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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/).
H2-temperature programmed reduction (TPR) profiles of the catalysts. Reaction conditions: purging the catalysts with N2 at 110 °C; programmed temperature reduction with H2 at 50–600 °C, the heating rate is 5 °C/min.