Organometallic Ruthenium Nanoparticles as Model Catalysts for CO Hydrogenation: A Nuclear Magnetic Resonance and Ambient-Pressure X-ray Photoelectron Spectroscopy Study

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• 作者：Luis M. Mart铆nez-Prieto ; Sophie Carenco ; Cheng H. Wu ; Eric Bonnefille ; Stephanus Axnanda ; Zhi Liu ; Pier F. Fazzini ; Karine Philippot ; Miquel Salmeron ; Bruno Chaudret
• 刊名：ACS Catalysis
• 出版年：2014
• 出版时间：September 5, 2014
• 年：2014
• 卷：4
• 期：9
• 页码：3160-3168
• 全文大小：457K
• ISSN：2155-5435

文摘

We present a study of the structure and reactivity of Ru nanoparticles of different sizes (1.3, 1.9, and 3.1 nm) for CO hydrogenation using gas-phase nuclear magnetic resonance and mass spectroscopy. In addition, the nanoparticles were characterized under reaction mixtures in situ by ambient-pressure X-ray photoelectron spectroscopy. We found that during reaction the Ru is in the metallic state and that the diphosphine ligands [bis(diphenylphosphino)butane (dppb)] on the surface of 1.9 and 3.1 nm nanoparticles not only act as capping and protecting agents but also stay on the surface during reaction and improve their activity and selectivity toward C₂鈥揅₄ hydrocarbons.

Keywords:

ruthenium nanoparticles; model Fischer鈭扵ropsch synthesis; surface chemistry; ligand effect; ambient-pressure XPS; NMR; FTIR; mass spectrometry