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. 2019 Jun 23;9(6):910. doi: 10.3390/nano9060910

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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TEM images of NiO/NCNT catalysts with the pyridine to 3-(aminomethyl) pyridine volume ratios of (a) 5, (b) 3, (c) 1 and (d) 0; and (e) their toluene conversion vs. reaction temperatures against those of NiO/CNTs [46]. (adapted from [46], with permission from Elsevier, 2019).