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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
Published on: October 18, 2019
Linear alkane C-C bond chemistry mediated by metal surfaces
Zeying Cai1, Meizhuang Liu1, Limin She1
1School of Physics and Engineering and State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Xingang Xi Road 135, 510275 Guangzhou (China).
Substrate material dictates alkane C-C bond chemistry on metal surfaces. Gold surfaces promote alkane polymerization, while platinum surfaces lead to fragmentation via pyrolysis.
Area of Science:
- Surface Science
- Catalysis
- Computational Chemistry
Background:
- Anisotropic metal surfaces exhibit unique reactivity towards linear alkanes.
- The C-C bond chemistry of alkanes is sensitive to substrate material and surface reconstruction.
Purpose of the Study:
- To investigate the differing thermal activation of C-C bond chemistry in linear alkanes on Au(110) and Pt(110) surfaces.
- To elucidate the mechanisms governing selective dehydrogenation, coupling, and dissociation on these anisotropic surfaces.
Main Methods:
- Utilized Density Functional Theory (DFT) calculations.
- Analyzed reaction pathways for alkane dehydrogenation and C-C bond transformations.
- Investigated the role of surface reconstruction (missing-row) on Au(110) and Pt(110).
Main Results:
- Au(110) surfaces facilitate selective alkane dehydrogenation and C-C coupling (polymerization) due to favorable reaction energetics.
- Pt(110) surfaces promote dehydrogenative pyrolysis, leading to hydrocarbon fragmentation, driven by stronger C-Pt bonds.
- Dehydrogenation on Au(110) is endothermic, but subsequent C-C coupling is exothermic, favoring polymerization.
Conclusions:
- The choice of metal substrate (Au vs. Pt) critically controls the outcome of alkane thermal activation on (110) surfaces.
- Surface-mediated C-C bond chemistry is highly dependent on the balance between dehydrogenation and C-C bond cleavage/formation energetics.
- DFT provides crucial insights into the mechanistic differences driving polymerization versus pyrolysis.
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