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O: Fachverband Oberflächenphysik

O 102: Heterogeneous Catalysis on Metals

O 102.7: Vortrag

Donnerstag, 19. März 2020, 12:15–12:30, TRE Phy

Ligand-Induced Heterogeneous Catalysis: Selective Hydrogenation of Acrolein on Ligand-Modified Pd(111) — •Carsten Schröder, Marvin C. Schmidt, and Swetlana Schauermann — Physikalische Chemie, CAU Kiel, Max-Eyth-Str. 2, 24118 Kiel

A major challenge in heterogeneous catalysis is obtaining control over selectivity in multi-pathway transformations of hydrocarbons. Recently, a new approach was introduced, which is based on employing catalytic surfaces functionalized with organic ligands. The intermolecular interactions between the reactants and the co-adsorbed ligand species were shown to be capable of promoting the desired reaction pathway. In our recent studies, on acrolein hydrogenation over Pd, almost 100% selectivity in the formation of the target product unsaturated alcohol propenol was detected, which arises from the presence of the oxopropyl-ligand species formed at the initial stages of reaction. In this contribution, we present a mechanistic study on hydrogenation of acrolein over ligand-modified Pd(111) surface. We employ a combination of infrared reflection adsorption spectroscopy and scanning tunneling microscopy along with the molecular beam techniques to obtain detailed information on the mechanisms and kinetics of acrolein partial hydrogenation to propenol. First experiments show, that the induction period of the formation of propenol, which is typically observed for acrolein hydrogenation, can be significantly reduced by precovering the surface with 2-methyl-2-pentenal as a ligand. Spectroscopic observations suggest fast formation of the desired reaction intermediate - propenoxy-species - on the ligand-modified surface.