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Kim, Ryan Yongtae; Rivera, Harry; Evarts, Sara E; Rodríguez-Martínez, José A; Willis, Richard R; Galloway, Douglas B; Falih, Falaah; McCall, Michael J; Smith, S. Jackson; Perz, Kyra; Smotkin, Eugene S
Analytical chemistry (Washington), 10/2020, Volume: 92, Issue: 19Journal Article
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.
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