High-Pressure Catalytic Reactions of C6 Hydrocarbons on Platinum Single-Crystals and Nanoparticles: A Sum Frequency Generational Vibrational Spectroscopic and Kinetic Study

摘要

Catalytic reactions of cyclohexene, benzene, n-hexane, 2-methylpentane, 3- methylpentane, and 1-hexene on platinum catalysts were monitored in situ via sum frequency generation (SFG) vibrational spectroscopy and gas chromatography (GC). SFG is a surface specific vibrational spectroscopic tool capable of monitoring submonolayer coverages under reaction conditions without gas-phase interference. SFG was used to identify the surface intermediates present during catalytic processes on Pt(111) and Pt(100) single-crystals and on cubic and cuboctahedra Pt nanoparticles in the Torr pressure regime and at high temperatures (300K - 450K).