A Laser-Activated Membrane Introduction Mass Spectrometry Study of Proton Spillover Promoted Alkane Dehydrogenation.
Ryan Yongtae KimHarry RiveraSara E EvartsJosé A Rodríguez-MartínezRichard R WillisDouglas B GallowayFalaah FalihMichael J McCallS Jackson SmithKyra PerzEugene S SmotkinPublished in: Analytical chemistry (2020)
Operando high-throughput evaluation of heterogeneous catalysts by laser-activated membrane introduction mass spectrometry (LAMIMS) elucidates the Pt loading dependence of methylcyclohexane dehydrogenation on platinized γ-alumina beads. A CO2 marking laser rapidly and sequentially heats catalyst beads positioned on a heat-dissipating carbon paper support that overlays a silicone membrane, separating the bead library reaction zone from a quadrupole mass analyzer. The toluene m/z peak varies logarithmically with Pt loading, suggesting that reactivity includes factors that are negatively correlated to Pt loading. These factors may include the Pt/γ-Al2O3 surface interfacial region as one component of a heterogeneous catalytically active surface area/mass. This work demonstrates LAMIMS as a broadly applicable high-throughput operando screening method for heterogeneous catalysts.
Keyphrases
- mass spectrometry
- high throughput
- liquid chromatography
- highly efficient
- gas chromatography
- high performance liquid chromatography
- high speed
- ionic liquid
- capillary electrophoresis
- high resolution
- tandem mass spectrometry
- metal organic framework
- single cell
- electron transfer
- room temperature
- simultaneous determination
- molecular dynamics simulations
- heat stress
- reduced graphene oxide
- gold nanoparticles