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A single atom has a huge specific surface area and a very high atom utilization rate, so it has great application prospects in the field of catalysis
.
Because single atoms have extremely large surface energy, in order to inhibit the aggregation of single atoms into clusters, it has become a hot spot in the field of catalysis to explore suitable substrates to support single atoms to form heterogeneous catalysts
Recently, Li Jia's team from the Shenzhen International Graduate School of Tsinghua University and Wang Dingsheng's team from the Department of Chemistry of Tsinghua University have explored a new type of single-atom catalyst system that can be used for the diboration of phenylacetylene
.
The system uses polyoxometalates (POMs) to stabilize dispersed monoatomic platinum, and uses three-dimensional metal organic frameworks (MOFs) as a limited space framework to fix polyoxometalates containing monoatomic platinum, thereby realizing monoatomic platinum The high dispersibility and high stability
Schematic diagram of preparation of different platinum nanomaterials (dispersed platinum nanoparticles, platinum single atoms and fixed nanoparticles, platinum single atoms)
During the research of Pt1-PMo@MIL-101 type heterogeneous catalyst, Li Jia’s team found that the quasi-planar coordination environment of platinum atoms is the key to determining its catalytic activity
.
In a standard tetragonal plane field, the d orbitals of Pt atoms are split into dxz(dyz), dz2, dxy, and dx2-y2 orbitals.
In terms of catalytic performance of phenylacetylene diboration, the co-workers found that the conversion rate of the monoatomic Pt1-PMo@MIL-101 catalyst is about 7 times that of the nanoparticle NPs@MIL-101 catalyst
.
Li Jia’s team used first-principles to study the phenylacetylene diboration process of platinum monoatomic catalysts and platinum nanocluster catalysts and discovered that platinum monoatomic catalysts and platinum nanoparticle catalysts adsorbed Bpin2 molecules and acetylene bond diboron The process of transformation has a promoting effect
The related achievement recently is "Preparation of polyoxometalates to provide confined space for single atom stabilization to improve the activity of catalyzing double boronation of alkyne bonds" (Fabricating polyoxometalates-stabilized single-atom site catalysts in confined space with enhanced activity for alkynes diboration) The topic was published on "Nature Communications" (Nature Communications)
.
Associate Professor Li Jia from the International Graduate School of Tsinghua University, Associate Professor Wang Dingsheng and Academician Li Yadong from the Department of Chemistry of Tsinghua University are the corresponding authors of this article
Link to the paper: https://doi.
