A re-useable microreactor for dynamic and sensitive photocatalytic measurements: Exemplified by the photoconversion of ethanol on Pt-loaded titania P25

Author:

Aletsee Clara C.1ORCID,Hochfilzer Degenhart2ORCID,Kwiatkowski Anika3ORCID,Becherer Markus3ORCID,Kibsgaard Jakob2ORCID,Chorkendorff Ib2ORCID,Tschurl Martin1ORCID,Heiz Ueli1ORCID

Affiliation:

1. Chair of Physical Chemistry, TUM School of Natural Sciences and Catalysis Research Center, Technische Universität München 1 , Lichtenbergstr. 4, 85748 Garching, Germany

2. SurfCat Section for Surface Physics and Catalysis, Department of Physics, Technical University of Denmark 2 , 2800 Kgs Lyngby, Denmark

3. ZEITlab, TUM School of Computation, Information and Technology, Technische Universität München 3 , Hans-Piloty-Str. 1, 85748 Garching, Germany

Abstract

Despite numerous advancements in synthesizing photoactive materials, the evaluation of their catalytic performance remains challenging since their fabrication often involves tedious strategies, yielding only low quantities in the μ-gram scale. In addition, these model catalysts exhibit different forms, such as powders or film(-like) structures grown on various supporting materials. Herein, we present a versatile gas phase μ-photoreactor, compatible with different catalyst morphologies, which is, in contrast to existing systems, re-openable and –useable, allowing not only post-characterization of the photocatalytic material but also enabling catalyst screening studies in short experimental time intervals. Sensitive and time-resolved reaction monitoring at ambient pressure is realized by a lid-integrated capillary, transmitting the entire gas flow from the reactor chamber to a quadrupole mass spectrometer. Due to the microfabrication of the lid from borosilicate as base material, 88% of the geometrical area can be illuminated by a light source, further enhancing sensitivity. Gas dependent flow rates through the capillary were experimentally determined to be 1015–1016 molecules s−1, and in combination with a reactor volume of 10.5 μl, this results in residence times below 40 s. Furthermore, the reactor volume can easily be altered by adjusting the height of the polymeric sealing material. The successful operation of the reactor is demonstrated by selective ethanol oxidation over Pt-loaded TiO2 (P25), which serves to exemplify product analysis from dark-illumination difference spectra.

Funder

Deutsche Forschungsgemeinschaft

TUM-IAS

Studienstiftung des Deutschen Volkes

Publisher

AIP Publishing

Subject

Instrumentation

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