Fast and Selective Semihydrogenation of Alkynes by Palladium Nanoparticles Sandwiched in Metal-Organic Frameworks

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Choe, Kwanghak
Zheng, Fengbin
Wang, Hui
Yuan, Yi
Zhao, Wenshi
Xue, Guangxin
Qiu, Xueying
Ri, Myonghak
Shi, Xinghua
Wang, Yinglong
Li, Guodong
Tang, Zhiyong
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2020
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Abstract

The semihydrogenation of alkynes into alkenes rather than alkanes is of great importance in the chemical industry. Unfortunately, state‐of‐the‐art heterogeneous catalysts hardly achieve high turnover frequencies (TOFs) simultaneously with almost full conversion, excellent selectivity, and good stability. Here, we used metal–organic frameworks (MOFs) containing Zr metal nodes (“UiO”) with tunable wettability and electron‐withdrawing ability as activity accelerators for the semihydrogenation of alkynes catalyzed by sandwiched palladium nanoparticles (Pd NPs). Impressively, the porous hydrophobic UiO support not only leads to an enrichment of phenylacetylene around the Pd NPs but also renders the Pd surfaces more electron‐deficient, which leads to a remarkable catalysis performance, including an exceptionally high TOF of 13835 h−1, 100 % phenylacetylene conversion 93.1 % selectivity towards styrene, and no activity decay after successive catalytic cycles. The strategy of using molecularly tailored supports is universal for boosting the selective semihydrogenation of various terminal and internal alkynes.

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Angewandte Chemie, International Edition

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59

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9

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Chemical sciences

Science & Technology

Physical Sciences

Chemistry, Multidisciplinary

alkynes

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Choe, K; Zheng, F; Wang, H; Yuan, Y; Zhao, W; Xue, G; Qiu, X; Ri, M; Shi, X; Wang, Y; Li, G; Tang, Z, Fast and Selective Semihydrogenation of Alkynes by Palladium Nanoparticles Sandwiched in Metal-Organic Frameworks, Angewandte Chemie, International Edition, 2020, 59 (9), pp. 3650-3657

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