Volume 133, Issue 41 pp. 22696-22702
Forschungsartikel

Polyoxometalate-Based Metal–Organic Framework as Molecular Sieve for Highly Selective Semi-Hydrogenation of Acetylene on Isolated Single Pd Atom Sites

Dr. Yiwei Liu

Dr. Yiwei Liu

Department of Chemistry, Tsinghua University, Beijing, 100084 China

Zhang Dayu School of Chemistry, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116024 China

Search for more papers by this author
Bingxue Wang

Bingxue Wang

School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100 China

Search for more papers by this author
Dr. Qiang Fu

Corresponding Author

Dr. Qiang Fu

School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100 China

Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026 China

Search for more papers by this author
Dr. Wei Liu

Dr. Wei Liu

State Key Laboratory of Fine Chemicals, Department of Chemistry, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024 China

Search for more papers by this author
Dr. Yu Wang

Dr. Yu Wang

Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800 China

Search for more papers by this author
Prof. Lin Gu

Prof. Lin Gu

Institute of Physics, Chinese Academy of Sciences, Beijing, 100190 China

Search for more papers by this author
Prof. Dingsheng Wang

Corresponding Author

Prof. Dingsheng Wang

Department of Chemistry, Tsinghua University, Beijing, 100084 China

Search for more papers by this author
Prof. Yadong Li

Corresponding Author

Prof. Yadong Li

Department of Chemistry, Tsinghua University, Beijing, 100084 China

Search for more papers by this author
First published: 09 August 2021
Citations: 10

Abstract

Achieving highly selective acetylene semi-hydrogenation in an ethylene-rich gas stream is of great industrial importance. Herein, we construct isolated single Pd atom in a polyoxometalate-based metal-organic framework (POMOF). The unique internal environment allows this POMOF to separate acetylene from acetylene/ethylene gas mixtures and confine it close to the single Pd atom. After semi-hydrogenation, the resulting ethylene is preferentially discharged from the pores, achieving a selectivity of 92.6 %. First-principles simulations reveal that the adsorbed acetylene/ethylene molecules form hydrogen bond networks with oxygen atoms of SiW12O404− and create dynamic confinement regions, which preferentially release the produced ethylene. Besides, at the Pd site, the over-hydrogenation of ethylene exhibits a higher reaction energy barrier than the semi-hydrogenation of acetylene. The combined advantages of POMOF and single Pd atom provides an effective approach for the regulation of semi-hydrogenation selectivity.

Conflict of interest

The authors declare no conflict of interest.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.