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Article

Continuous 2-Methyl-3-butyn-2-ol Selective Hydrogenation on Pd/γ-Al2O3 as a Green Pathway of Vitamin A Precursor Synthesis

1
Institute of Physical Chemistry, Polish Academy of Sciences, ul. Kasprzaka 44/52, 01-224 Warsaw, Poland
2
Materials Research Laboratory, Silesian University of Technology, Konarskiego 18A, 44-100 Gliwice, Poland
*
Author to whom correspondence should be addressed.
Academic Editors: Kei Manabe and Nicola Della Ca
Catalysts 2021, 11(4), 501; https://doi.org/10.3390/catal11040501
Received: 29 January 2021 / Revised: 12 April 2021 / Accepted: 12 April 2021 / Published: 15 April 2021
In this work, the effect of pretreatment conditions (10% H2/Ar flow rate 25 mL/min and 400 °C, 3 h or 600 °C, 17 h) on the catalytic performance of 1 wt.% Pd/γ-Al2O3 has been evaluated for hydrogenation of 2-methyl-3-butyn-2-ol in continuous-flow mode. Two palladium catalysts have been tested under different conditions of pressure and temperature and characterized using various physicochemical techniques. The catalytic performance of red(400 °C)-Pd/γ-Al2O3 and red(600 °C)-Pd/γ-Al2O3 are affected by the coexistence of several related factors like the competition between PdH and PdCx formation during the reaction, structure sensitivity, hydrogen spillover to the alumina support and presence or absence of Pd–Al species. High-temperature reduction leads to formation of Pd–Al species in addition to pure Pd. The Pd–Al species which reveal unique electronic properties by decreasing the Pdδ− surface concentration via electron transfer from Pd to Al, leading to a weaker Pd–Alkyl bonding, additionally assisted by the hydrogen spillover, are the sites of improved semi-hydrogenation of 2-methyl-3-butyn-2-ol towards 2-methyl-3-buten-2-ol (97%)—an important intermediate for vitamin A synthesis. View Full-Text
Keywords: heterogeneous catalysis; flow chemistry; selective hydrogenation; green chemistry heterogeneous catalysis; flow chemistry; selective hydrogenation; green chemistry
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MDPI and ACS Style

Fernández-Ropero, A.J.; Zawadzki, B.; Kowalewski, E.; Pieta, I.S.; Krawczyk, M.; Matus, K.; Lisovytskiy, D.; Śrębowata, A. Continuous 2-Methyl-3-butyn-2-ol Selective Hydrogenation on Pd/γ-Al2O3 as a Green Pathway of Vitamin A Precursor Synthesis. Catalysts 2021, 11, 501. https://doi.org/10.3390/catal11040501

AMA Style

Fernández-Ropero AJ, Zawadzki B, Kowalewski E, Pieta IS, Krawczyk M, Matus K, Lisovytskiy D, Śrębowata A. Continuous 2-Methyl-3-butyn-2-ol Selective Hydrogenation on Pd/γ-Al2O3 as a Green Pathway of Vitamin A Precursor Synthesis. Catalysts. 2021; 11(4):501. https://doi.org/10.3390/catal11040501

Chicago/Turabian Style

Fernández-Ropero, Antonio J., Bartosz Zawadzki, Emil Kowalewski, Izabela S. Pieta, Mirosław Krawczyk, Krzysztof Matus, Dmytro Lisovytskiy, and Anna Śrębowata. 2021. "Continuous 2-Methyl-3-butyn-2-ol Selective Hydrogenation on Pd/γ-Al2O3 as a Green Pathway of Vitamin A Precursor Synthesis" Catalysts 11, no. 4: 501. https://doi.org/10.3390/catal11040501

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