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. 2023 Jun 21;13(13):1901. doi: 10.3390/nano13131901

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© 2023 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 (https://creativecommons.org/licenses/by/4.0/).

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Catalytic performance of ZnAl₂O₄-550 and ZnAl₂O₄-650 catalysts in the glycerolysis of urea (A), and the relationship between the number of acidic sites vs. GC yield and the number of basic sites vs. (2) selectivity (B).