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Metal–organic frameworks as selectivity regulators for hydrogenation reactions
Summary：
The authors from the Chinese Academy of Sciences developed a MIL-101-based material with enhanced selectivity for hydrogenation reactions, achieving significant improvements in the field of catalysis.
Background：
1. To address the challenge of selectively hydrogenating α,β-unsaturated aldehydes to produce unsaturated alcohols, previous researchers explored various catalysts, achieving some success but facing limitations due to the thermodynamic favorability of C=C hydrogenation over C=O hydrogenation.
2. The authors in this study proposed an innovative method using metal-organic frameworks (MOFs) to encapsulate platinum nanoparticles, resulting in enhanced selectivity and conversion efficiency for the hydrogenation of α,β-unsaturated aldehydes.
Research Content：
1.Synthesis:
The authors synthesized MIL-101-based catalysts by encapsulating platinum nanoparticles between an inner core and an outer shell of MIL-101, using Fe3+ or Cr3+ metal nodes and 1,4-benzenedicarboxylate (BDC) linkers.
2.Characterizations:
-BET and Pore Size Distribution: MIL-101 exhibited characteristic pore windows of about 1.3 nm and 1.5 nm.
-SEM/TEM Tests: The particle size of the Pt nanoparticles was 2.8 nm, encapsulated uniformly within the MIL-101 layers.
-Other Tests: XPS measurements revealed electron transfer effects between Pt nanoparticles and MIL-101(Fe), affecting catalytic activity.
3.Application:
The material was tested for the selective hydrogenation of α,β-unsaturated aldehydes, achieving high selectivity (up to 95.6%) and conversion efficiency (up to 99.8%).
4.Mechanism:
Theoretical calculations indicated that the CUSs in MIL-101 preferentially interact with the C=O group, making its hydrogenation thermodynamically favored. This interaction lowers the reaction energy barrier, enhancing selectivity.
Outlook：
This research significantly advances the field of catalysis by demonstrating the potential of MOFs as selective regulators for hydrogenation reactions, opening new avenues for developing efficient and selective catalysts.
Metal–organic frameworks as selectivity regulators for hydrogenation reactions
Authors: Meiting Zhao, Kuo Yuan, Yun Wang, Guodong Li, Jun Guo, Lin Gu, Wenping Hu, Huijun Zhao, Zhiyong Tang
DOI: 10.1038/nature19763
Link: https://www.nature.com/articles/nature19763
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