In-situ Spectroscopy

On both sites, our lab in the LL&M research building as well as in the Leibniz Institute of Catalysis (LIKAT), our group uses several different experimental setups to study reactions in situ which are of either scientific or industrial relevance in order to gain insight into the underlying reaction mechanisms.

Bruker TENSOR 27

Bruker TENSOR 27

A Bruker TENSOR 27 FTIR spectrometer equipped with an MCT detector with extralong hold time (24h) for the mid infrared region is used to perform in situ experiments on photocatalytic reactions such as the cleavage of water. These reactions are excited by a mercury vapor lamp emitting broad parts of the sunlight spectrum. Gases being generated or consumed during the proceeding reaction can be measured precisely quantitative by a gas burette manufactured by MesSen Nord.

Mechanistic and kinetic in situ studies on homogeneously catalyzed hydroformylations are subject to a collaboration with the Leibniz Institute of Catalysis (LIKAT, Prof. Börner, Dr. Selent). The commonly used semi-batch reactor is coupled to a Bruker TENSOR 27 FTIR spectrometer via a toothed rim micro pump serving to circulate the reaction mixture between the reactor itself and the transmission IR cell. From the FTIR spectra, catalyst species can be detected down to submillimolar concentrations. The setup is designed for pressures up to 50 bar. An automated sampling system for GC analysis allows for a parallel monitoring of organic educts and products.

A second instrumental setup at the LIKAT labs allows in situ spectroscopic investigations of further reactions of large industrial and technical importance such as hydrogenations, aminations and carbonylations.