期刊
APPLIED CATALYSIS A-GENERAL
卷 458, 期 -, 页码 155-161出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2013.03.041
关键词
Doped carbon nanotubes; Aldol condensation; Decarboxylative condensation; Biomass upgrading; Pyridinic species; Ketonization
资金
- Spanish Ministry for Economy and Competitiveness [CTQ2011-29272-C04-01, CTQ2011-29272-C04-02, CTQ2011-29272-C04-03]
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. (c) 2013 Elsevier B.V. All rights reserved.
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