Abstract
Nitrogen-containing carbon nanotubes (NCNT) were synthesized via catalytic chemical vapor deposition using a silica supported cobalt catalyst and acetonitrile or pyridine as carbon/nitrogen source. It was found that NCNT with homogeneous average diameters could be prepared from acetonitrile irrespective of the synthesis temperature while the average diameter changed drastically with increasing temperature (823 – 1123 K) when pyridine was used. The amount of nitrogen incorporated in the NCNT grown from acetonitrile decreased with increasing temperature while it remained constant for NCNT grown from pyridine for the tested temperature range. The NCNT exhibited base properties and displayed catalytic activity in the Knoevenagel condensation of benzaldehyde with ethylcyanoacetate to form ethyl-a-cyanocinnamate. The amount of pyridinic nitrogen in the sample seems to determine the activity of the NCNT.
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