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. 2025 May 9;16:4322. doi: 10.1038/s41467-025-59688-0

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© The Author(s) 2025

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by-nc-nd/4.0/.

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Fig. 6 — a Conversion of model PU-1 using CeO₂ via the hydrogenation pathway, with separate reactions performed for different durations. Reaction conditions: PU-1 (250 mg), CeO₂ (25 mg), H₂ (10 bar), 200 °C. b Conversion of commercial PU products using CeO₂ via both hydrogenation and transfer hydrogenation pathways. Reaction conditions: PU (500 mg), CeO₂ (50 mg), H₂ (10 bar), 200 °C, 8 hours for the hydrogenation pathway, and EtOH (5 mL), 160 °C (thermoplastic PU), 180 °C (rigid PU foam), 14 hours for the transfer hydrogenation pathway. Full data of the reactions of (a) and (b) are available in Supplementary Tables 13 and 15, respectively.