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. 2019 Nov 2;12(21):3602. doi: 10.3390/ma12213602

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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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Statistics of publications between 2000 and 2018. (a) Approximate number of publications on green catalysts, (b) Approximate number of publications on metal nanoparticles, (c) Approximate number of publications on nanocatalysts, (d) Approximate percentage of publications on green catalysts. Source: Web of Science.