the dispersion (Au-SiW₉) and the spectra ...

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Figure 7: TEM images of (a) Au-SiW₉/AC, (b) Au-SiW₉/rGO, and (c) Au-SiW₉/CB with the inserts showing a wider ...

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Figure 8: (a, b) TEM images of Au@SiW₉/rGO at two different magnifications and (c) the corresponding particle...

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Figure 9: PXRD patterns of crystalline gold nanoparticles deposited on rGO.

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Figure 10: Nitrogen sorption isotherms of the AuNP/rGO composites at 77 K (filled symbols: adsorption, empty s...

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Figure 11: Deconvoluted XPS spectra of the (a) Au 4f, (b) C 1s, (c) W 4f, and (d) O 1s regions of the Au-SiW₉/...

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Scheme 1: α,β-oxidative dehydrogenation of N-methyl-, N-ethyl-, and N-benzyl-4-piperidone to N-alkyl-2,3-dihy...

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Figure 12: (a) Turnover number (TON) and turnover frequency (TOF) of the rGO-based catalysts measured in one h...

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Figure 13: Catalytic stability test for the rGO-based catalysts.

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Figure 14: Possible reaction pathways for AuNPs/rGO-catalyzed aerobic oxidative α,β-dehydrogenation.

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Figure 15: Leaching test of the Au–SiW₉/rGO catalyst.

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Figure 16: TEM analysis of the Au–SiW₉/rGO catalyst over three consecutive catalytic runs: (a) fresh catalyst,...

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Published 30 Jan 2026

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