Preparation of nitrogen-containing carbon nanotubes and study of their performance as basic catalysts

Authors:  Laura Faba, Yolanda A. Criado, Esteban Gallegos-Suárez, María Pérez-Cadenas, Eva Díaz, Inmaculada Rodríguez-Ramos, Antonio Guerrero-Ruiz, Salvador Ordóñez

Abstract:
Nitrogen-containing carbon nanotubes were prepared, characterized and used as catalysts for two reactions of interest in the biomass upgrading processes: acetone aldol and acetic acid decarboxylative condensations. N-CNT were synthesized in a fluidized bed reactor by catalytic chemical vapor decomposition of acetonitrile on iron-, cobalt- and nickel-supported catalysts. Ni-N-CNT catalyst exhibits the highest activity, attributed to the surface concentration of basic sites, particularly the pyridinic species detected by X-ray photoelectron spectra (XPS). Likewise, the selectivity toward the final products of the reaction pathway is related both to the strength of basic sites (Ni-N-CNT) and to the morphology and chemical environment of the active sites (Fe-N-CNT). Synthesized catalysts show high stability for acetone condensation, whereas for ketonic condensation the catalyst stability decreases, mainly due to acic–base interactions with the active sites.

Keywords:
Doped carbon nanotubes
Aldol condensation
Decarboxylative condensation
Biomass upgrading
Pyridinic species
Ketonization

Published in: Applied catalysis A: General  (Volume 458, Pages 1-206, 10 May 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Preparation of nitrogen-containing carbon nanotubes and study of their performance as basic catalysts

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