Mg-modified Al2O3 regulates the supported Pd with Pd0/Pd2+ ratio for 2-butyn-l-ol semi-hydrogenation performance. (15th June 2023)

• Record Type: Journal Article
• Authors: Song, Xin; Shao, Fangjun; Zhao, Zijiang; Li, Xiaonian; Wei, Zhongzhe; Wang, Jianguo
• Is Part Of: Chemical engineering science. Volume 274(2023)
• Publication Date: 2023-06-15
• Subjects: Semi-hydrogenation -- Supported catalysts -- Alkynol; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; Chemical engineering; Periodicals; Electronic journals; 660
• DOI: 10.1016/j.ces.2023.118609
• Languages: English
• ISSNs: 0009-2509

Abstract

Graphical abstract: Highlights: Mg-modified alumina-loaded Pd catalyst for selective hydrogenation of acetylenic alcohols using a support modification strategy. Pd0.5 /Mg1 @γ-Al2 O3 catalyst achieved 99 % conversion of 2-butyne-1-ol and 97 % selectivity of cis -2-buten-1-ol at 25 °C and 0.1 MPa. The selectivity of the acetylenic alcohol semi-hydrogenation reaction was regulated by adjusting the ratio of Pd 0 /Pd 2+ . The strategy of modulating the electronic structure of the active metal Pd by introducing metal modifications to the support can be extended to other alkyne semi-hydrogenation systems. Abstract: Precise regulation of reaction selectivity at high conversions is the key to non-terminated alkyne semi-hydrogenation. Herein, a support modification strategy was employed to incorporate trace amounts of Mg elements into alumina support. The modified support loaded Pd catalyst optimized the activity and selectivity of the non-terminated alkyne semi-hydrogenation reaction. The TEM and XRD characterization of the catalysts demonstrated the entry of Mg elements into the Al2 O3 lattice to achieve the modification of the support. For the 2-butyne-1-ol semi-hydrogenation reaction, the Pd0.5 /Mg1 @Al2 O3 catalyst showed 99 % conversion and 97 % selectivity of the cis product at hydrogen pressure of 0.1 MPa and 25 °C. The introduced Mg element changed the electronic structure of Pd nanoparticles in the catalyst. The precise regulation of the 2-butyne-1-ol semi-hydrogenation reaction was achieved by adjusting the ratio of Pd 0 to Pd 2+ using the synergistic effect of Pd 0 and Pd 2+ .